JP5111702B2 - Color correction method and ID card creation system in ID card creation system - Google Patents

Description

【００９４】
但し、カメラ＃１に係るマトリクスＴは（２）式により演算され、同様にして、カメラＮｏ．＃２に係るマトリクスＳは（３）式により演算される。カメラ＃１のマトリクスクス要素はＲｏｉ、Ｇｏｉ、Ｂｏｉ（ｉ＝１〜ｍ，ｍ＝３）であり、カメラ＃２のマトリクス要素はＲｉ、Ｇｉ、Ｂｉ（ｉ＝１〜ｍ，ｍ＝３）である。
【００９５】
【数２】

【００９６】
従って、色補正変換マトリクスＡが求まれば、カメラ＃２のＲＧＢ値をＳｋとしたとき、カメラ＃１に近似されたＲＧＢ値Ｔｋは（４）式により演算することができる。
【００９７】
Ｔｋ＝ＡＳｋ・・・・・・（４）
但し、カメラ＃１に係るＲＧＢ値Ｔｋは（５）式であり、カメラ＃２に係るＲＧＢ値Ｓｋは（６）式で与えられる。
【００９８】
【数３】

【００９９】
この（４）〜（６）式を用いることによりステップＢ６で色補正ＬＵＴを修正するようになされる。
【０１００】
この例で高速に色補正変換するためにはリアルタイムにマトリクス計算を行うよりも、予め色補正ＬＵＴを作成して、この色補正ＬＵＴを補間演算する方法（色補正ＬＵＴ＋補間処理）が採られる。そこで、カメラ＃１及びカメラＮｏ．＃２に係るＲＧＢ値を適当な間隔を持って組み合わせ（例えば０，８，１６，２４，・・・２４８，２５５）、その値をステップＢ４に従って階調変換し、（４）式を用いて色補正変換をするようになされる。この結果をステップＢ４で用いた階調変換の逆変換をして戻すようにする。
【０１０１】
この入出力関係を記憶した色補正ＬＵＴと補間演算器によりカメラ＃２のＲＧＢ値をカメラ＃１のＲＧＢ値に近似させた色補正データを出力するようになされる。この際の補間演算には例えば特開昭５８−１２３２０２号公報に開示されている手法を用いることができる。また、マトリクス計算された結果は負になる場合があるが、この場合には「０」にクリッピングするとよい。
【０１０２】
これらの演算処理を用いることにより、カメラ＃ｉや照明環境の相違を吸収することができ、撮影場所や撮影ユニットによらずに安定して顔画像などの色再現をすることができる。色補正処理はユニット間で適用する場合に限られることはなく、ここで求めた相対算出マトリクスをプリンタ側の色補正ＬＵＴを結合して使用してもよい。従業者証プリンタ１６等で画像入力から調整された色をサーマルプリンタ等に出力するまでを１つのテーブルとすることができ、画像データ処理の高速化が図れる。
【０１０３】
なお、色票に関して白色、肌色及び青色の場合について説明したが、これに限られることはない。これらの合計ｍ＝３色で計算する場合に、一次従属となるときは、緑・マゼンタ方向の相対が大きく発生する場合がある。この場合は、緑又はマゼンタ方向の仮データを（２）式、（３）式に加えることにより、精度は若干低下するものの安定したマトリクス計算が可能となる。例えば、（Ｒ，Ｇ，Ｂ）＝（０，０．１，０）なるデータを（２）式、（３）式に加えて用いることにより、独立な関係が成立し、安定したマトリクス演算が可能となる。もちろん、色票作成コストアップを除外するならば、予め色票に緑色データを加えて置いてもよい。
【０１０４】
続いて、この従業者証発行システム１００で使用される交付申請書４０について説明する。図９に示す交付申請書４０は例えばＡ４サイズの上質紙から成る。その右上端には顔写真貼付領域Ｐ１が設けられ、従業者証申請者２０の顔画像写真が貼付される。この従業者証申請者２０の顔写真の貼付に関しては、申請書顔写真レス化が進んだときに、顔写真貼付領域Ｐ１を顔画像形成領域として機能するような工夫が施され、従業者証申請者２０の顔画像が印画できるようになる。
【０１０５】
例えば、顔画像形成領域Ｐ１を受像層により形成することで対処される。この受像層は昇華染料や拡散染料などの素材からなる。顔画像などはサーマルヘッドにより熱を加えてこれらの染料をトラップすることにより受像層に定着して形成する。
【０１０６】
この受像層の素材としては、ポリエステル樹脂、ポリ塩化ビニル樹脂、ポリビニルアセタール樹脂、ポリビニルブチラール樹脂、エポキシ樹脂、アクリル樹脂のような高分子材料が使用され得る。中でも、ポリエステル系樹脂が環境上からも、その使用が好ましい。受像層はこれらの樹脂を粉末にしてイソシアネート等の溶剤に溶かし、グラビアコータ等で塗布した後に乾燥させ、その溶剤を揮発させることにより形成する。もちろん、顔画像形成領域Ｐ１に受像層を設けることなく、交付申請書４０の顔画像形成領域Ｐ１に電子写真を直接形成するようにしてもよい。
【０１０７】
この交付申請書４０内には顔画像形成領域Ｐ１の他に「従業者証交付申請書」、「住所」、「氏名」、「生年月日」などを記載する欄や、手数料の証紙などを貼付する証紙貼付領域Ｐ２が設けられている。従って、顔写真の貼付制度から次世代型に制度が移行した場合には、従業者証申請者２０は顔写真を予め準備する必要はなく、交付申請書４０に必要事項を記載するだけで足りようになる。
【０１０８】
続いて、この従業者証発行システム１００で作成される従業者証３０について説明する。図１０に示す従業者証３０は例えば縦の長さが６ｃｍ程度で、横の長さが９ｃｍ程度で、厚みが０．５〜１．０ｍｍ程度を有しており、接着部材を除いて大きく分けるとカード基板３０Ａと、表面シートと、その表面を覆う保護シート５１と、裏面シートの４層構造を有している。
【０１０９】
このカード基板３０Ａの一方の面には図示しないが厚さ１００μｍ程度の表面シートが設けられる。この表面シートは印刷部材であり、予め図１０に示す表面の所定領域Ｐ３には画像表示情報が印刷される。画像表示情報は、例えば「○○○従業者証」、「氏名」、「発行日」・・・などである。この印刷部材には、当該従業者証申請者２０の顔画像を形成するための顔画像形成領域Ｐ４が設けられ、その顔画像形成領域Ｐ４は受像層を成している。この受像層については交付申請書４０の顔画像形成領域Ｐ１の受像層と同じ構成であるので、その説明を省略する。
【０１１０】
この表面シート上には透明な保護シート５１が設けられ、表面シート上を覆うように保護されている。表面シートと保護シート５１とは接着シートを介して張り合わされている。接着シートには、ホットメルト樹脂や、樹脂軟化点の温度が１００℃程度又はそれよりも少し高い温度の熱溶融樹脂をフィルム状に形成したものを使用する。
【０１１１】
このカード基板の他方の面には、厚さ１００μｍ程度の裏面シートが設けられ、ペンで書ける筆記層を有している。筆記層はポリエステルエマルジョンに炭酸カルシウム及びシリカ微粒子を拡散したものである。筆記層は表面シートの受像層と同様にして、上述の素材を溶剤で溶かしてグラビアコータ等で塗布してから乾燥させて溶剤を気化することにより形成される。なお、従業者証３０に関してはＩＣチップを内蔵した電子カードにも適用される。
【０１１２】
続いて、この従業者証発行システム１００の従業者証プリンタ１６（特許請求の範囲においてはカード作成手段に対応する）について説明する。この例では１枚の従業者証用の生カード基板３０’に枚葉状の保護シートを形成する場合について説明する。
【０１１３】
図１１に示す従業者証プリンタ１６はカード供給手段６０及び保護シート付与部５０を有している。このカード供給手段６０は第１の搬送ベルト装置４１を有している。搬送ベルト装置４１の一端上部には、生カード供給部４２が設けられている。生カード供給部４２には従業者証申請者２０の個人情報Ｄ２を書き込むために、予め枚葉状にカットされた複数の従業者証用の生カード基板３０’が、顔画像形成領域面を上に向けてストックされている。この例では、生カード基板３０’が１枚づつ生カード供給部４２から搬送ベルト装置４１へ投下するように自動供給される。
【０１１４】
その自動供給後の搬送ベルト装置４１上の生カード基板３０’は左側から右側に搬送される。搬送ベルト装置４１上には画像形成部（サーマルプリンタ）４３が設けられ、生カード基板３０’が左側から右側に移動される間に、その所定領域Ｐ３に従業者証申請者２０の氏名や、従業者証発行日などが記録され、その画像形成領域Ｐ４に従業者証申請者２０の顔画像が形成される。
【０１１５】
この搬送ベルト装置４１の下流側には第２の搬送ベルト装置４９が設けられ、この例では個人情報Ｄ２が印字された生カード基板３０’が左側から右側に搬送される。搬送ベルト装置４９上には保護シート付与部５０が設けられ、生カード基板３０’にフィルム状の保護シート５１が供給される。
【０１１６】
この例で保護シート５１にはラミネートフィルムを枚葉状（カットシート状）に積層されたものが備えられ、そのラミネートフィルムは一方の面に図示しない接着シートを有している。もちろん、保護シート５１にはラミネートフィルムをロール状に巻き取ったものを使用してもよい。
【０１１７】
また、保護シート５１はラミネートフィルムに限定されることはなく、ホットスタンプフィルムをロール状に巻き取ったもの、又は、ホットスタンプフィルムをカットシート状に積層されたものも使用できる。保護シート付与部５０には真空熱プレス装置５２が設けられ、搬送ベルト装置４１からの生カード基板３０’と保護シート付与部５０からの保護シート５１とを受け、その生カード基板３０’とその保護シート５１とが図示しない接着シートを介して張り合わされる。この際に、接着シート上の紙シートは剥離され、カス紙として巻き取られる。
【０１１８】
この真空熱プレス装置５２は搬送路上に配置された平型のプレス部を有しており、保護シート５１の上方から所定の圧力が加えられる。そのために、プレス部が上下方向に移動できるようになされている。このプレス部には電気ヒータ（図示せず）が設けられ、保護シート５１及び生カード基板３０’を所定の温度に加熱するようになされている。
【０１１９】
この例では接着シートの種類にもよるが加熱温度は４０℃〜１２０℃程度であり、加熱時間は１０秒〜１２０秒程度である。この接着シートは熱を加えると溶融し、それが冷えると固化するものである。保護シート５１を加熱貼合する装置は真空熱プレス装置５２に限られることはなく、通常の熱プレスでも、ヒートローラ装置であってもよい。また、真空熱プレス装置５２の下流側には冷却部５３が設けられ、加熱貼合された生カード基板３０’が冷却される。これにより、保護シート５１で保護された従業者証３０が完成する。
【０１２０】
続いて、従業者証発行システム１００における処理例を説明する。図１２は本発明に係る第１の実施例としての従業者証発行システム１００における処理例を示すフローチャートである。
【０１２１】
この例では、撮影ユニットＵ１が基準撮影ユニットとして定められ、従業者証申請者２０が持参した交付申請書４０に基づいて、複数の従業者証申請者の顔画像を他の撮影ユニットＵ２〜Ｕｎで並列に分担して撮影し、その後、顔画像入りの従業者証３０を発行する場合を想定する。色補正ＬＵＴ及び基準撮影情報は、予めｎ台の撮像ユニットＵ１〜Ｕｎに対して既に設定されているものとする。
【０１２２】
これを前提にして、基準撮影ユニットＵ１では図１２のフローチャートのステップＣ１１でスキャナＳＣ１を使用して当該従業者証申請者の交付申請書４０が読み取られ、その従業者証申請者の個人識別情報ＩＤ及び個人情報Ｄ２１が取得される。ここで、個人情報Ｄ２１とは従業者証申請者本人の氏名、生年月日、現住所、本籍地及び先に登録された印鑑に関する登録情報などをいうものとする。
【０１２３】
その後、ステップＣ１２に移行して当該従業者証申請者２０の顔画像が撮影ユニットＵ１で撮影され、顔画像情報Ｄ１１が取得される。そして、ステップＣ１３では当該従業者証申請者２０の顔画像情報Ｄ１１が修正された色補正ＬＵＴによって色補正される。そして、ステップＣ４に移行する。
【０１２４】
これに並行して、撮影ユニットＵ２ではステップＣ２１でスキャナＳＣ２を使用して他の従業者証申請者の交付申請書４０が読み取られ、その従業者証申請者の個人識別情報ＩＤ及び個人情報Ｄ２２が取得される。その後、ステップＣ２２に移行して当該従業者証申請者の顔画像が撮影ユニットＵ２を使用して撮影され、顔画像情報Ｄ１２が取得される。そして、ステップＣ２３では当該従業者証申請者の顔画像情報Ｄ１２が修正後の色補正ＬＵＴにより補正される。そして、ステップＣ４に移行する。
【０１２５】
同様にして、撮影ユニットＵｎではステップＣｎ１でスキャナＳＣｎを使用して他の従業者証申請者の交付申請書４０が読み取られ、その従業者証申請者の個人識別情報ＩＤ及び個人情報Ｄ２ｎが取得される。その後、ステップＣｎ２に移行して当該従業者証申請者の顔画像が撮影ユニットＵｎを使用して撮影され、顔画像情報Ｄ１ｎが取得される。そして、ステップＣｎ３では当該従業者証申請者の顔画像情報Ｄ１ｎが修正後の色補正ＬＵＴにより補正される。
【０１２６】
その後、ステップＣ４に移行して従業者証プリンタ１６では、当該従業者証申請者の顔画像情報Ｄ１〜Ｄ１ｎ、個人識別情報ＩＤ、個人情報Ｄ２１〜Ｄ２ｎに基づいて顔画像入りの従業者証３０が作成される。その後、ステップＣ５に移行して従業者証３０を全部発行したか否かが判断される。この際の判断は担当者によって、例えば、当日の就業時間の終了及び最後尾の従業者証申請者の従業者証を発行したか否かにより決定される。従って、ステップＣ５で顔画像入りの従業者証３０を全部発行されていない場合には、ステップＣ４に戻って上述の処理が繰り返される。
【０１２７】
このように、本発明に係る第１の実施例としての従業者証発行システム１００によれば、複数の従業者証申請者の顔画像をｎ台の撮影ユニットＵ１〜Ｕｎで分担して撮影する場合、基準撮影ユニットＵ１以外の撮影ユニットＵ２〜Ｕｎにより取得された従業者証申請者の顔画像を色補正した出力画像と、基準撮影ユニットＵ１により取得された従業者証申請者の顔画像を色補正した出力画像とを揃えることができる。
【０１２８】
従って、各々の撮影ユニットＵ１〜Ｕｎで照明光や環境温度等の撮影条件がばらついた場合であっても、最適に調整された従業者証プリンタ１６をその都度、撮影ユニットＵ１〜Ｕｎに合わせることなく、高品質の顔画像入りの従業者証３０を作成することができる。
【０１２９】
（３）実施例２
図１３は本発明に係る第２の実施例としての従業者証発行システム１００’における処理例を示すフローチャートである。
【０１３０】
この例では撮影ユニットＵ２に色補正ＬＵＴの修正機能が無い場合を想定し、この修正を従業者証プリンタ１６で行う場合を前提とする。他の処理条件は第１の実施例と同様とする。
【０１３１】
