JPS636198B2 - - Google Patents

Info

Publication number
JPS636198B2
JPS636198B2 JP4299280A JP4299280A JPS636198B2 JP S636198 B2 JPS636198 B2 JP S636198B2 JP 4299280 A JP4299280 A JP 4299280A JP 4299280 A JP4299280 A JP 4299280A JP S636198 B2 JPS636198 B2 JP S636198B2
Authority
JP
Japan
Prior art keywords
signal
color
color television
television signal
correlation
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
Application number
JP4299280A
Other languages
Japanese (ja)
Other versions
JPS56140786A (en
Inventor
Toshiro Watanabe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP4299280A priority Critical patent/JPS56140786A/en
Priority to US06/249,699 priority patent/US4394680A/en
Publication of JPS56140786A publication Critical patent/JPS56140786A/en
Publication of JPS636198B2 publication Critical patent/JPS636198B2/ja
Granted legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/64Circuits for processing colour signals
    • H04N9/74Circuits for processing colour signals for obtaining special effects
    • H04N9/75Chroma key

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Processing Of Color Television Signals (AREA)

Description

【発明の詳細な説明】 本発明はカラーテレビジヨン信号の処理方式に
関するものである。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a color television signal processing method.

従来、カラーテレビジヨン画像中の特定の色の
部分を抜き出し、そこに違つた色をはめ込むとい
う色変換処理をクロマキー技法を用いて行なつて
いる。クロマキーは色の3要素である輝度、彩
度、色相のうち、色相差を主に利用しているもの
で、使用されるキーイング信号や混合増幅器の動
作がスイツチング方式かリニア方式かによりハー
ドクロマキーとソフトクロマキーに分類されてい
る。後者のソフトクロマキーは自然な画面合成の
できる利点はあるが、R・G・B原色信号を必要
としていた。しかしNTSCカラーテレビジヨン信
号やPALカラーテレビジヨン信号等の複合カラ
ーテレビジヨン信号のまま色変換処理を行なうラ
インクロマキーはVTR収録後でも随時必要に応
じて行なえるという利点があり、R・G・B原色
信号を必要としないソフトクロマキー技法が望ま
れる。以上は全てカラーテレビジヨン信号のアナ
ログ処理であるが、近年カラーテレビジヨン信号
のデイジタル処理が普及し、デイジタルVTRの
出現も予測されるに至り、符号化された複合カラ
ーテレビジヨン信号のまま前述の色変換処理を行
なえる必要がでてきた。
Conventionally, a color conversion process has been performed using a chromakey technique, in which a specific color part in a color television image is extracted and a different color is inserted therein. Chromakey mainly uses the hue difference among the three elements of color: brightness, saturation, and hue, and is classified as hard chromakey depending on the keying signal used and whether the mixing amplifier operates in a switching or linear manner. It is classified as soft chroma key. The latter type of soft chroma key has the advantage of allowing natural screen composition, but requires R, G, and B primary color signals. However, line chroma keying, which performs color conversion processing on composite color television signals such as NTSC color television signals and PAL color television signals, has the advantage of being able to perform color conversion processing as needed even after VTR recording. Soft chromakey techniques that do not require primary color signals are desired. All of the above is analog processing of color television signals, but in recent years, digital processing of color television signals has become widespread, and the appearance of digital VTRs has been predicted. It became necessary to be able to perform color conversion processing.

本発明は複合カラーテレビジヨン信号から特定
の色の部分を検出し、その部分にもう1つのカラ
ーテレビジヨン信号を合成するための階調を有す
るキーイング信号を発生させる信号処理方式を提
供しようとするものである。
The present invention attempts to provide a signal processing method that detects a specific color portion from a composite color television signal and generates a keying signal having gradations for synthesizing another color television signal with that portion. It is something.

