JPH0325995B2 - - Google Patents
Info
- Publication number
- JPH0325995B2 JPH0325995B2 JP6453286A JP6453286A JPH0325995B2 JP H0325995 B2 JPH0325995 B2 JP H0325995B2 JP 6453286 A JP6453286 A JP 6453286A JP 6453286 A JP6453286 A JP 6453286A JP H0325995 B2 JPH0325995 B2 JP H0325995B2
- Authority
- JP
- Japan
- Prior art keywords
- skin color
- coefficient
- circuit
- signals
- digital
- 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
Landscapes
- Processing Of Color Television Signals (AREA)
Description
【発明の詳細な説明】
発明の目的
産業上の利用分野
本発明は、カラーテレビジヨン受像機内で使用
される肌色補正機能を備えたデイジタル・マトリ
クス回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a digital matrix circuit with skin color correction for use in color television receivers.
従来の技術
NTSCカラーテレビジヨン方式では、通常、色
信号を復調するための復調器においてＲ−Ｙ，Ｂ
−Ｙ軸復調方式が採用され、これをＲ，Ｇ，Ｂ信
号（又はそれぞれとＹ信号との差）に変換するた
めのマトリクス回路が設置される。Prior Art In the NTSC color television system, a demodulator for demodulating color signals usually uses R-Y, B
- A Y-axis demodulation method is adopted, and a matrix circuit is installed to convert this into R, G, and B signals (or the difference between each and the Y signal).
またNTSC方式で規定される特性の蛍光体や基
準白色をもつ受像管を使用する場合には、送信側
のエンコーダと逆の特性を持たせたNTSC復調器
を受像機内に設置することによつて良好な色再現
が達成できる。しかしながら実際には、NTSC方
式で規定される特性の蛍光体や基準白色とは異な
るものが使用される場合が多い。そこで、良好な
色再現を行うために、復調軸と復調利得をNTSC
エンコーダの場合から変更する補正が行われる。
このような補正は、視覚の最も敏感な肌色を基準
として行われるのが一般的であり、このため肌色
補正と称されている。 Furthermore, when using a picture tube with phosphor or reference white color that has the characteristics specified by the NTSC system, it is possible to Good color reproduction can be achieved. However, in reality, phosphors with characteristics that are different from those specified in the NTSC system and materials that differ from the reference white color are often used. Therefore, in order to achieve good color reproduction, the demodulation axis and demodulation gain are set to NTSC.
Corrections are made to change from the encoder case.
Such correction is generally performed based on skin color, which is the most visually sensitive, and is therefore called skin color correction.
発明が解決しようとする問題点
最近、Ｙ／Ｃ分離前の複合映像信号をデイジタ
ル信号に変換し、デイジタル信号処理技術を駆使
してＹ／Ｃ分離、雑音の除去、輪郭補正、走査線
補間による高密度表示など各種の画質改善を図る
デイジタル・テレビジヨン受像機が開発されつつ
ある。通常、アナログ複合映像信号をデイジタル
複合映像信号に変換するＡ／Ｄ変換回路では、色
副搬送波周波数（fsc）の４倍の周波数でサンプ
リングが行われる。Problems to be Solved by the Invention Recently, a composite video signal before Y/C separation is converted into a digital signal, and digital signal processing technology is used to perform Y/C separation, noise removal, contour correction, and scanning line interpolation. Digital television receivers are being developed to improve image quality in various ways, such as high-density display. Typically, in an A/D conversion circuit that converts an analog composite video signal into a digital composite video signal, sampling is performed at a frequency four times the color subcarrier frequency ( fsc ).
このようなデイジタル方式に、従来のアナログ
方式における肌色補正の手法を踏襲しようとすれ
ば、復調軸を90度以下の範囲でずらすことが必要
になる。このことは、サンプリング点ごとにサン
プリングのタイミングを前後に少しずつずらすこ
とを意味し、Ａ／Ｄ変換回路とその後段の画質改
善回路の構成が極めて複雑・高価になるという問
題がある。 If such a digital system were to follow the skin color correction method used in the conventional analog system, it would be necessary to shift the demodulation axis within a range of 90 degrees or less. This means that the sampling timing is slightly shifted back and forth for each sampling point, which poses a problem in that the configuration of the A/D conversion circuit and the subsequent image quality improvement circuit becomes extremely complex and expensive.