これを前提にして、基準撮影ユニットＵ１では図１３のフローチャートのステップＥ１１でスキャナＳＣ１を使用して当該従業者証申請者の交付申請書４０が読み取られ、その従業者証申請者の個人識別情報ＩＤ及び個人情報Ｄ２１が取得される。その後、ステップＥ１２に移行して当該従業者証申請者２０の顔画像が撮影ユニットＵ１で撮影され、顔画像情報Ｄ１１が取得される。そして、ステップＥ１３では当該従業者証申請者２０の顔画像情報Ｄ１１が基準となった色補正ＬＵＴにより補正される。その後、ステップＥ４に移行する。
【０１３２】
これに並行して、撮影ユニットＵ２ではステップＥ２１でスキャナＳＣ２を使用して他の従業者証申請者の交付申請書４０が読み取られ、その従業者証申請者の個人識別情報ＩＤ及び個人情報Ｄ２２が取得される。その後、ステップＥ２２に移行して当該従業者証申請者の顔画像が撮影ユニットＵ２を使用して撮影され、顔画像情報Ｄ１２が取得される。この例で当該撮影ユニットＵ２には修正機能がないので、ステップＥ４に移行する。
【０１３３】
他の撮影ユニットＵｎは修正機能が設けられている。従って、ステップＥｎ１でスキャナＳＣｎを使用して他の従業者証申請者の交付申請書４０が読み取られ、その従業者証申請者の個人識別情報ＩＤ及び個人情報Ｄ２ｎが取得される。その後、ステップＥｎ２に移行して当該従業者証申請者の顔画像が撮影ユニットＵｎを使用して撮影され、顔画像情報Ｄ１ｎが取得される。そして、ステップＥｎ３では当該従業者証申請者の顔画像情報Ｄ１ｎが修正後の色補正ＬＵＴにより補正される。
【０１３４】
その後、ステップＥ４に移行して従業者証プリンタ１６ではヘッダ情報を読み出してフラグをチェックし、色補正ＬＵＴの修正が必要か否かを判断するようになされる。この例では撮影ユニットＵ２以外の撮影ユニットＵ１，Ｕ３〜Ｕｎは従業者証プリンタ１６における色補正ＬＵＴの修正が不要であるためステップＥ６に移行する。
【０１３５】
撮影ユニットＵ２による場合は、ステップＥ５に移行して従業者証プリンタ１６における色補正ＬＵＴの修正が行われる。従業者証プリンタ１６ではチャート画像情報に基づいてこの顔画像情報Ｄ１２を修正するようになされる。例えば、基準撮影ユニットＵ１で取得される基準撮影画像情報と、撮影ユニットＵ２で取得されるの参照撮影画像情報（チャート撮影情報）との違い（相対値）を求めることにより算出し、この相対値分を除くように色補正ＬＵＴをシフトさせる。
【０１３６】
そして、ステップＥ６に移行して当該従業者証申請者の顔画像情報Ｄ１１〜Ｄ１ｎ、個人識別情報ＩＤ、個人情報Ｄ２１〜Ｄ２ｎに基づいて顔画像入りの従業者証３０が作成される
。その後、ステップＥ７に移行して従業者証３０を全部発行したか否かが判断される。この際の判断は担当者によって、例えば、当日の就業時間の終了及び最後尾の従業者証申請者の従業者証を発行したか否かにより決定される。従って、ステップＥ７で顔画像入りの従業者証３０を全部発行されていない場合には、ステップＥ４に戻って上述の処理が繰り返される。
【０１３７】
このように、本発明に係る第２の実施例としての従業者証発行システム１００’によれば、複数の従業者証申請者の顔画像をｎ台の撮影ユニットＵ１〜Ｕｎで分担して撮影する場合であって、色補正ＬＵＴの修正機能の無い撮影ユニットＵ２が混在した場合でも、撮影ユニットＵ２以外の撮影ユニットＵ１、Ｕ３〜Ｕｎにより取得された従業者証申請者の顔画像を色補正した出力画像と、撮影ユニットＵ２により取得された従業者証申請者の顔画像を色補正した出力画像とを揃えることができる。
【０１３８】
従って、各々の撮影ユニットＵ１〜Ｕｎで照明光や環境温度等の撮影条件がばらついた場合であっても、従業者証プリンタ１６において、高品質の顔画像入りの従業者証３０を作成することができる。これらの実施例ではＩＤカードに関して従業者証３０の場合について説明したが、これに限られることはなく、キャッシュカード、社員証、会員証、学生証、身分証明書、外国人登録証及び各種運転免許証などについても適用することができる。
【０１３９】
（３）第３の実施例
次に本発明に係る証明写真システムにおける色補正方法についての別の実施例を説明する。
【０１４０】
図１４はＩＤカード作成システムの構成例を示す図である。
【０１４１】
この実施例におけるシステムは、被写体を撮影するための撮影装置、撮影装置で得られた画像情報（以後、便宜上画像データと称する場合もあるが同義である）を色補正する色補正変換装置、および色補正された画像データに基づいてＩＤカードを作成するＩＤカードプリンタで構成される。
【０１４２】
１）撮影装置
撮影装置は、被写体（本実施例の場合、ＩＤカードに付帯される顔画像を有する人物）をビデオカメラ等で直接撮影する直接撮影することによって画像データを取得するための撮影装置（直接型撮影装置）、および、ＩＤカードを作成する上での申請書に貼付された顔写真をビデオカメラ等で間接的に撮影することによって画像データを取得するための撮影装置（間接型撮影装置）がある。
【０１４３】
本発明において、前述のいずれの撮影の方法によっても同様の効果を奏することができるので、本実施例においては直接型または間接型のいずれも撮影装置として説明する。
【０１４４】
また本実施例で説明するシステムにおいて撮影装置は複数台（撮影装置Ａ〜Ｃ）設けられているが、予め設定された基準撮影画像情報（具体的には後述する色票撮影画像データに対応する）に基づいて撮影画像の色補正がされるのであれば、１台であってもよいし、更に複数台設けられてもよい。
【０１４５】
撮影装置によって取得された画像データ（特許請求の範囲において撮影画像情報に対応する）は、撮影装置を構成するカメラの種類によってアナログ画像データであったり、デジタルデータである場合があるが、後述する色変換装置における色補正を行うためにはデジタルデータであることが好ましい。しかしながらアナログ画像データであっても図示しないＡ／Ｄ変換装置（アナログからデジタルに変換する装置）を通過させることによってデジタル画像データを色変換装置に送信することが可能となる。このため撮影装置は被写体を撮影して（アナログまたはデジタルにかかわらず）画像データを外部に送信できる装置であればよく、ビデオカメラ、デジタルカメラ（電子カメラ）が使用できる。
【０１４６】
また撮影装置は、複数の異なった被写体および複数の異なった画像を撮影する際に（被写体に対応する）画像情報に応じたＩＤ番号情報を画像データに付帯させることが好ましく、本実施例では画像データおよび色補正後の画像データにＩＤ番号情報を付帯させ、色変換装置においては色補正の対象となる画像の特定や、後述するＩＤカードプリンタでは、プリントにかかわる情報（出来上がり画像の情報、プリント履歴情報等）のフィードバックおよびファイリングに利用している。
【０１４７】
なおＩＤ番号情報はＩＤカードを作成するために必要とされる情報（被写体を特定する情報、撮影画像情報を特定する情報、または撮影装置を特定する情報等）に対応し、それらを特定する番号の情報であるが、本実施例では被写体を特定する情報、例えばＩＤカードに記載する記載事項（名前、住所など）に関する情報を特定する情報としてＩＤ番号情報を利用している。また、本実施例においては撮影装置を特定する情報を撮影装置識別符号として撮影画像データに付帯させているが、この撮影装置識別符号をＩＤ番号情報として取り扱ってもよい。
【０１４８】
更に、撮影装置で被撮影者を撮影する通常撮影モードと、前記撮影装置に対応する前記色補正変換テーブルを作成する色補正変換テーブル作成モードとが設けられている場合には、ＩＤ番号情報をモードに応じて設定することによって、それぞれのモードに応じた撮影画質に調整することができる（例えば、色補正変換テーブル作成モードでは、１画像に対する入出力情報量を、通常撮影モードに比べて多くすることができる）ので、より高精度の色補正が可能となる。また利用者にとっても通常の撮影との混同をまねく等のトラブルが生じない。
【０１４９】
２）色変換装置
この色変換装置では、予め設定された基準撮影画像情報（具体的には色票撮影画像データに対応する）と、個々の撮影装置で取得された撮影画像情報に基づいて、個々の撮影装置に対応する色補正変換テーブルを作成することができる。
そこで色補正変換テーブル作成手順を説明する。
【０１５０】
１．色変換装置は、ＩＤカードプリンタおよび表示手段（モニタ）へ出力する画像データを撮影装置にかかわらず標準化する。例えば、プリンタ本実施例のように複数の撮影装置によって撮影された撮影画像を表示装置で表示したときに、いずれの撮影装置で撮影した撮影画像でも同じ画像が表示されるような画像データを出力する。
【０１５１】
色変換装置には、撮影装置からＩＤ番号情報、撮影装置識別符号、色票撮影画像データ（基準撮影画像情報）、実画像データが送信される。なお色補正変換テーブルを作成する際には、実画像データは参照撮影画像情報（先述の参照被写体を撮影することによって取得される画像情報）となる。
【０１５２】
ここで、色票撮影画像データとは例えば実施例１で説明した基準被写体を特定の撮影装置で撮影することによって得られる画像データであるが、後述する標準化マトリクスを算出するために十分であれば撮影することなく測定値のみを色票撮影画像データとしてもよい。
【０１５３】
なお色票撮影画像データ（基準撮影画像情報）が送信されない場合もある。これは、色補正変換テーブルを作成するタイミングとは異なるタイミングで色票を撮影して得られた色票撮影画像データを色変換装置に送信し、画像ファイルとして記憶しておくこともあるからである。
２．色変換装置では、色票撮影画像データと撮影装置識別符号に対応した実画像データのそれぞれに関して階調特性（γ特性）をリニア化すべく階調変換した後、両者を比較して階調特性の標準化マトリクス（特許請求の範囲では相対値に対応する）を算出する。
【０１５４】
本実施例では標準化マトリクスを求めるために階調特性をリニアに階調変換しているが、これらの操作は色補正の精度をより向上させるためであって、必須な操作ではない。
【０１５５】
なお、標準化マトリクスは実施例１におけるステップＢ５で説明したマトリックスＡと同様に、（１）式〜（３）式を用いて求めることができる。その場合、式中のＴは色票撮影画像データに対するＲＧＢ値のマトリクスであり、Ｓは実画像データに対するＲＧＢマトリクスに相当する。
【０１５６】
３．以上のように求められた標準化マトリクス（マトリクスＡとする）を用いて、システム中のメモリに記憶され撮影装置識別符号に対応した色補正変換テーブル（マトリクスＲとする）を次式（７）を用いて補正し、補正された色補正変換テーブル（マトリクスＲ’とする）を算出する。
【０１５７】
Ｒ’＝Ａ・Ｒ −−−−−（７）
このように個々の撮影装置に対応する色補正変換テーブルＲ’を作成することができる。
【０１５８】
この作成された色補正変換テーブルを用いて、個々の撮影装置で取得された撮影画像情報（参照撮影画像情報ではない実画像データ）を、ＩＤカードプリンタによる画像や表示装置（モニタ）上の画像が、全ての撮影装置に対して均等な画質となるように色補正することができる。また作成された色補正変換テーブルはメモリに記憶され撮影装置識別符号に対応した色補正変換テーブルを更新することもできるが、新規な色補正変換テーブルとして別途記憶することが好ましい。
【０１５９】
３）ＩＤカードプリンタ
ＩＤカードプリンタには、色変換装置によって色補正された画像データとＩＤ番号情報とが対応づけられた状態で送信される。またＩＤカードプリンタはＩＤカードの作成スピードの向上という観点からシステム中に複数台設けられてもよい。その場合、個々のＩＤカードプリンタに送信される画像データが色変換装置により標準化されていても、個々のＩＤカードプリンタの特性によって、プリント画像を好ましい画像に調整する必要が生じるため、ＩＤカードプリンタに色変換手段を設けて、送信された画像データの色補正を行ってもよい。
【０１６０】
ＩＤ番号情報と同様にＩＤカードに記載する事項に関する情報が画像データと対応づけられている場合には、それらの情報に基づいてＩＤカードを作成することができるが、ＩＤ番号情報のみが送信され、記載する事項に関する情報が記憶手段（設置場所は任意）に保存されている場合には、ＩＤ番号情報を検索情報として記憶手段の中から記載する記載事項に関する情報を検索し、画像データと検索された情報に基づいてＩＤカードを作成することができる。
【０１６１】
またＩＤカードプリンタはＩＤカードの作成スピードの向上という観点からシステム中に複数台設けられてもよい。その場合、個々のＩＤカードプリンタに送信される画像データが色変換装置により標準化されていても、個々のＩＤカードプリンタの特性によって、プリント画像を好ましい画像に最適化すべく調整する必要が生じるため、ＩＤカードプリンタに色変換手段を設けて、送信された画像データの色補正を行ってもよい。
【０１６２】
さらに、色票撮影画像データ（基準撮影画像情報）が予めＩＤカードプリンタに設けられた記憶手段に保存されている場合には、色変換手段が色変換装置で行われる色補正変換テーブル作成手順と同様に撮影画像に色補正を施すことが可能となる。
【０１６３】
以下に色補正変換テーブル作成手順を説明する。
１．ＩＤカードプリンタには、撮影装置からＩＤ番号情報、撮影装置識別符号、および実画像データ（参照撮影画像情報）が送信される。
２．ＩＤカードプリンタに設けられた色変換手段（内蔵されている必要はない）では、色票撮影画像データと撮影装置識別符号に対応した実画像データのそれぞれに関して階調特性（γ特性）をリニア化した後、両者を比較して階調特性の標準化マトリクス（特許請求の範囲では相対値に対応する）を算出する。
【０１６４】
階調特性をリニア化する操作は色補正の精度をより向上させるためであって、必須な操作ではない。
【０１６５】
なお、標準化マトリクスは実施例１におけるステップＢ５で説明したマトリックスＡと同様に、（１）式〜（３）式を用いて求めることができる。その場合、式中のＴは色票撮影画像データに対するＲＧＢ値のマトリクスであり、Ｓは実画像データに対するＲＧＢマトリクスに相当する。
【０１６６】
３．以上のように求められた標準化マトリクス（マトリクスＡとする）を用いて、システム中のメモリに記憶され撮影装置識別符号に対応した色補正変換テーブル（マトリクスＲとする）を前述の（７）式を用いて補正し、補正された色補正変換テーブル（マトリクスＲ’とする）を演算する。
【０１６７】
このように個々の撮影装置に対応する色補正変換テーブルＲ’を作成することができる。
【０１６８】
この作成された色補正変換テーブルは撮影装置とＩＤカードプリンタに対応しているので、これを用いて個々の撮影装置で取得された撮影画像情報（参照撮影画像情報ではない実画像データ）を、ＩＤカードプリンタによる画像が全ての撮影装置に対して均等な画質となるように色補正することができる。
【０１６９】
