JPS6246038B2 - - Google Patents
Info
- Publication number
- JPS6246038B2 JPS6246038B2 JP55169295A JP16929580A JPS6246038B2 JP S6246038 B2 JPS6246038 B2 JP S6246038B2 JP 55169295 A JP55169295 A JP 55169295A JP 16929580 A JP16929580 A JP 16929580A JP S6246038 B2 JPS6246038 B2 JP S6246038B2
- Authority
- JP
- Japan
- Prior art keywords
- character string
- processing method
- recognition processing
- written
- line spacing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V30/00—Character recognition; Recognising digital ink; Document-oriented image-based pattern recognition
- G06V30/10—Character recognition
- G06V30/18—Extraction of features or characteristics of the image
- G06V30/186—Extraction of features or characteristics of the image by deriving mathematical or geometrical properties from the whole image
- G06V30/187—Frequency domain transformation; Autocorrelation
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V30/00—Character recognition; Recognising digital ink; Document-oriented image-based pattern recognition
- G06V30/10—Character recognition
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Algebra (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Mathematical Physics (AREA)
- Pure & Applied Mathematics (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Multimedia (AREA)
- Theoretical Computer Science (AREA)
- Character Input (AREA)
Description
【発明の詳細な説明】
本発明は、文字列認識処理方式、特に自動的に
文字を読み取る装置において、記述されている文
字列を認識すべく、印刷物から読取つた画像情報
に対してフーリエ変換を行なつて文字列の存在を
認識するようにした文字列認識処理方式に関する
ものである。DETAILED DESCRIPTION OF THE INVENTION The present invention uses a character string recognition processing method, particularly in an automatic character reading device, to perform Fourier transform on image information read from printed matter in order to recognize written character strings. The present invention relates to a character string recognition processing method that recognizes the existence of a character string by performing the following steps.
従来、文字列を認識するに当つては、画面をス
キヤンし、第１図図示の如く例えばそのスキヤン
方向に濃度のヒストグラムを作成し、行間隔を認
識していた。なお図中の符号１は入力画像、２は
作成されたヒストグラムを表わしている。しかし
この構成の場合には、第２図図示の如く、入力画
像１が傾むいた場合や図や写真が混在している場
合には、第２図図示ヒストグラム２の如く文字列
を認識しにくいという欠点があつた。 Conventionally, in order to recognize a character string, a screen was scanned, and a density histogram was created in the scan direction, as shown in FIG. 1, for example, to recognize the line spacing. Note that the reference numeral 1 in the figure represents an input image, and the reference numeral 2 represents a created histogram. However, in the case of this configuration, if the input image 1 is tilted as shown in Figure 2, or if figures and photographs are mixed, it is difficult to recognize the character string as shown in histogram 2 of Figure 2. There was a drawback.
本発明は、これらの欠点を解決するため、画面
の濃淡情報を空間的２次元フーリエ変換を行な
い、そのフーリエ変換された情報をもとに文字列
を認識することを目的としており、以下図面につ
いて詳細に説明する。 In order to solve these drawbacks, the present invention aims to perform spatial two-dimensional Fourier transform on the gray scale information on the screen and recognize character strings based on the Fourier transformed information. Explain in detail.
ｆ（ｘ，ｙ）を入力された画像の濃度分布とす
るとき、空間周波数成分ｇ（ωx、ωy）は次のよ
うに表わすことができる。 When f(x, y) is the density distribution of the input image, the spatial frequency component g(ω x , ω y ) can be expressed as follows.
ｇ（ωx、ωy）＝∫∫（ｘ，ｙ） ｅ-i(〓x g(ω x , ω y )=∫∫(x, y) e -i( 〓 x
Claims (1)
て当該記述された文字列を認識する文字列認識処
理方式において、処理すべき画面の濃淡情報を空
間的２次元フーリエ変換を行ない、該フーリエ変
換された平面において上記２次元フーリエ変換さ
れた情報から原点に近いピークを見い出すことに
より文字列の行間隔を求め、該行間隔にそつてス
キヤンを行うことにより文字列を認識することを
特徴とする文字列認識処理方式。1 In a character string recognition processing method that scans a character string on a printed matter in which characters are written and recognizes the written character string, the gray scale information on the screen to be processed is subjected to a spatial two-dimensional Fourier transform, The line spacing of a character string is determined by finding a peak near the origin from the two-dimensional Fourier transformed information on the transformed plane, and the character string is recognized by scanning along the line spacing. String recognition processing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55169295A JPS5793484A (en) | 1980-12-01 | 1980-12-01 | Recognizing and processing system of character-string |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55169295A JPS5793484A (en) | 1980-12-01 | 1980-12-01 | Recognizing and processing system of character-string |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5793484A JPS5793484A (en) | 1982-06-10 |
| JPS6246038B2 true JPS6246038B2 (en) | 1987-09-30 |
Family
ID=15883865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55169295A Granted JPS5793484A (en) | 1980-12-01 | 1980-12-01 | Recognizing and processing system of character-string |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5793484A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5827278A (en) * | 1981-08-10 | 1983-02-17 | Toshiba Corp | Line searching system |
-
1980
- 1980-12-01 JP JP55169295A patent/JPS5793484A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5793484A (en) | 1982-06-10 |
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