発明の構成
問題点を解決するための手段
本発明に係わる肌色補正機能を備えたデイジタ
ル・マトリクス回路は、それぞれが択一可能な複
数種類の係数器から成る複数の係数回路と、これ
ら係数回路の出力を加算する複数の加算器を備
え、デイジタル映像信号のＹ，Ｒ−Ｙ及びＢ−Ｙ
信号を肌色補正しつつＲ，Ｇ，Ｂ信号に変換する
ことにより、補正範囲に融通性をもたせるための
多少係数器をマトリクス回路に付加しつつ肌色補
正のためだけの回路を不要にしてしまうように構
成されている。Means for Solving the Problems in the Structure of the Invention A digital matrix circuit with a skin color correction function according to the present invention includes a plurality of coefficient circuits each consisting of a plurality of types of coefficient units that can be selected from, and Equipped with a plurality of adders that add the outputs, Y, R-Y and B-Y of the digital video signal
By converting the signal into R, G, and B signals while correcting the skin color, it is possible to add some coefficients to the matrix circuit to provide flexibility in the correction range, while eliminating the need for a circuit just for skin color correction. It is composed of
以下、本発明の作用を実施例と共に詳細に説明
する。 Hereinafter, the operation of the present invention will be explained in detail together with examples.
実施例
第１図は、本発明の一実施例に係わる肌色補正
機能を備えたデイジタル・マトリクス回路の構成
を示すブロツク図である。Embodiment FIG. 1 is a block diagram showing the configuration of a digital matrix circuit having a skin color correction function according to an embodiment of the present invention.
このデイジタル・マトリクス回路は、肌色補正
マトリクス回路１０と、色信号変換回路２０と、
遅延回路３１乃至３３と、切り換えスイツチ３
４，３５を備えている。 This digital matrix circuit includes a skin color correction matrix circuit 10, a color signal conversion circuit 20,
Delay circuits 31 to 33 and changeover switch 3
It is equipped with 4,35.
肌色補正マトリクス回路１０は、入力されたデ
イジタルＹ，Ｒ−Ｙ，Ｂ−Ｙ信号を肌色補正しつ
つデイジタルＲ，Ｇ，Ｂ信号に変換する。 The skin color correction matrix circuit 10 converts the input digital Y, RY, BY signals into digital R, G, B signals while correcting the skin color.
前段のＡ／Ｄ変換回路においてＩ，Ｑ復調に相
当するサンプリング位相でデイジタル化が行われ
た場合には、スイツチ３４と３５の切り換えによ
り、色信号変換回路でＲ−ＹとＢ−Ｙ信号に変換
されたのち、肌色補正マトリクス回路１０に供給
される。遅延回路３１乃至３３は、ここを通過す
る信号に色信号変換回路２０で生ずる遅延時間に
等しい遅延時間を与える。 When digitization is performed at the sampling phase corresponding to I and Q demodulation in the A/D conversion circuit in the previous stage, the color signal conversion circuit converts the R-Y and B-Y signals by switching switches 34 and 35. After being converted, it is supplied to the skin color correction matrix circuit 10. The delay circuits 31 to 33 give a delay time equal to the delay time generated in the color signal conversion circuit 20 to the signals passing through them.
肌色補正マトリクス回路１０は、第２図に示す
ように、６個の係数回路１１乃至１６と、これら
係数回路の出力を加算する３個の加算器１７ａ乃
至１７ｃと、これら加算器の出力とＹ信号とを加
算する３個の加算器１８ａ乃至１８ｃを備えてい
る。 As shown in FIG. 2, the skin color correction matrix circuit 10 includes six coefficient circuits 11 to 16, three adders 17a to 17c that add the outputs of these coefficient circuits, and the outputs of these adders and Y It is provided with three adders 18a to 18c for adding signals.