図１５は撮影装置の中に図１４で説明した色変換装置の機能が含まれている場合の構成図である。このような構成であっても、図１４で説明した実施態様と同様の効果が得られる。また色変換装置を別に設ける必要がなくなるのでシステム全体のサイズを縮小することが可能となる。
【０１７０】
【発明の効果】
以上説明したように、本発明に係るＩＤカード作成システムおよびそのシステムにおける色補正方法によれば、予め設定された基準撮影画像情報に基づいて、撮影装置により取得された撮影画像の色補正することを特徴とするので、色補正方法によって、撮影装置に対応する色補正変換テーブルを作成することができるので、撮影装置が複数設置された場合を想定しても、予め設定された基準撮影画像情報に基づいて、撮影条件によらず出力画像のばらつきを効果的に抑制することができる。
【０１７１】
また基準撮影装置を設定し、その基準撮影装置により基準撮影被写体を撮影することによって、基準撮影画像情報を取得することができるので、特に撮影装置が複数設置された場合に、どの撮影装置を基準撮影装置とするのかが任意であるにもかかわらず、それらの出力画像のばらつきを抑制することができる。このため、特別な知識を有しない利用者にとっても容易に出力画像の調整作業を行うことができる。
【０１７２】
また特に通常撮影モードと、色補正変換テーブル作成モードとが設けられている場合には、それぞれのモードに応じた撮影画質に調整することができる（例えば、色補正変換テーブル作成モードでは、１画像に対する入出力情報量を、通常撮影モードに比べて多くすることができる）ので、より高精度の色補正が可能となる。また利用者にとっても通常の撮影との混同をまねく等のトラブルが生じない。
【０１７３】
また、この構成によって、基準撮影装置以外の撮影装置により取得された被撮影者の顔画像を色補正した出力画像と、基準撮影装置により取得された被撮影者の顔画像を色補正した出力画像とを揃えることができる。従って、各々の撮影装置で照明光や環境温度等の撮影条件がばらついた場合であっても、どの撮影装置をとっても高品質の顔画像を得ることができる。
【０１７４】
本発明に係るＩＤカード作成システムによれば、顔画像入りのＩＤカードを作成する場合に、複数の撮影装置のうち１つを基準撮影装置と定め、基準撮影装置により取得された基準撮影画像に基づいて基準撮影装置以外の撮影装置により取得された撮影画像の色補正をする場合には、基準撮影装置以外の撮影装置により取得された被撮影者の顔画像を色補正した出力画像と、基準撮影装置により取得された被撮影者の顔画像を色補正した出力画像とを揃えることができる。従って、各々の撮影装置で照明光や環境温度等の撮影条件がばらついた場合であっても、高品質の顔画像入りのＩＤカードを作成することができる。
【０１７５】
この発明は、自動車免許証等の免許証類、身分証明書、パスポート、外国人登録証、図書館利用カード、キャッシュカード、クレジットカード、従業者証、社員証、会員証、医療カード及び学生証などのＩＤカードのＩＤカード作成システムに適用して極めて好適である。
【図面の簡単な説明】
【図１】本発明に係る実施形態としての色補正方法が適用されるＩＤカード作成システム１０の構成例を示すブロック図である。
【図２】ＩＤカード作成システム１０における色補正例を示すフローチャートである。
【図３】本発明に係る各実施例としての従業者証発行システム１００の構成例を示すブロック図である。
【図４】色補正ＬＵＴの修正時の撮影例を示すイメージ図である。
【図５】その情報取得領域の設定例を示す拡大図である。
【図６】撮影ユニットＵｉの構成例を示すブロック図である。
【図７】カメラ１２の内部構成例を示すブロック図である。
【図８】基準撮影ユニットＵｊとされたカメラＮｏ．＃ｊにおける色補正ＬＵＴの修正例を示すフローチャートである。
【図９】従業者証の交付申請書４０の構成例を示すイメージ図である。
【図１０】従業者証３０の構成例を示すイメージ図である。
【図１１】従業者証プリンタ１６の構成例を示す概念図である。
【図１２】第１の実施例（実施例１）としての従業者証発行システム１００における処理例を示すフローチャートである。
【図１３】第２の実施例（実施例２）としての従業者証発行システム１００’における処理例を示すフローチャートである。
【図１４】実施例３としてのＩＤカード作成システムの構成図（その１）
【図１５】実施例３としてのＩＤカード作成システムの構成図（その２）
【図１６】実施例３としてのＩＤカード作成システムの構成図（その３）
【符号の説明】
１ 基準被写体
７ 白色板
８ 肌色板
１０ ＩＤカード作成システム
１１ 固定ディスク駆動装置（ＨＤＤ）
１２ カメラ
１３ 入力ツール
１４ ＣＰＵ（制御装置）
１５ ＥＥＰＲＯＭ
１６ 従業者証プリンタ（ＩＤカード作成手段）
１７ モニタ
１８ 光源
２４ カメラ制御部
３０ 従業者証（ＩＤカード）
３５ サーバー装置
３６ データベース
４０ 交付申請書
７０ 背景板[0001]
BACKGROUND OF THE INVENTION
This invention includes licenses such as automobile licenses, identification card, passport, alien registration card, library card, cash card, credit card, employee ID card, employee ID card, membership card, medical card, student ID card, etc. The present invention relates to a color correction method and an ID card creation system.
[0002]
[Prior art]
IDs such as licenses such as automobile licenses, ID cards, passports, alien registration cards, library cards, cash cards, credit cards, employee ID cards, employee ID cards, employee ID cards, membership cards, medical cards and student ID cards There are many cases where ID photographs converted into image information are provided on cards and their application forms. Moreover, in this type of ID card creation system, a plurality of photographing devices are prepared and face image information is acquired. In many cases, face image information is acquired using a photographing device such as a digital camera for still images or a video camera for moving images.
[0003]
In general, the ID photo is required not to deteriorate in image quality over a long period of, for example, 1 to 5 years. Also, according to the photographing system that handles ID photographs, there is a demand for an illumination device, a photographing device, a printing device, etc. that can obtain a face image of the same quality even if the subject is the same and the clothes and hairstyle are different. .
[0004]
[Problems to be solved by the invention]
By the way, according to the ID card making system according to the conventional method, depending on the photographing conditions such as illumination light and environmental temperature, even if the same person is photographed by the color, hairstyle, and hair color of the photographed person, The brightness may fluctuate.
[0005]
For this reason, when trying to capture the face images of a large number of subjects using a plurality of photographing devices, in order to obtain high-quality face images from any photographing device, the output device side such as a printing device Therefore, it is necessary to make adjustments including variations in illumination light and environmental temperature.
[0006]
These variations are largely affected by machine differences due to the use of a plurality of photographing machines, ceiling lights in the installation environment of the photographing machines, and external light. For example, when a camera is installed near the window or when a camera is installed in parallel, it may be affected by adjacent illumination light. In such a case, there is a problem that the optimum adjustment value of the output device must be shifted.
[0007]
Therefore, the present invention solves the above-described problems, and even if shooting conditions such as illumination light and environmental temperature vary among the respective shooting devices, a high-quality face image can be obtained with any shooting device. It is an object of the present invention to provide a color correction method and an ID card creation system in an ID card creation system that can be obtained.
[0008]
[Means for Solving the Problems]
The present applicant has solved the above problems and achieved the object by the color correction method and ID card creation system in the ID card creation system having the following configuration.
[0009]
(1) A color correction method in an ID card creation system, wherein color correction is performed on a captured image acquired by an imaging device based on preset reference captured image information.
[0010]
(2) A reference subject is photographed by the photographing device to obtain reference photographed image information, a relative value is calculated by comparing the reference photographed image information and the standard photographed image information, and the reference value is calculated based on the relative value. 2. The ID card creation according to claim 1, wherein a color correction conversion table corresponding to the photographing apparatus is created, and color correction of the photographed image acquired by the photographing apparatus is performed using the color correction conversion table. Color correction method in the system.