本発明によればカラーテレビジヨン信号を色副
搬送波周期の整数分の1の画素単位に分割し記憶
するレジスタ群より2種のカラーテレビジヨン画
像の同位置に隣接する複数の画素信号を読取り、
前記2種のカラーテレビジヨン画像間の相関を演
算する手段を備え、これより求まる相関信号の色
度差と輝度差に係わる信号のうちいずれか或いは
両者を基にレベル変化するキーイング信号を生成
しており、このキーイング信号により前記カラー
テレビジヨン画像のうち少なくとも一方のカラー
テレビジヨン画像のレベル制御を行なうことによ
り前述のソフトクロマキー機能をも含む新規な色
信号処理が実現する。その際他方のカラーテレビ
ジヨン画像は比較用となり所望する信号処理によ
り選択されればよい。
According to the present invention, a plurality of pixel signals adjacent to the same position of two types of color television images are read from a register group that divides and stores a color television signal into pixel units of an integer fraction of the color subcarrier period,
The apparatus comprises means for calculating the correlation between the two types of color television images, and generates a keying signal whose level changes based on one or both of the signals related to the chromaticity difference and the luminance difference of the correlation signal determined from the correlation signal. By using this keying signal to control the level of at least one of the color television images, novel color signal processing including the soft chroma key function described above is realized. At this time, the other color television image may be used for comparison and selected by desired signal processing.

次に本発明の原理を詳細に説明する。第1図は
同位相関係にあるカラーテレビジヨン信号A
(VA)とカラーテレビジヨン信号B(VB)との
相関演算を説明するため搬送色度信号の重畳され
た前記2種の複合カラーテレビジヨン信号波形の
一部を拡大した図であり、レベルa0,a1,a2……
およびレベルb0,b1,b2……は色副搬送波周期
Tscを4等分割する標本化パルスにより標本化さ
れた画素列のレベルを示している。局所的に見れ
ばカラーテレビジヨン信号A(VA)とカラーテ
レビジヨン信号B(VB)は次式に表わされる。
Next, the principle of the present invention will be explained in detail. Figure 1 shows a color television signal A having the same phase relationship.
In order to explain the correlation calculation between the color television signal B (VB) and the color television signal B (VB), it is an enlarged view of a part of the two types of composite color television signal waveforms on which the carrier chromaticity signal is superimposed. 0 , a1 , a2 ...
and levels b 0 , b 1 , b 2 ... are color subcarrier periods
It shows the level of a pixel column sampled by a sampling pulse that divides Tsc into four equal parts. Viewed locally, color television signal A (VA) and color television signal B (VB) are expressed by the following equations.

VA=YA+CA・sin(θA+ωt) (1) VB=YB+CB・sin(θB+ωt) (2) ここでそれぞれYA・YBは輝度成分、CA・CB
彩度成分、θA・θBは色相角を示している。前記
(1)、(2)式より各サンプリングレベルa0,a1,a2
b0,b1,b2は次式となる。
VA=Y A +C A・sin (θ A +ωt) (1) VB=Y B +C B・sin (θ B +ωt) (2) Here, Y A and Y B are luminance components, and C A and C B are The saturation components θ A and θ B indicate hue angles. Said
From equations (1) and (2), each sampling level a 0 , a 1 , a 2 ,
b 0 , b 1 , and b 2 are as follows.

前記(3)、(4)式の方程式を解くことによりカラー
テレビジヨン信号A(VA)の各成分が次のよう
に求まる。
By solving equations (3) and (4) above, each component of the color television signal A (VA) is determined as follows.

同様にしてカラーテレビジヨン信号B(VB)
の各成分も求まる。
Similarly, color television signal B (VB)
Each component of is also found.

カラーテレビジヨン信号Aとカラーテレビジヨ
ン信号Bとの相関を各成分毎に求めるとすれば、
先ず輝度差△Yに関しては、 △Y=YA−YB=1/2(a0−b0+a2−b2) (7) となる。次に彩度差△Cに関しては、 となり、色相差△θに関しては次式を得る。
If the correlation between color television signal A and color television signal B is determined for each component,
First, regarding the brightness difference ΔY, ΔY=Y A −Y B =1/2 (a 0 −b 0 +a 2 −b 2 ) (7). Next, regarding the saturation difference △C, As for the hue difference Δθ, the following equation is obtained.

△θ=θA−θB =sin-1(a0−a2/2CA)−sin-1(b0−b2/2CB) (9) これらの差値をカラーテレビジヨン信号Aについ
て正規化し、前記2信号の相関関数Φを表わすの
に用いれば次式となる。
△θ=θ A −θ B = sin -1 (a 0a 2 /2C A )−sin -1 (b 0 −b 2 /2C B ) (9) These difference values are calculated for color television signal A. When normalized and used to express the correlation function Φ of the two signals, the following equation is obtained.