係数回路１１は複数個の係数器で構成され、選
択スイツチS11の操作によつていずれか１個だけ
が選択される。他の係数回路１２乃至１６も複数
個の係数器で構成され、係数回路１１の場合と同
様の選択スイツチ（図示省略）によつていずれか
１個だけが選択される。 The coefficient circuit 11 is composed of a plurality of coefficient units, and only one of them is selected by operating the selection switch S11 . The other coefficient circuits 12 to 16 are also composed of a plurality of coefficient units, and only one of them is selected by a selection switch (not shown) similar to the case of the coefficient circuit 11.
この肌色補正マトリクス回路１０の各係数回路
の係数値の組合せは、一例として、
（Ｒ） ＝ （１ r1r2） （ Ｙ ）
（Ｇ） ＝ （１ g1g2） （Ｒ−Ｙ）
（Ｂ） ＝ （１ b1b2） （Ｂ−Ｙ）
という色信号間の変換が行われるように設定され
る。 The combination of coefficient values of each coefficient circuit of this skin color correction matrix circuit 10 is, for example, (R) = (1 r 1 r 2 ) (Y) (G) = (1 g 1 g 2 ) (R-Y) It is set so that the conversion between color signals is performed as follows: (B) = (1 b 1 b 2 ) (B-Y).
ここで、
r1＝b2k1sinθ1
r2＝b2k1cosθ1
g1＝b2k2sinθ2
g2＝b2k2cosθ2
ただし、k1はＲ−Ｙの復調比、θ1はＲ−Ｙの復
調角、k2はＧ−Ｙの復調比、θ2はＧ−Ｙの復調角
であり、これら復調比と復調角はＢ−Ｙ色差信号
を基準としている。また、b1は０、b2はNTSC方
式のＢ−Ｙ色差信号の伸張係数2.03である。 Here, r 1 = b 2 k 1 sin θ 1 r 2 = b 2 k 1 cos θ 1 g 1 = b 2 k 2 sin θ 2 g 2 = b 2 k 2 cos θ 2 However, k 1 is the demodulation ratio of R-Y , θ 1 is the demodulation angle of R-Y, k 2 is the demodulation ratio of G-Y, and θ 2 is the demodulation angle of G-Y, and these demodulation ratio and demodulation angle are based on the B-Y color difference signal. Further, b 1 is 0, and b 2 is an expansion coefficient of 2.03 for the BY color difference signal of the NTSC system.
第１図の色信号変換回路２０は、第３図のブロ
ツク図に示すように、４個の係数器２１乃至２４
と、加算器２５と減算器２６から構成され、
（Ｒ Ｙ）＝（Ｃ Ｓ）（Ｉ）
（Ｂ Ｙ）＝（−Ｓ Ｃ）（Ｑ）
という入出力信号の変換を行う。 As shown in the block diagram of FIG. 3, the color signal conversion circuit 20 of FIG. 1 includes four coefficient multipliers 21 to 24.
It is composed of an adder 25 and a subtracter 26, and performs input/output signal conversion as follows: (RY)=(CS)(I)(BY)=(-SC)(Q).
ただし、Ｃ＝cos33゜，Ｓ＝sin33゜である。 However, C=cos33° and S=sin33°.
発明の効果
以上詳細に説明したように、本発明の肌色補正
機能を有するデイジタル・マトリクス回路によれ
ば、マトリクス回路内で肌色補正を同時に行つて
しまう構成であるから、肌色補正のためだけの回
路が不要となり、デイジタル回路の低価格化、小
型化、高信頼化が実現される。Effects of the Invention As explained in detail above, according to the digital matrix circuit having the skin color correction function of the present invention, the structure is such that skin color correction is performed simultaneously within the matrix circuit. This eliminates the need for digital circuits, making digital circuits cheaper, more compact, and more reliable.