[0011]
Since the color correction conversion table corresponding to the imaging device can be created by the color correction methods (1) and (2) above, a preset standard is assumed even when a plurality of imaging devices are installed. Based on the photographed image information, variations in output images can be effectively suppressed regardless of the photographing conditions.
[0012]
(3) The color correction method in the ID card creation system according to claim 1 or 2, wherein the reference photographed image information is acquired by photographing a reference subject with a reference photographing device.
[0013]
(4) The color correction conversion table corresponding to the imaging device captures a reference subject by the imaging device to acquire reference captured image information, and compares the reference captured image information with the reference captured image information. 4. The color in the ID card creation system according to claim 2, wherein the color is created by calculating a relative value and correcting a color correction conversion table corresponding to the reference photographed image information based on the relative value. Correction method.
[0014]
(5) The color correction conversion table corresponding to the imaging device captures a reference subject by the imaging device to acquire reference captured image information, and compares the reference captured image information with the reference captured image information. 4. The color correction method in the ID card creation system according to claim 3, wherein the color correction method is created by calculating a relative value and correcting a color correction conversion table corresponding to the reference photographing device based on the relative value.
[0015]
According to the color correction methods (3) and (5) above, since the reference photographing device is set and the reference photographing object is photographed by the reference photographing device, the reference photographing image information can be acquired. It goes without saying that the effects obtained in (1) and (2) can be obtained, but in particular when a plurality of photographing devices are installed, which photographing device is used as the reference photographing device is arbitrary. Regardless, variations in the output images can be suppressed. For this reason, it is possible to easily adjust the output image even for users who do not have special knowledge. Further, according to the color correction method (4), the same effect can be obtained without setting a reference photographing apparatus.
[0016]
(6) A normal photographing mode for photographing a subject by the photographing apparatus and a color correction conversion table creation mode for creating the color correction conversion table corresponding to the photographing apparatus are provided. Item 6. A color correction method in the ID card creation system according to any one of Items 2 to 5.
[0017]
According to the color correction method of (6) above, the effects obtained in (2) to (5) above can be obtained. In particular, the normal photographing mode and the color correction conversion table creation mode are provided. By providing, it is possible to adjust the shooting image quality according to each mode (for example, in the color correction conversion table creation mode, the input / output information amount for one image should be larger than that in the normal shooting mode) Therefore, more accurate color correction is possible. In addition, troubles such as confusion with normal shooting do not occur for the user.
[0018]
(7) The color correction method in the ID card creation system according to claim 5, wherein dedicated ID number information is set in executing the color correction conversion table creation mode.
[0019]
According to the color correction method in the ID card creation system of (7) above, in addition to the effects obtained in (6) above, the color correction conversion table creation (color correction LUT Only correction) can be performed reliably.
[0020]
(8) An ID card creation system for creating an ID card to which at least a part of an image of a photographed person is attached, wherein the photographed image is based on a photographed image obtained by photographing at least a part of the photographed person. A pre-set reference photographic image information, comprising: a photographic device for acquiring information; and card creation means for creating an ID card attached with at least a part of the image of the subject based on the photographic image information Based on the above, an ID card creation system, wherein the photographed image is color-corrected.
[0021]
(9) Reference photographing image information is obtained by photographing a reference subject with the photographing device, the reference photographed image information is compared with the standard photographed image information, a relative value is calculated, and the reference value is calculated based on the relative value. 9. The ID card creation system according to claim 8, wherein a color correction conversion table corresponding to a photographing apparatus is created, and the photographed image is color-corrected using the color correction conversion table.
[0022]
According to the ID card creation system of (8) and (9) above, the color correction conversion table corresponding to the photographing device can be created. Therefore, even if a case where a plurality of photographing devices are installed is set in advance. Based on the reference photographed image information, variations in the output image can be effectively suppressed regardless of the photographing conditions.
[0023]
(10) The ID card creation system according to any one of claims 8 to 9, wherein the reference photographed image information is acquired by photographing a reference subject with a reference photographing device.
[0024]
(11) The color correction conversion table corresponding to the photographing device captures a reference subject by the photographing device to obtain reference photographed image information, and compares the reference photographed image information with the reference photographed image information. 11. The ID card creation system according to claim 10, wherein the ID card creation system is created by calculating a relative value and correcting a color correction conversion table corresponding to the reference photographing device based on the relative value.
[0025]
According to the ID card creation system of the above (10) and (11), the reference photographing image information can be acquired by setting the reference photographing device and photographing the reference photographing subject with the reference photographing device. Needless to say, the effects obtained in the above (8) and (9) can be obtained, but in particular when a plurality of photographing devices are installed, which photographing device is used as the reference photographing device is arbitrary. Nevertheless, variations in the output images can be suppressed. For this reason, it is possible to easily adjust the output image even for users who do not have special knowledge.
[0026]
(12) The ID card creation system according to any one of claims 8 to 9, wherein the reference image information is provided in the card creation means.
(13) The ID card according to any one of claims 8 to 11, wherein the photographing device is configured to attach the reference photographed image information as header information of the photographed image information and transfer the information to the card creating means. Creation system.
[0027]
(14) Photographing a reference subject with the photographing device to obtain reference photographed image information, calculating a relative value by comparing the reference photographed image information and the standard photographed image information, and based on the relative value, A color correction conversion table corresponding to the photographing apparatus and the card creating means is created, the photographed image information is color-corrected using the color correction conversion table, and the subject image is corrected based on the color-corrected photographed image information. The ID card creation system according to claim 12 or 13, wherein an ID card with at least a part of an image of a photographer is created.
[0028]
(15) The color correction conversion table corresponding to the photographing device and the card creating unit obtains reference photographed image information by photographing a reference subject with the photographing device, and the reference photographed image information and the standard photographed image information. 15. The ID card creation according to claim 14, wherein a relative value is calculated by comparing and a color correction conversion table corresponding to the reference image information is modified based on the relative value. system.
[0029]
According to the ID card creation system of the above (12) to (15), it is a matter of course that the effects obtained in the above (8) and (9) can be obtained. Thus, by creating a color correction conversion table corresponding to each of the photographing apparatus and the card creating means, it is possible to suppress variations in the output image due to the characteristics of the photographing apparatus and the characteristics of the card creating means.
[0030]
(16) The ID card creation system according to (15), wherein a color correction conversion table corresponding to the reference image information is provided in the card creation means.
[0031]
According to the ID card creation system of (16) above, it is a matter of course that the effects obtained in (15) above can be achieved, but in particular both the reference image information and the color correction conversion table corresponding to the reference image information. Is provided in the card creation means, so that an optimum color correction conversion table can be created without being restricted by a change in photographing conditions by the photographing apparatus.
[0032]
(17) A normal photographing mode for photographing a subject with the photographing device and a color correction conversion table creation mode for creating the color correction conversion table corresponding to the photographing device and the card creating means are provided. The ID card creation system according to claim 14, wherein:
[0033]
According to the ID card creation system of (17) above, it is a matter of course that the effects obtained in (14) to (17) can be obtained. In particular, the normal shooting mode and the color correction conversion table creation mode are provided. By providing, it is possible to adjust the shooting image quality according to each mode (for example, in the color correction conversion table creation mode, the input / output information amount for one image should be larger than that in the normal shooting mode) Therefore, more accurate color correction is possible. In addition, troubles such as confusion with normal shooting do not occur for the user.
[0034]
(18) The ID card creation system according to claim 17, wherein dedicated ID number information is set in executing the color correction change table creation mode.
[0035]
According to the ID card creation system of (18) above, in addition to the effects obtained in (17) above, only the color correction conversion table creation (color correction LUT correction) is distinguished from the normal shooting mode. It is possible to perform reliably.
[0036]
(19) The ID card creation system according to any one of claims 8 to 18, wherein an ID card attached with an image including a face of the subject is created.
[0037]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a color correction method and an ID card creation system in an ID card creation system as an embodiment of the present invention will be described with reference to the drawings.
[0038]
(1) Embodiment
FIG. 1 is a block diagram illustrating a configuration example of an ID card creation system 10 to which a color correction method according to an embodiment of the present invention is applied.
[0039]
In this embodiment, one of a plurality of photographing devices is defined as a reference photographing device, and a color of a photographed image obtained by a photographing device other than the reference photographing device is corrected based on a reference photographing image obtained by the reference photographing device. Thus, the output image obtained by color-correcting the face image of the photographed person acquired by the photographing apparatus other than the reference photographing apparatus and the output image obtained by color-correcting the face image of the photographed person obtained by the reference photographing apparatus are aligned. In addition, it is possible to obtain high-quality face images with any photographing device, even if the photographing conditions such as illumination light and environmental temperature vary among the photographing devices. .
[0040]
An ID card creation system 10 shown in FIG. 1 includes n photographing devices #i (i = 1 to n), and photographs the upper body including the face of the subject. A digital still camera is used for the photographing apparatus #i. Of course, the photographing apparatus #i may be a video camera that handles moving image information. The n imaging devices # 1 to #n are connected to a communication means 3 such as a LAN and connected to another processing device 4.
[0041]
The other processing device 4 is a filing device, a server device, a printer device (corresponding to the card creation means in the claims), or the like. The image information acquired by the photographing device #i is output to a printer device, etc., and licenses such as a car license, identification card, passport, alien registration card, library card, cash card, credit card, employee It is used to form an image in the ID photo column of ID cards such as ID cards, employee ID cards, membership ID cards, medical cards, and student ID cards.
[0042]
Note that the image information acquired by the imaging device #i often includes mainly the face image of the subject, but is not limited to the face image. It may be an image relating to the owner who needs the ID card, and may be, for example, an image of the owner's fingerprint or a medical photograph (X-ray photograph).
[0043]
Next, an example of color correction in the ID card creation system 10 will be described. FIG. 2 is a flowchart showing an example of color correction in the ID card creation system 10. In this embodiment, n imaging devices # 1 to #n are arranged in an ID card creation center or the like, and any one of the n imaging devices # 1 to #n is defined as a reference imaging device #j. A case is assumed in which color correction is performed on a captured image acquired by an imaging apparatus #i other than the reference imaging apparatus #j based on the reference captured image acquired by the reference imaging apparatus #j.
[0044]
On the premise of this, n photographing devices # 1 to #n are arranged in a photographing room such as an ID card making center in step A1 of the flowchart shown in FIG. Thereafter, the process proceeds to step A2, and one of the n imaging devices # 1 to #n is defined as the reference imaging device #j. Here, in step A21, for example, a color correction conversion table (hereinafter referred to as a color correction LUT) created in advance in the photographing apparatus #j defined as the reference photographing apparatus is set.
[0045]
In this color correction LUT, first, image samples (for example, face images) of a plurality of subjects that are not subjected to color correction are photographed, and then converted to an appropriate color tone by performing image correction processing based on these image samples. . This is a three-dimensional lookup table of correction processing information when an image sample is converted into a desired color tone.
[0046]
Then, when applying this color correction LUT to a photographing apparatus other than the reference photographing apparatus, in step A22, the reference subject 1 is photographed under an arbitrary light source by the reference photographing apparatus to obtain a reference photographed image. As the light source, a normal fluorescent lamp or a halogen lamp is used.
[0047]
The reference subject 1 is a blue background plate as a background of the subject, a white plate or a flesh-colored plate for grasping shooting conditions. The blue, white, and skin color of the background are color charts for correcting the color correction LUT. The color chart can be improved in accuracy by increasing green and magenta in addition to white, flesh and blue. For example, green can be used instead of blue.
[0048]
Then, the process proceeds to step A3, and color correction is performed on the captured image acquired by the imaging device #i other than the reference imaging device #j based on the reference captured image acquired by the reference imaging device #j. Here, the reference photographic image acquired by the reference photographic device #j and almost the same color correction LUT as that set for the reference photographic device #j are set for the photographic devices #i other than the reference photographic device #j. In applying this, in step A33, the reference subject 2 is captured by the imaging device #i other than the standard imaging device #j to obtain a reference captured image.
[0049]
The reference subject 2 is a blue background plate which is the background of the person to be photographed by the photographing device #i other than the standard photographing device #j, a white plate or a flesh color plate for grasping photographing conditions in the photographing device #i, and the like. . Thereafter, the process proceeds to step A32 where the reference captured image and the standard captured image are compared to calculate a relative value. In step A33, the color correction LUT is corrected based on the relative value.
[0050]
In addition to using a blue background plate, white plate, and skin color plate as the reference subject 1 and the reference subject 2, a color chart plate that has a reference color necessary for color correction can also be used.
[0051]
In this case, it is captured in an image taken by the photographing device when the subject is not seated on the chair 19, and is hidden behind the subject when the subject is seated on the chair 19 shown in FIG. If a color chart plate is provided at a position where the image is not captured, the reference photographed image information and the reference photographed image information can be acquired using the timing when the subject is not photographed.
[0052]
On the contrary, a color chart plate is provided at a position where it is always photographed at the same time as the subject (not hidden behind the subject even if the subject is seated), and a standard picture is taken from the image of the color chart in the photographed image. Image information or reference captured image information can also be acquired.
[0053]
Thereafter, the photographing apparatuses #i other than the reference photographing apparatus #j correct the color of the image of the subject using the corrected color correction LUT in step A34. By doing this, color correction is performed on the output image obtained by performing color correction on the image of the photographed person acquired by the photographing apparatus #i other than the reference photographing apparatus #j, and on the image of the photographed person acquired by the reference photographing apparatus #j. Can be aligned with the output image.
[0054]
As a result, even if the photographing conditions such as illumination light and environmental temperature vary among the photographing devices #i, color correction almost equivalent to the output image of the reference photographing device #j is performed in the other photographing devices #i. be able to. A high-quality face image can be obtained from any photographing apparatus.
[0055]
(2) Example 1
FIG. 3 is a block diagram showing a configuration example of the employee card issuance system 100 as the first embodiment according to the present invention. FIG. 4 is an image diagram illustrating a configuration example at the time of capturing a reference image. FIG. 5 is an enlarged view showing a setting example of the information acquisition area in the reference subject 1.
[0056]
In this embodiment, an employee card issuance system 100 as an example of an ID card creation system is constructed, and this employee card issuance system 100 is applied to an employee card issuance center or the like. An employee ID card 30 is issued.
[0057]
In the employee card issuing system 100 shown in FIG. 3, n shooting units Ui (i = 1 to n) are prepared, and each shooting unit Ui is arranged in each shooting room of an employee card issuing center (not shown). The upper body including the face of the employee certificate applicant (photographed person) 20 is photographed. In each photographing room, in addition to the photographing unit Ui, a light source 18, a chair 19, and a background plate 70 are provided. A fluorescent lamp or a metal halide lamp is used as the light source 18, and illumination light is irradiated toward the face of the employee card applicant 20.
[0058]
The n imaging units U1 to Un are directly connected to an employee card printer 16 as an example of an ID card creating means through a communication cable such as a LAN or USB, and the face image information D1 acquired by each imaging unit Ui Transferred. In this example, each photographing unit Ui is provided with a scanner SCi, and the image of the delivery application form 40 is read, and the characters described in the application form 40 are recognized to identify a personal identification number (ID number) or The personal information D2 is read.
[0059]
This scanner SCi is also connected to the employee ID printer 16 through a communication cable such as a LAN or USB, and the ID number, personal information D2, etc. acquired by each scanner SCi are transferred. The application form data combining the face image information D1 and the personal information D2 together with the ID number of the employee card applicant 20 may be filed in a database (not shown).
[0060]
The employee ID printer 16 creates an employee ID 30 with a face image based on the face image information D1 and personal information D2. Also in this example, an arbitrary one of the n imaging units U1 to Un is defined as the reference imaging unit Uj, and the imaging units other than the reference imaging unit Uj based on the reference imaging image acquired by the reference imaging unit Uj. Color correction is performed on the captured image acquired by Ui.
[0061]
For example, the reference photographed image is acquired by photographing the reference subject 1 by the photographing unit Uj shown in FIG. Information obtained by converting the reference photographic image into binary data is hereinafter referred to as reference photographic information. The reference subject 1 is a blue background plate 70 that is the background of the employee card applicant 20 when the employee card applicant (photographer) 20 is not sitting on the chair 19 and a white color for grasping the shooting conditions. For example, a plate 7 or a flesh-colored plate 8.
[0062]
The background plate 70 has a vertical length of about 1.8 m and a horizontal length of about 0.9 to 1.2 m, and the front has a light blue color (blue). The white plate 7 has a vertical length of about 10 cm and a horizontal length of about 20 cm, and the front has a white color. The skin color plate 8 has a vertical length of about 10 cm and a horizontal length of about 20 cm, and the front has a skin color. The reference subject 1 is photographed after positioning the camera by a framing operation under an arbitrary light source 18 and without the employee certificate applicant 20 sitting on the chair 19, and this photographed image is treated as a reference photographed image. . As the light source 18, a normal fluorescent lamp or a halogen lamp is used.
[0063]
In this example, a reference photographed image as shown in the wavy circle diagram of FIG. 5 is acquired. In this reference photographed image, a white acquisition region 7A, a skin color acquisition region 8A, and blue acquisition regions 70A and 70B are set. . This is for calculating a difference (relative value) with respect to a reference photographed image (hereinafter also referred to as a chart image) with respect to each color acquisition region.
[0064]
Based on this reference photographed image, the color correction LUT in the other photographing unit Ui is corrected. This color correction LUT has a brightness / luminance level for face images in other photographing units Ui so that an appropriate color tone can be obtained when a face image photographed by the standard photographing unit Uj is output from the reference employee card printer 16. It is a conversion table for converting hue and saturation.
[0065]
Then, in applying this color correction LUT to the photographing unit Ui other than the standard photographing unit Uj, the reference subject is photographed by the photographing unit Ui other than the standard photographing unit Uj, and a chart image is acquired. Information obtained by converting the chart image into binary data is hereinafter referred to as chart image information. A relative value is calculated by comparing the chart image information with the reference photographing information. Here, the reference captured image of the white acquisition region 7A related to the reference subject 1 is compared with the chart image of the white acquisition region related to the reference subject, and a relative value of both is obtained.
[0066]
Similarly, the standard captured image of the skin color acquisition region 8A related to the reference subject 1 is compared with the chart image of the skin color acquisition region related to the reference subject, and the relative value of both is obtained. Further, the standard captured images of the blue acquisition regions 70A and B related to the reference subject 1 are compared with the chart image of the blue acquisition region related to the reference subject, and a relative value of both is obtained. The color correction LUT distributed to each photographing unit Ui is corrected so as to eliminate this relative value.
[0067]
Therefore, the photographing unit Ui other than the reference photographing unit Uj can correct the color of the face image of the employee card applicant 20 using the corrected color correction LUT. As a result, an output image obtained by color-correcting the face image of the employee card applicant 20 acquired by the shooting unit Ui other than the reference shooting unit Uj, and the face image of the employee card applicant 20 acquired by the reference shooting unit Uj. Can be aligned with the output image that has been color-corrected.
[0068]
As a result, even if the photographing conditions such as illumination light and environmental temperature vary among the photographing units U1 to Un, the employee card printer 16 that has been properly adjusted has a high-quality face image employee. Proof 30 can be created.
[0069]
Next, a configuration example of the photographing unit Ui will be described. FIG. 6 is a block diagram illustrating a configuration example of each photographing unit Ui. FIG. 7 is a block diagram illustrating an internal configuration example of the camera 12. In this example, it is assumed that the color correction LUT and the reference photographing information are distributed from the reference photographing device Uj to each photographing device Ui.
[0070]
The photographing unit Ui shown in FIG. 6 is an example of the photographing device #i, and has a camera 12 and photographs a face image of the employee card applicant 20 under a light source 18 such as a fluorescent lamp. D1 is output. The face image information D1 is used to form a face image in the face photo column of the employee ID card 30. In this example, the employee ID photo has a vertical length of 30 mm and a horizontal length of about 24 mm. As the camera 12, a digital camera for still images, a video camera for moving images, or the like is used. A system bus 28 is connected to the camera 12.
[0071]
A RAM 22 is connected to the system bus 28, and face image information D1 obtained by the camera 12 is temporarily stored. A CPU (Central Processing Unit) 14 is connected to the RAM 22 through a system bus 28, and the color of the face image of the employee card applicant 20 is corrected using the corrected color correction LUT. For example, the normal photographing mode and the correction mode for correcting the relative value (corresponding to the color correction conversion table creation mode in the claims) are prepared by the photographing unit Ui. In the normal shooting mode, the subject is shot, and in the correction mode, the color correction conversion table is corrected.
[0072]
When this correction mode is set, the camera 12 captures a reference subject and chart image information (reference captured image information) is acquired. The CPU 14 compares the chart image information with the reference photographing information and calculates a relative value. Here, the standard captured image information of the white acquisition region 7A related to the reference subject 1 and the chart image information of the white acquisition region related to the reference subject are compared by the CPU 14, and the difference (relative value) between them is obtained.
[0073]
Similarly, the CPU 14 compares the standard captured image information of the skin color acquisition region 8A related to the reference subject 1 and the chart image information of the skin color acquisition region related to the reference subject, and obtains the relative value of both. Further, the reference captured image information of the blue acquisition regions 70A and 70B related to the reference subject 1 is compared with the chart image information of the blue acquisition region related to the reference subject, and a relative value of both is obtained. The color correction LUT recorded in the EEPROM 15 is corrected by the CPU 14 so as to eliminate the relative value.
[0074]
For this correction, the camera photographing conditions are not corrected, but the reference value is shifted so that there is no difference (relative value) in the color correction LUT. Of course, it is also possible to correct the camera shooting conditions by the difference and take a picture of the subject. Thereby, the output image obtained by color-correcting the face image of the employee card applicant 20 acquired by the shooting unit Ui other than the reference shooting unit Uj and the face image of the employee card applicant 20 acquired by the reference shooting unit Uj. Can be aligned with the output image that has been color-corrected.
[0075]
Further, an EEPROM (read-only memory capable of electrically writing and erasing data) 15 is connected to the system bus 28, and for example, a color correction LUT is recorded. The color correction LUT may be recorded in the HDD 11 in the EEPROM 15. A keyboard 13 is connected to the CPU 14 through a system bus 28, and a correction mode is set when the color correction LUT is rewritten.
[0076]
In executing this correction mode, dedicated ID number information is input. When executing the correction mode, it is necessary to perform only the correction of the color correction LUT received from the reference shooting unit Uj separately from the normal shooting operation mode in which a face image is shot and an ID card is issued. ID number information is required. In this example, the ID number of the employee card applicant 20 is input using the keyboard 13 in addition to the ID number information.
[0077]
A fixed disk drive device (hereinafter simply referred to as HDD) 11 having a predetermined storage capacity is connected to the system bus 28 described above. Reference shooting information is recorded and stored in the reference shooting unit Uj, and in other shooting units Ui. Reference photographing information and chart image information are recorded and saved. The color correction LUT may be recorded on the HDD 11. The face image information D1 converted by the color correction LUT is temporarily recorded in the HDD 11.
[0078]
Further, a monitor 17 is connected to the system bus 28, and when the employee card applicant 20 seated on the chair 19 and the camera 12 of the photographing unit Ui are aligned, the face image of the employee card applicant 20 is monitored. 17 is displayed. The employee card applicant 20 can perform alignment with the camera 12 while looking at the monitor. The officer in charge can display the face image (still image) of the photographed employee card applicant 20 on the monitor 17 and confirm whether or not the photograph is suitable for the employee card photograph.
[0079]
Note that an I / O port 31 having a communication function is connected to the system bus 28. The I / O port 31 may be used to connect to a server device (not shown) through a communication cable such as a LAN or USB, and the face image information D1 acquired and corrected by each photographing unit Ui may be transferred.
[0080]
Next, an internal configuration example of the camera 12 will be described. FIG. 7 is a block diagram illustrating an internal configuration example of the camera 12 in the photographing unit Ui.
[0081]
The camera 12 shown in FIG. 7 is provided with a lens 6 so that incident light L ′ from the object to be imaged is imaged. A diaphragm 5 is attached behind the lens 6, and a diaphragm control unit 25 is mechanically connected to the diaphragm 5. The amount of the light L incident through the lens 6 is adjusted by driving an iris (not shown) of the diaphragm 5 by the diaphragm control unit 25 and changing the opening amount.
[0082]
Further, a CCD image pickup device 21 is provided behind the stop 5 to pick up an image of incident light L ′ from an object to be imaged whose light amount has been adjusted. ) And converted into face image information D1. A color system is adopted for the CCD image sensor 21.
[0083]
A luminance detection unit 23 and an image processing unit 27 are connected to the CCD image sensor 21, and face image information D1 relating to three colors R (red), G (green), and B (blue) obtained from the CCD image sensor 21. Thus, the luminance Y of the specific pixel is detected, or the face image information D1 of these three colors is subjected to known color image processing. In addition, image processing based on framing processing when correcting the face position of the employee card applicant 20 is performed.
[0084]
A camera control unit 24 is connected to the brightness detection unit 23, and aperture control information D4, brightness control information D5, and hue adjustment information D6 for setting camera shooting conditions are input from the CPU 14 of the shooting unit Ui. In the camera control unit 24, the aperture control information D4 is converted from digital to analog, and then the aperture control signal S41 is output to the aperture control unit 25. The aperture controller 25 adjusts the amount of light taken into the CCD image sensor 21 based on the aperture control signal S41. For example, when the iris opening amount of the diaphragm 5 is increased, the light amount increases, and when the iris opening amount is decreased, the light amount decreases.