また、係数回路を択一可能な複数種類の係数器
で構成しているため、何種類かの蛍光体の特性や
基準白色、あるいは出荷先によつて異なる需要者
の好みなどにあわせて適宜な係数値の組合せを選
択できる。さらに、色信号を演算処理し、それに
応じて係数値を動的に変更するなど肌色補正の適
応制御も可能となる。 In addition, since the coefficient circuit is composed of multiple types of coefficient units that can be selected from, it can be adjusted as appropriate depending on the characteristics of several types of phosphor, the standard white color, or the preferences of consumers, which vary depending on the shipping destination. You can select combinations of coefficient values. Furthermore, it is also possible to perform adaptive control of skin color correction, such as processing color signals and dynamically changing coefficient values accordingly.
さらに、本発明の一実施例によれば、肌色補正
マトリクス回路の前段でＩ，Ｑ信号からＲ−Ｙと
Ｂ−Ｙ信号への変換を行う構成であるから、肌色
補正マトリクス回路内に上記２種類の入力信号に
対応して２種類の係数器群を設置する必要がなく
なり、最小限の回路規模のもとでＩ，Ｑ信号入力
にも対応できる。 Furthermore, according to an embodiment of the present invention, since the I and Q signals are converted into R-Y and B-Y signals in the preceding stage of the skin color correction matrix circuit, the above two signals are included in the skin color correction matrix circuit. There is no need to install two types of coefficient multiplier groups corresponding to different types of input signals, and I and Q signal inputs can also be supported with a minimum circuit scale.
第１図は本発明の一実施例に係わる肌色補正機
能を備えたデイジタル・マトリクス回路の構成を
示すブロツク図、第２図は第１図の肌色補正マト
リクス回路１０の構成を示すブロツク図、第３図
は第１図の色信号変換回路２０の構成を示すブロ
ツク図である。
１０……肌色補正マトリクス回路、２０……色
信号変換回路、１１〜１６……択一可能な複数の
係数器から成る係数回路、１７ａ〜１８ｃ……加
算回路、２１〜２４……係数器。
FIG. 1 is a block diagram showing the configuration of a digital matrix circuit with a skin color correction function according to an embodiment of the present invention, and FIG. 2 is a block diagram showing the configuration of the skin color correction matrix circuit 10 of FIG. FIG. 3 is a block diagram showing the configuration of the color signal conversion circuit 20 of FIG. 1. 10... Skin color correction matrix circuit, 20... Color signal conversion circuit, 11-16... Coefficient circuit consisting of a plurality of selectable coefficient units, 17a-18c... Addition circuit, 21-24... Coefficient unit.
Claims (1)
成る複数の係数回路と、これら係数回路の出力を
加算する複数の加算器を備え、デイジタル映像信
号のＹ，Ｒ−Ｙ及びＢ−Ｙ信号を肌色補正しつつ
Ｒ，Ｇ，Ｂ信号に変換することを特徴とする肌色
補正機能を備えたデイジタル・マトリクス回路。1 Equipped with a plurality of coefficient circuits each consisting of a plurality of selectable coefficient circuits, and a plurality of adders that add the outputs of these coefficient circuits, the Y, R-Y, and B-Y signals of digital video signals are A digital matrix circuit with a skin color correction function, which is characterized by converting into R, G, and B signals while correcting the skin color.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6453286A JPS62234490A (en) | 1986-03-22 | 1986-03-22 | Digital matrix circuit provided with flesh correcting function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6453286A JPS62234490A (en) | 1986-03-22 | 1986-03-22 | Digital matrix circuit provided with flesh correcting function |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62234490A JPS62234490A (en) | 1987-10-14 |
| JPH0325995B2 true JPH0325995B2 (en) | 1991-04-09 |
Family
ID=13260925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6453286A Granted JPS62234490A (en) | 1986-03-22 | 1986-03-22 | Digital matrix circuit provided with flesh correcting function |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62234490A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01109891A (en) * | 1987-10-22 | 1989-04-26 | Matsushita Electric Ind Co Ltd | Digital picture transmission system |
-
1986
- 1986-03-22 JP JP6453286A patent/JPS62234490A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62234490A (en) | 1987-10-14 |
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