[0085]
The camera control unit 24 outputs the brightness control signal S51 to the brightness detection unit 23 after the brightness control information D5 is converted from digital to analog. The luminance detector 23 adjusts the amplifier gain and the like based on the luminance control signal S51. A white balance adjustment unit 26 is connected to the camera control unit 24 and the luminance detection unit 23, and white balance adjustment processing is performed on the face image information D1 relating to the R, G, and B colors. For example, after the hue control information D6 is converted from digital to analog in the camera control unit 24, the hue control signal S61 is output to the white balance adjustment unit 26. The white balance adjustment unit 26 adjusts the white balance based on the hue control signal S61. When the above-described face image information D1 is reproduced on the monitor 17 or the like, it is possible to obtain an upper body image of the employee card applicant 20 that balances luminance, hue, and saturation.
[0086]
Here, the camera No. The camera No. of the other photographing unit Ui with the reference photographing information of #j. A method of correcting the #i color correction LUT will be described. FIG. 8 shows the camera No. of another photographing unit Ui. It is a flowchart which shows the example of correction of the color correction LUT in #i.
[0087]
In this example, the camera No. #J is the original device (standard device), and the camera No. of the other photographing unit Ui. When #i is the device to be adjusted, the reference subject 1 is preliminarily placed with three color charts. An optimal matrix is determined using this.
[0088]
Basically, the relative color correction LUT can be obtained by matrix calculation if there is an input / output relationship of three colors. As the color chart at this time, white, skin color, and other colors (for example, blue or green in the background) are optimal. The colors constituting the color chart are preferably selected so as not to be primary dependent. For example, since flesh color and blue have a complementary color relationship, it becomes close to primary dependency and the calculation accuracy deteriorates, but the actual calculation is performed as follows.
[0089]
On the premise of this, first, the camera No. which is set as the reference photographing unit Uj in step B1 of the flowchart shown in FIG. In # 1, the color chart included in the reference subject 1 is photographed. This photographing result data is obtained from the camera No. It is stored in the # 11 HDD 11 or the like. Next, at step B2, the camera No. of the other photographing unit Ui. Take the same color chart in # 2. At this time, the reference subject 1 is set as a reference subject. This photographing result data is obtained from the camera No. It is stored in the HDD 11 # 2.
[0090]
Thereafter, in step B3, a reference photographed image as shown in the wavy circle diagram of FIG. 5 is acquired. The white acquisition region 7A, the skin color acquisition region 8A, and the blue acquisition regions 70A and 70B set in this reference photographed image are acquired. Each color image data is cut out. At this time, the influence of noise can be removed by averaging an area having a certain size in the substantially central portion of the color chart. The position of the color chart is preferably fixed. In this example, the white acquisition region 7A, the skin color acquisition region 8A, and the blue acquisition regions 70A and 70B are automatically recognized according to the color chart, shape, and mark, and these regions are cut out.
[0091]
Thereafter, in step B4, the camera No. # 1 and camera no. The gradation characteristic is made linear with respect to the image data acquired in # 2. In some cases, the output of the camera has a gradation characteristic of 1/2 to the square. In this case, the gradation characteristic is converted into a linear form using a curve of the power of 2.2. For cameras having other characteristics, linear conversion may be performed by actual measurement using a gray chart or the like. At this time, ISO14524: 1999 Photographic-electronic still Picture Cameras-Methods for Measuring Opto-electronic Conversion function (OECFs) can be used.
[0092]
Then, in step B5, using the equations (1) to (6), the camera No. of the other photographing unit Ui. The camera No. 2 in which the RGB value of # 2 is the reference photographing unit Uj. A matrix A to be converted into RGB of # 1 is obtained. When m color charts are used, m = 3 for white, skin color, and blue, and a determinant of 3 rows and 3 columns is obtained. Here, T is a matrix of RGB values for the color chart of the camera # 1, which is the reference photographing unit Uj, and the camera numbers of other photographing units Ui are similarly set. Assuming that the matrix of RGB values for the color chart # 2 is S, the matrix A is calculated by equation (1).
[0093]
[Expression 1]

[0094]
However, the matrix T related to the camera # 1 is calculated by the equation (2), and the camera No. The matrix S related to # 2 is calculated by the equation (3). The matrix elements of camera # 1 are Roi, Goi, and Boi (i = 1 to m, m = 3), and the matrix elements of camera # 2 are Ri, Gi, and Bi (i = 1 to m, m = 3). It is.
[0095]
[Expression 2]

[0096]
Therefore, when the color correction conversion matrix A is obtained, when the RGB value of the camera # 2 is Sk, the RGB value Tk approximated to the camera # 1 can be calculated by the equation (4).
[0097]
Tk = ASk (4)
However, the RGB value Tk related to the camera # 1 is given by equation (5), and the RGB value Sk related to the camera # 2 is given by equation (6).
[0098]
[Equation 3]

[0099]
By using the equations (4) to (6), the color correction LUT is corrected in step B6.
[0100]
In this example, in order to perform color correction conversion at high speed, a method (color correction LUT + interpolation process) in which a color correction LUT is created in advance and the color correction LUT is interpolated is performed rather than performing matrix calculation in real time. Therefore, camera # 1 and camera no. The RGB values related to # 2 are combined with an appropriate interval (for example, 0, 8, 16, 24,..., 248, 255), the values are gradation-converted according to step B4, and the equation (4) is used. Color correction conversion is performed. The result is converted back to the gradation conversion used in step B4.
[0101]
The color correction data obtained by approximating the RGB value of the camera # 2 to the RGB value of the camera # 1 is output by the color correction LUT storing the input / output relationship and the interpolation calculator. For this interpolation calculation, for example, a technique disclosed in Japanese Patent Laid-Open No. 58-123202 can be used. In addition, the matrix calculation result may be negative. In this case, it is preferable to clip to “0”.
[0102]
By using these arithmetic processes, differences in camera #i and lighting environment can be absorbed, and color reproduction of a face image or the like can be stably performed regardless of the shooting location and the shooting unit. The color correction processing is not limited to the case where it is applied between units, and the relative calculation matrix obtained here may be used in combination with the color correction LUT on the printer side. From the input of the image by the employee ID printer 16 or the like to the output of the adjusted color to the thermal printer or the like can be made into one table, the image data processing can be speeded up.
[0103]
In addition, although the case of white, skin color, and blue was demonstrated regarding the color chart, it is not restricted to this. In the case of calculation with these total m = 3 colors, there is a case where the relative in the green / magenta direction is largely generated in the case of primary dependency. In this case, by adding temporary data in the green or magenta direction to the equations (2) and (3), a stable matrix calculation can be performed although the accuracy is slightly reduced. For example, by using the data (R, G, B) = (0, 0.1, 0) in addition to the expressions (2) and (3), an independent relationship is established, and a stable matrix operation can be performed. It becomes possible. Of course, if the color chart creation cost increase is excluded, green data may be added to the color chart in advance.
[0104]
Next, the delivery application form 40 used in the employee card issuing system 100 will be described. The delivery application form 40 shown in FIG. 9 is made of high-quality paper of A4 size, for example. A face photo pasting region P1 is provided at the upper right end, and a face image photo of the employee card applicant 20 is pasted. With regard to the application of the face photo of the employee ID applicant 20, when the application form photo-photoless process is advanced, a device is applied so that the face photo attaching area P1 functions as a face image forming area. The face image of the applicant 20 can be printed.
[0105]
For example, this can be dealt with by forming the face image forming area P1 with an image receiving layer. This image receiving layer is made of a material such as a sublimation dye or a diffusion dye. A face image or the like is formed by fixing on the image receiving layer by applying heat with a thermal head and trapping these dyes.
[0106]
As the material of the image receiving layer, a polymer material such as polyester resin, polyvinyl chloride resin, polyvinyl acetal resin, polyvinyl butyral resin, epoxy resin, acrylic resin can be used. Among them, the polyester resin is preferably used from the viewpoint of environment. The image receiving layer is formed by making these resins into powder and dissolving them in a solvent such as isocyanate, applying the resin with a gravure coater or the like, drying it, and volatilizing the solvent. Of course, an electrophotographic image may be directly formed in the face image forming area P1 of the delivery application form 40 without providing an image receiving layer in the face image forming area P1.
[0107]
In this grant application 40, in addition to the face image forming area P1, there are columns for "employee certificate grant application", "address", "name", "birth date", etc., and a fee stamp. A certificate sticking region P2 to be attached is provided. Therefore, when the system shifts from the facial photo pasting system to the next-generation system, the employee ID applicant 20 does not have to prepare the facial photograph in advance, and only has to fill in the necessary items on the delivery application form 40. It becomes like this.
[0108]
Next, the employee card 30 created by the employee card issuing system 100 will be described. The employee ID 30 shown in FIG. 10 has, for example, a vertical length of about 6 cm, a horizontal length of about 9 cm, and a thickness of about 0.5 to 1.0 mm. When divided, it has a four-layer structure of a card substrate 30A, a top sheet, a protective sheet 51 covering the surface, and a back sheet.
[0109]
Although not shown, one surface of the card substrate 30A is provided with a surface sheet having a thickness of about 100 μm. This surface sheet is a printing member, and image display information is printed in advance on a predetermined region P3 on the surface shown in FIG. The image display information is, for example, “XXX employee ID”, “name”, “issue date”, etc. The printing member is provided with a face image forming area P4 for forming a face image of the employee certificate applicant 20, and the face image forming area P4 forms an image receiving layer. Since this image receiving layer has the same configuration as the image receiving layer in the face image forming area P1 of the delivery application form 40, the description thereof is omitted.
[0110]
A transparent protective sheet 51 is provided on the top sheet, and is protected so as to cover the top sheet. The top sheet and the protective sheet 51 are bonded together via an adhesive sheet. As the adhesive sheet, a hot melt resin or a heat melt resin having a resin softening point temperature of about 100 ° C. or slightly higher is formed in a film shape.
[0111]
On the other surface of the card substrate, a back sheet having a thickness of about 100 μm is provided and has a writing layer that can be written with a pen. The writing layer is obtained by diffusing calcium carbonate and silica fine particles in a polyester emulsion. The writing layer is formed in the same manner as the image-receiving layer of the top sheet by dissolving the above-described material with a solvent, applying it with a gravure coater, etc., and drying to evaporate the solvent. The employee card 30 is also applicable to an electronic card with an IC chip built-in.
[0112]
Next, the employee card printer 16 (corresponding to the card creating means in the claims) of the employee card issuing system 100 will be described. In this example, a case where a sheet-like protective sheet is formed on one raw card board 30 'for an employee card will be described.
[0113]
The employee card printer 16 shown in FIG. 11 has a card supply means 60 and a protective sheet applying unit 50. The card supply means 60 has a first conveyor belt device 41. A raw card supply unit 42 is provided at one upper end of the conveyor belt device 41. In order to write the personal information D2 of the employee card applicant 20 into the raw card supply unit 42, a plurality of raw card boards 30 'for employee cards, which have been cut in a sheet shape in advance, face the face image formation area surface. Stocked towards. In this example, the raw card substrates 30 ′ are automatically supplied one by one from the raw card supply unit 42 so as to be dropped onto the conveyor belt device 41.
[0114]
The raw card substrate 30 ′ on the conveyor belt device 41 after the automatic supply is conveyed from the left side to the right side. An image forming unit (thermal printer) 43 is provided on the conveyor belt device 41, and while the raw card substrate 30 ′ is moved from the left side to the right side, the name of the trader certificate applicant 20 according to the predetermined area P3, The employee certificate issuance date and the like are recorded, and the face image of the trader certificate applicant 20 is formed according to the image forming area P4.
[0115]
A second conveyor belt device 49 is provided on the downstream side of the conveyor belt device 41. In this example, the raw card substrate 30 ′ printed with the personal information D2 is conveyed from the left side to the right side. A protective sheet applying unit 50 is provided on the conveyor belt device 49, and a film-shaped protective sheet 51 is supplied to the raw card substrate 30 '.
[0116]
In this example, the protective sheet 51 includes a laminate film laminated in a sheet shape (cut sheet shape), and the laminate film has an adhesive sheet (not shown) on one surface. Of course, the protective sheet 51 may be a roll of a laminate film.
[0117]
Further, the protective sheet 51 is not limited to a laminate film, and a sheet obtained by winding a hot stamp film in a roll shape or a sheet obtained by laminating a hot stamp film in a cut sheet shape can be used. The protective sheet applying unit 50 is provided with a vacuum hot press device 52, which receives the raw card substrate 30 ′ from the conveyor belt device 41 and the protective sheet 51 from the protective sheet applying unit 50, and the raw card substrate 30 ′ and its The protective sheet 51 is pasted together via an adhesive sheet (not shown). At this time, the paper sheet on the adhesive sheet is peeled off and wound up as a waste paper.
[0118]
The vacuum hot press device 52 has a flat press portion disposed on the conveyance path, and a predetermined pressure is applied from above the protective sheet 51. Therefore, the press part can be moved in the vertical direction. The press section is provided with an electric heater (not shown) so as to heat the protective sheet 51 and the raw card board 30 'to a predetermined temperature.
[0119]
In this example, although depending on the kind of the adhesive sheet, the heating temperature is about 40 ° C. to 120 ° C., and the heating time is about 10 seconds to 120 seconds. This adhesive sheet melts when heat is applied and solidifies when it cools. The apparatus for heating and bonding the protective sheet 51 is not limited to the vacuum hot press apparatus 52, and may be a normal hot press or a heat roller apparatus. Moreover, the cooling part 53 is provided in the downstream of the vacuum hot press apparatus 52, and raw card board | substrate 30 'heat-bonded is cooled. Thereby, the employee ID card 30 protected by the protective sheet 51 is completed.
[0120]
Next, an example of processing in the employee card issuing system 100 will be described. FIG. 12 is a flowchart showing an example of processing in the employee card issuance system 100 as the first embodiment according to the present invention.
[0121]
In this example, the photographing unit U1 is determined as the reference photographing unit, and based on the delivery application form 40 brought by the employee card applicant 20, the face images of a plurality of employee card applicants are taken to the other photographing units U2 to Un. In this case, it is assumed that the employee ID 30 including the face image is issued. It is assumed that the color correction LUT and the reference shooting information are already set for n imaging units U1 to Un in advance.
[0122]
On the premise of this, the standard photographing unit U1 uses the scanner SC1 in step C11 of the flowchart of FIG. 12 to read the delivery application form 40 of the employee card applicant, and personal identification information of the employee card applicant ID and personal information D21 are acquired. Here, the personal information D21 refers to the name, date of birth, current address, permanent address, registration information relating to the seal registered earlier, and the like of the employee certificate applicant.
[0123]
Thereafter, the process proceeds to step C12, where the face image of the employee card applicant 20 is photographed by the photographing unit U1, and the face image information D11 is acquired. In step C13, the face image information D11 of the employee card applicant 20 is color-corrected by the corrected color correction LUT. Then, the process proceeds to step C4.
[0124]
In parallel with this, in the photographing unit U2, the delivery application form 40 of another employee card applicant is read using the scanner SC2 in step C21, and the personal identification information ID and personal information D22 of the employee card applicant are read. Is acquired. Thereafter, the process proceeds to step C22, and the face image of the employee card applicant is photographed using the photographing unit U2, and the face image information D12 is obtained. In step C23, the face image information D12 of the employee certificate applicant is corrected by the corrected color correction LUT. Then, the process proceeds to step C4.
[0125]
Similarly, in the photographing unit Un, the delivery application form 40 of another employee card applicant is read using the scanner SCn in step Cn1, and the personal identification information ID and personal information D2n of the employee card applicant are obtained. Is done. Thereafter, the process proceeds to step Cn2, and the face image of the employee card applicant is photographed using the photographing unit Un, and the face image information D1n is obtained. In step Cn3, the face image information D1n of the employee certificate applicant is corrected by the corrected color correction LUT.
[0126]
Thereafter, the process proceeds to step C4 where the employee card printer 16 includes the employee card 30 including the face image based on the face image information D1 to D1n, personal identification information ID, and personal information D21 to D2n of the employee card applicant. Is created. Thereafter, the process proceeds to step C5, where it is determined whether or not all the employee ID cards 30 have been issued. The determination at this time is determined by the person in charge depending on, for example, whether the working hours of the day have ended and whether the employee certificate of the last employee certificate applicant has been issued. Therefore, if all the employee ID cards 30 containing face images have not been issued in step C5, the process returns to step C4 and the above-described processing is repeated.
[0127]
Thus, according to the employee card issuance system 100 as the first embodiment of the present invention, the face images of a plurality of employee card applicants are divided and shot by the n shooting units U1 to Un. In this case, an output image obtained by color-correcting the face image of the employee ID applicant acquired by the imaging units U2 to Un other than the reference imaging unit U1 and the face image of the employee ID applicant acquired by the reference imaging unit U1 are obtained. The color corrected output image can be aligned.
[0128]
Therefore, even if the photographing conditions such as illumination light and environmental temperature vary among the photographing units U1 to Un, the optimally adjusted employee card printer 16 is adjusted to the photographing units U1 to Un each time. The employee ID 30 with a high-quality face image can be created.
[0129]
(3) Example 2
FIG. 13 is a flowchart showing a processing example in the employee card issuing system 100 ′ as the second embodiment according to the present invention.
[0130]
In this example, it is assumed that the photographing unit U2 has no function for correcting the color correction LUT, and this correction is performed by the employee card printer 16. Other processing conditions are the same as those in the first embodiment.
[0131]
On the premise of this, the reference photographing unit U1 uses the scanner SC1 in step E11 of the flowchart of FIG. 13 to read the delivery application form 40 of the employee card applicant, and personal identification information of the employee card applicant ID and personal information D21 are acquired. Thereafter, the process proceeds to step E12, where the face image of the employee card applicant 20 is photographed by the photographing unit U1, and the face image information D11 is acquired. In step E13, the face image information D11 of the employee card applicant 20 is corrected by the color correction LUT based on the reference. Thereafter, the process proceeds to step E4.
[0132]
In parallel with this, in the photographing unit U2, in step E21, the delivery application form 40 of another employee card applicant is read using the scanner SC2, and the personal identification information ID and personal information D22 of the employee card applicant are read. Is acquired. Thereafter, the process proceeds to step E22, and the face image of the employee card applicant is photographed using the photographing unit U2, and the face image information D12 is obtained. In this example, since the photographing unit U2 does not have a correction function, the process proceeds to step E4.
[0133]
The other photographing units Un are provided with a correction function. Accordingly, in step En1, the delivery application form 40 of another employee card applicant is read using the scanner SCn, and the personal identification information ID and personal information D2n of the employee card applicant are obtained. Thereafter, the process proceeds to step En2, and the face image of the employee card applicant is photographed using the photographing unit Un, and the face image information D1n is acquired. In step En3, the face image information D1n of the employee certificate applicant is corrected by the corrected color correction LUT.
[0134]
Thereafter, the process proceeds to step E4 where the employee ID printer 16 reads the header information and checks the flag to determine whether or not the color correction LUT needs to be corrected. In this example, since the photographing units U1, U3 to Un other than the photographing unit U2 do not require correction of the color correction LUT in the employee card printer 16, the process proceeds to step E6.
[0135]
In the case of using the photographing unit U2, the process proceeds to step E5 where the color correction LUT in the employee card printer 16 is corrected. The employee ID printer 16 corrects the face image information D12 based on the chart image information. For example, the relative value is calculated by obtaining a difference (relative value) between the standard captured image information acquired by the standard capturing unit U1 and the reference captured image information (chart captured information) acquired by the capturing unit U2. The color correction LUT is shifted so as to exclude minutes.
[0136]
And it transfers to step E6 and the employee ID 30 containing a face image is produced based on the face image information D11-D1n of the said employee ID applicant, personal identification information ID, and personal information D21-D2n.
. Thereafter, the process proceeds to step E7, where it is determined whether or not all the employee ID cards 30 have been issued. The determination at this time is determined by the person in charge depending on, for example, whether the working hours of the day have ended and whether the employee certificate of the last employee certificate applicant has been issued. Therefore, if all the employee ID cards 30 containing face images have not been issued in step E7, the process returns to step E4 and the above-described processing is repeated.
[0137]
As described above, according to the employee card issuing system 100 ′ as the second embodiment of the present invention, the face images of a plurality of employee card applicants are shared by the n shooting units U1 to Un. Color correction of the face image of the employee card applicant obtained by the photographing units U1, U3 to Un other than the photographing unit U2, even when the photographing units U2 having no correction function of the color correction LUT are mixed. And the output image obtained by color-correcting the face image of the employee certificate applicant acquired by the photographing unit U2.
[0138]
Therefore, even when the photographing conditions such as illumination light and environmental temperature vary among the photographing units U1 to Un, the employee card printer 16 creates the employee card 30 with a high-quality face image. Can do. In these embodiments, the case of the employee card 30 is described with respect to the ID card. However, the present invention is not limited to this, but a cash card, employee card, membership card, student card, identification card, alien registration card and various driving It can also be applied to licenses.
[0139]
(3) Third embodiment
Next, another embodiment of the color correction method in the ID photo system according to the present invention will be described.
[0140]
FIG. 14 is a diagram illustrating a configuration example of an ID card creation system.
[0141]
The system in this embodiment includes a photographing device for photographing a subject, a color correction conversion device that performs color correction on image information obtained by the photographing device (hereinafter sometimes referred to as image data for convenience), and It is composed of an ID card printer that creates an ID card based on color-corrected image data.
[0142]
1) Imaging device
The photographing apparatus is a photographing apparatus (direct type photographing for acquiring image data by directly photographing a subject (a person having a face image attached to an ID card in the present embodiment) directly with a video camera or the like. Device) and a photographing device (indirect photographing device) for obtaining image data by indirectly photographing a face photograph attached to an application form for creating an ID card with a video camera or the like. .
[0143]
In the present invention, the same effect can be obtained by any of the above-described photographing methods. Therefore, in this embodiment, either a direct type or an indirect type will be described as a photographing apparatus.
[0144]
In the system described in the present embodiment, a plurality of photographing devices (photographing devices A to C) are provided, which corresponds to preset reference photographing image information (specifically, color chart photographing image data described later). As long as the color of the photographed image is corrected based on (), one or more may be provided.
[0145]
The image data (corresponding to the photographed image information in the claims) acquired by the photographing apparatus may be analog image data or digital data depending on the type of camera constituting the photographing apparatus, which will be described later. In order to perform color correction in the color conversion device, digital data is preferable. However, even if the image data is analog image data, the digital image data can be transmitted to the color conversion device by passing through an A / D conversion device (device for converting from analog to digital) (not shown). For this reason, the photographing apparatus may be any apparatus that can photograph a subject (regardless of analog or digital) and transmit image data to the outside, and a video camera or a digital camera (electronic camera) can be used.
[0146]
Further, it is preferable that the image capturing apparatus appends ID number information corresponding to image information (corresponding to the object) to the image data when capturing a plurality of different subjects and a plurality of different images. ID number information is added to the data and the color-corrected image data. In the color conversion device, the image to be subjected to color correction is specified. In the ID card printer described later, information related to printing (finished image information, print It is used for feedback and filing of historical information.
[0147]
The ID number information corresponds to information (information for specifying a subject, information for specifying photographed image information, information for specifying a photographing device, etc.) required for creating an ID card, and a number for identifying them. In this embodiment, ID number information is used as information for specifying a subject, for example, information for specifying information on a description item (name, address, etc.) described on an ID card. Further, in this embodiment, information for specifying the photographing device is attached to the photographed image data as a photographing device identification code, but this photographing device identification code may be handled as ID number information.
[0148]
Further, when a normal photographing mode for photographing a subject by the photographing device and a color correction conversion table creation mode for creating the color correction conversion table corresponding to the photographing device are provided, the ID number information is set. By setting according to the mode, it is possible to adjust the shooting image quality according to each mode (for example, in the color correction conversion table creation mode, the input / output information amount for one image is larger than that in the normal shooting mode). Color correction with higher accuracy is possible. In addition, troubles such as confusion with normal shooting do not occur for the user.
[0149]
2) Color conversion device
In this color conversion device, based on preset reference photographic image information (specifically, corresponding to color chart photographic image data) and photographic image information acquired by each photographic device, each photographic device is provided. A corresponding color correction conversion table can be created.
Therefore, the color correction conversion table creation procedure will be described.
[0150]
1. The color conversion device standardizes image data output to an ID card printer and display means (monitor) regardless of the photographing device. For example, when a captured image captured by a plurality of imaging devices is displayed on a display device as in this embodiment, image data is output so that the same image is displayed on any captured image captured by any of the imaging devices. To do.
[0151]
ID number information, photographing device identification code, color chart photographed image data (reference photographed image information), and actual image data are transmitted from the photographing device to the color conversion device. When creating the color correction conversion table, the actual image data becomes reference captured image information (image information acquired by capturing the above-described reference subject).
[0152]
Here, the color chart photographed image data is, for example, image data obtained by photographing the reference subject described in the first embodiment with a specific photographing apparatus, but if it is sufficient for calculating a standardized matrix described later. Only measured values may be used as color chart photographed image data without photographing.
[0153]
Note that color chart photographed image data (reference photographed image information) may not be transmitted. This is because the color chart photographed image data obtained by photographing the color chart at a timing different from the timing of creating the color correction conversion table may be transmitted to the color conversion apparatus and stored as an image file. is there.
2. The color conversion device performs tone conversion to linearize the tone characteristics (γ characteristics) for each of the color chart photographed image data and the actual image data corresponding to the photographing device identification code, and then compares the tone characteristics to compare the tone characteristics. A standardization matrix (corresponding to a relative value in the claims) is calculated.
[0154]
In this embodiment, the gradation characteristics are linearly converted in order to obtain a standardized matrix. However, these operations are for improving the accuracy of color correction and are not essential operations.
[0155]
Note that the standardized matrix can be obtained using equations (1) to (3) in the same manner as the matrix A described in step B5 in the first embodiment. In this case, T in the equation is a matrix of RGB values for the color chart photographed image data, and S corresponds to an RGB matrix for the actual image data.
[0156]
3. Using the standardized matrix (matrix A) obtained as described above, a color correction conversion table (matrix R) corresponding to the imaging device identification code stored in the memory in the system is expressed by the following equation (7). Then, the corrected color correction conversion table (matrix R ′) is calculated.
[0157]
R ′ = A · R −−−−− (7)
In this way, the color correction conversion table R ′ corresponding to each photographing apparatus can be created.
[0158]
Using this created color correction conversion table, captured image information (actual image data that is not reference captured image information) acquired by each imaging device is used as an image by an ID card printer or an image on a display device (monitor). However, color correction can be performed so that the image quality is uniform for all photographing apparatuses. Further, the created color correction conversion table can be stored in the memory and the color correction conversion table corresponding to the photographing apparatus identification code can be updated. However, it is preferable to store the color correction conversion table separately as a new color correction conversion table.
[0159]
3) ID card printer
The image data corrected by the color conversion device and the ID number information are transmitted to the ID card printer in a state of being associated with each other. Further, a plurality of ID card printers may be provided in the system from the viewpoint of improving the ID card creation speed. In this case, even if the image data transmitted to each ID card printer is standardized by the color conversion device, it is necessary to adjust the print image to a preferable image depending on the characteristics of the individual ID card printer. May be provided with color conversion means for color correction of the transmitted image data.
[0160]
In the case where information related to items to be written on the ID card is associated with the image data as with the ID number information, an ID card can be created based on the information, but only the ID number information is transmitted. If the information related to the item to be described is stored in the storage means (the installation location is arbitrary), the information related to the description item to be described is searched from the storage means using the ID number information as search information, and the image data and the search are performed. An ID card can be created on the basis of the information thus obtained.
[0161]
Further, a plurality of ID card printers may be provided in the system from the viewpoint of improving the ID card creation speed. In that case, even if the image data transmitted to each ID card printer is standardized by the color conversion device, it is necessary to adjust the print image to optimize it to a preferable image depending on the characteristics of the individual ID card printer. The ID card printer may be provided with color conversion means to perform color correction on the transmitted image data.
[0162]
Further, when the color chart photographed image data (reference photographed image information) is stored in advance in a storage means provided in the ID card printer, a color correction conversion table creation procedure performed by the color conversion means by the color conversion device; Similarly, color correction can be performed on the captured image.
[0163]
The color correction conversion table creation procedure will be described below.
1. ID number information, a photographing device identification code, and actual image data (reference photographed image information) are transmitted from the photographing device to the ID card printer.
2. Color conversion means (not required to be built in) provided in the ID card printer linearizes the gradation characteristics (γ characteristics) for each of the color chart photographed image data and the actual image data corresponding to the photographing apparatus identification code. After that, the two are compared to calculate a standardized matrix of gradation characteristics (corresponding to a relative value in the claims).
[0164]
The operation of linearizing the gradation characteristic is for improving the accuracy of color correction, and is not an essential operation.
[0165]
Note that the standardized matrix can be obtained using equations (1) to (3) in the same manner as the matrix A described in step B5 in the first embodiment. In this case, T in the equation is a matrix of RGB values for the color chart photographed image data, and S corresponds to an RGB matrix for the actual image data.
[0166]
3. Using the standardized matrix (referred to as matrix A) obtained as described above, a color correction conversion table (referred to as matrix R) stored in the memory in the system and corresponding to the imaging device identification code is expressed by the above-described equation (7). And a corrected color correction conversion table (referred to as matrix R ′) is calculated.
[0167]
In this way, the color correction conversion table R ′ corresponding to each photographing apparatus can be created.
[0168]
Since the created color correction conversion table corresponds to the photographing apparatus and the ID card printer, the photographed image information (actual image data that is not the reference photographed image information) acquired by each photographing apparatus using the photographing apparatus and the ID card printer is used. Color correction can be performed so that an image obtained by an ID card printer has an equal image quality for all photographing apparatuses.
[0169]
FIG. 15 is a configuration diagram when the function of the color conversion apparatus described in FIG. 14 is included in the photographing apparatus. Even with such a configuration, the same effect as the embodiment described in FIG. 14 can be obtained. Further, since it is not necessary to provide a separate color conversion device, the size of the entire system can be reduced.
[0170]
【Effect of the invention】
As described above, according to the ID card creation system and the color correction method in the system according to the present invention, the color correction of the photographed image acquired by the photographing apparatus is performed based on the preset reference photographed image information. Since the color correction conversion table corresponding to the photographing device can be created by the color correction method, the reference photographed image information set in advance is assumed even when a plurality of photographing devices are installed. Based on the above, it is possible to effectively suppress variations in the output image regardless of the shooting conditions.
[0171]
In addition, by setting a reference photographing device and photographing a reference photographing subject with the reference photographing device, it is possible to acquire reference photographing image information, and therefore, when a plurality of photographing devices are installed, which photographing device is used as a reference. Regardless of whether or not the photographing apparatus is used, variations in the output images can be suppressed. For this reason, it is possible to easily adjust the output image even for users who do not have special knowledge.
[0172]
In particular, when a normal shooting mode and a color correction conversion table creation mode are provided, it is possible to adjust the shooting image quality according to each mode (for example, one image in the color correction conversion table creation mode). Therefore, more accurate color correction can be performed. In addition, troubles such as confusion with normal shooting do not occur for the user.
[0173]
In addition, with this configuration, an output image obtained by performing color correction on the face image of the subject acquired by a photographing device other than the reference photographing device, and an output image obtained by performing color correction on the face image of the subject obtained by the reference photographing device. Can be aligned. Therefore, even if photographing conditions such as illumination light and environmental temperature vary among the photographing devices, a high-quality face image can be obtained with any photographing device.
[0174]
According to the ID card creation system of the present invention, when creating an ID card with a face image, one of a plurality of photographing devices is defined as a reference photographing device, and the reference photographing image acquired by the reference photographing device is used. When performing color correction of a captured image acquired by an imaging device other than the reference imaging device based on the output image obtained by color-correcting the face image of the subject acquired by an imaging device other than the reference imaging device, and a reference It is possible to align with the output image obtained by color-correcting the face image of the photographed person acquired by the photographing apparatus. Therefore, even when the photographing conditions such as illumination light and environmental temperature vary among the photographing devices, it is possible to create an ID card with a high-quality face image.
[0175]
This invention includes licenses such as automobile licenses, identification card, passport, alien registration card, library card, cash card, credit card, employee ID card, employee ID card, membership card, medical card, student ID card, etc. The present invention is very suitable when applied to an ID card creation system for an ID card.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration example of an ID card creation system 10 to which a color correction method according to an embodiment of the present invention is applied.
FIG. 2 is a flowchart showing an example of color correction in the ID card creation system 10;
FIG. 3 is a block diagram showing a configuration example of an employee card issuing system 100 as each embodiment according to the present invention.
FIG. 4 is an image diagram illustrating a shooting example when correcting a color correction LUT.
FIG. 5 is an enlarged view showing a setting example of the information acquisition area.
FIG. 6 is a block diagram illustrating a configuration example of a photographing unit Ui.
7 is a block diagram showing an example of the internal configuration of a camera 12. FIG.
FIG. 8 shows a camera No. designated as the reference photographing unit Uj. It is a flowchart which shows the example of correction of the color correction LUT in #j.
FIG. 9 is an image diagram showing a configuration example of an employee certificate grant application 40;
FIG. 10 is an image view showing a configuration example of an employee card 30;
FIG. 11 is a conceptual diagram illustrating a configuration example of an employee card printer 16;
FIG. 12 is a flowchart showing an example of processing in the employee card issuance system 100 as the first embodiment (embodiment 1);
FIG. 13 is a flowchart showing a processing example in an employee card issuance system 100 ′ as a second embodiment (embodiment 2).
FIG. 14 is a configuration diagram of an ID card creation system as a third embodiment (part 1);
FIG. 15 is a configuration diagram of an ID card creation system as a third embodiment (part 2);
FIG. 16 is a configuration diagram of an ID card creation system as a third embodiment (part 3);
[Explanation of symbols]
1 Reference subject
7 White plate
8 skin color board
10 ID card making system
11 Fixed disk drive (HDD)
12 Camera
13 Input tools
14 CPU (control device)
15 EEPROM
16 Employee ID printer (ID card creation means)
17 Monitor
18 Light source
24 Camera control unit
30 Employee ID (ID card)
35 Server device
36 database
40 grant application
70 background board

Claims (14)

ID card creation characterized in that color correction of a photographed image acquired by the photographing device is performed based on reference photographed image information obtained by photographing a reference subject including white, flesh color and background board color by the reference photographing device A color correction method in a system,
The reference photographing image information is acquired by photographing a reference subject including white, flesh color and background board color with the photographing device,
Comparing the reference photographed image information and the standard photographed image information to calculate a relative value,
Create a color correction conversion table corresponding to the imaging device based on the relative value,
A color correction method in an ID card creation system, wherein color correction of the captured image acquired by the imaging apparatus is performed using the color correction conversion table. The color correction conversion table corresponding to the photographing apparatus is
Capture a reference subject with the imaging device to obtain reference captured image information,
Comparing the reference photographed image information and the standard photographed image information to calculate a relative value,
2. The color correction method in the ID card creation system according to claim 1, wherein the color correction method is created by correcting a color correction conversion table corresponding to the reference photographed image information based on the relative value. The color correction conversion table corresponding to the photographing apparatus is
Capture a reference subject with the imaging device to obtain reference captured image information,
Comparing the reference photographed image information and the standard photographed image information to calculate a relative value,
2. The color correction method in the ID card creation system according to claim 1, wherein the color correction conversion table is created by correcting a color correction conversion table corresponding to the reference photographing device based on the relative value.   The normal photographing mode for photographing a person to be photographed by the photographing device and the color correction conversion table creation mode for creating the color correction conversion table corresponding to the photographing device are provided. 4. A color correction method in the ID card making system according to any one of 3 above.   5. The color correction method in the ID card creation system according to claim 4, wherein dedicated ID number information is set in executing the color correction change table creation mode. An ID card creation system for creating an ID card to which at least a part of an image of a subject is attached,
A photographing device for obtaining photographed image information based on a photographed image obtained by photographing at least a part of the subject;
A card creating means for creating an ID card attached with at least a part of the image of the subject based on the photographed image information;
The reference photographing image information is acquired by photographing a reference subject including white, flesh color and background board color with the photographing device,
Comparing the reference photographed image information with reference photographed image information acquired by photographing a standard subject including white, skin color, and background plate color by a standard photographing device to calculate a relative value;
Create a color correction conversion table corresponding to the imaging device based on the relative value,
An ID card creation system, wherein the photographed image is color-corrected using the color correction conversion table. The color correction conversion table corresponding to the photographing apparatus is
Capture a reference subject with the imaging device to obtain reference captured image information,
Comparing the reference photographed image information and the standard photographed image information to calculate a relative value,
The ID card creation system according to claim 6, wherein the ID card creation system is created by correcting a color correction conversion table corresponding to the reference photographing apparatus based on the relative value.   7. The ID card creation system according to claim 6, wherein the reference image information is provided in the card creation means. Capture a reference subject with the imaging device to obtain reference captured image information,
Comparing the reference photographed image information and the standard photographed image information to calculate a relative value,
Based on the relative value, create a color correction conversion table corresponding to the imaging device and the card creation means,
Color-correcting the captured image information using the color correction conversion table;
9. The ID card creation system according to claim 8 , wherein an ID card attached with at least a part of an image of the subject is created based on the color-corrected photographed image information. The color correction conversion table corresponding to the photographing device and the card creating means is:
Capture a reference subject with the imaging device to obtain reference captured image information,
Comparing the reference photographed image information and the standard photographed image information to calculate a relative value,
10. The ID card creation system according to claim 9 , wherein the ID card creation system is created by correcting a color correction conversion table corresponding to the reference image information based on the relative value. 11. The ID card creation system according to claim 10 , wherein a color correction conversion table corresponding to the reference image information is provided in the card creation means. A normal photographing mode for photographing a subject by the photographing device and a color correction conversion table creation mode for creating the color correction conversion table corresponding to the photographing device and the card creating means are provided. The ID card creation system according to any one of claims 9 to 11 . 13. The ID card creation system according to claim 12 , wherein dedicated ID number information is set in executing the color correction change table creation mode. The ID card creation system according to any one of claims 6 to 13 , wherein an ID card with an image including a face of a photographed person is created.

Images