Φ=(1−△Y/YA)・(1−△C/CA)・(1−△C
/2π)(10) ここで色の3要素中例えば色相に関する項のみ
取出しカラーテレビジヨン信号Aとカラーテレビ
ジヨン信号Bとの色相差のみ問題とし(11)式に
示される相関信号Φ〓(0≦Φ〓≦1)により Φθ=(1−△θ/2π) (11) 前記2信号のうち一方の信号レベルを制御すれ
ば、従来のクロマキー手法に相当する信号処理が
可能となるものである。クロマキー手法で用いら
れるアナログ技術では(11)式で必要となる色相
差△θを求めるための(5)、(6)、(9)式を演算するこ
とは不可能に近く他の要素例えば彩度変化により
キーイング信号ルベルが変化するもので、厳密に
は色相検出のみからキーイング信号を生成してい
るものではない。しかし画面のはめ込みを主の目
的とするこのような映像処理においては、最終的
には視覚相関を問題とするものであるから、かえ
つて(11)式の如く3要素を分離して扱かうのは
適当でない。そこで相関の非常に近い領域や、色
の3要素(輝度・彩度・色相)の特性をも考慮し
た視覚相関の場合等では(12)式に示す如く、
夫々の差値に夫々の重み係数K1、K2、K3を乗じ
た加算式あるいはこれに近い非加算式(例えば3
項のうち最大値・最小値を有効とする等)のより
実際的な相関関φKで近似しても大過はない。
Φ=(1-△Y/Y A )・(1-△C/C A )・(1-△C
/2π) (10) Here, among the three color elements, for example, only the term related to hue is taken out, and only the hue difference between color television signal A and color television signal B is concerned, and the correlation signal Φ〓(0 ≦Φ〓≦1), Φθ=(1−△θ/2π) (11) By controlling the signal level of one of the two signals, signal processing equivalent to the conventional chromakey method is possible. . With the analog technology used in the chromakey method, it is almost impossible to calculate equations (5), (6), and (9) to obtain the hue difference △θ required by equation (11). The keying signal level changes depending on the degree of change, and strictly speaking, the keying signal is not generated only from hue detection. However, in this kind of video processing whose main purpose is to fit the screen, the final issue is visual correlation, so it is better to treat the three elements separately as shown in equation (11). is not appropriate. Therefore, in the case of visual correlation that also takes into account regions with very close correlations and the characteristics of the three color elements (luminance, saturation, and hue), as shown in equation (12),
An additive formula in which each difference value is multiplied by the respective weighting coefficients K 1 , K 2 , K 3 or a non-additive formula similar to this (for example, 3
It would not be too much of a mistake to approximate it with a more practical correlation φ K (for example, by validating the maximum and minimum values of the terms).

ΦK=(1−K1・△Y/YA)+(1−K2・△C/CA) +(1−K3・△θ/2π) (12) 本発明はこのようなΦKで示される相関信号を
キーイング信号とし、前記2種のカラーテレビジ
ヨン信号の相関に応じて一方のカラーテレビジヨ
ン信号のレベル制御させるという信号処理を行な
おうとするもので、例えば他方のカラーテレビジ
ヨン信号を画像はめ込み用比較色信号とし、且つ
色度差の重み係数K2・K3を大とし、従来のクロ
マキーに近い信号処理とすることも可能で、また
重み係数を選択することにより輝度差を主とする
ルミナンスキー処理にも拡張して利用できること
は明らかである。以上によりキーイング信号を算
出する方法が確立した。次に実際にキーイング信
号を求めるには(12)式を(5)〜(9)式に基づいて
a0,a2,b0,b1,b2の画素レベルより演算し、こ
れを時間t1でのキーイング信号レベルとする演算
オペレータを具備し、サンプル毎に前記オペレー
タを移動させるか画素列を移動させるかして実施
できる。PCM化されたデイジタルカラーテレビ
ジヨン信号は前記の演算処理を行なうには都合が
よく高速乗算器や加算器、さらに複雑な演算には
テーブル用のROMを用いれば容易にこれを構成
できる。第2図は本発明をカラーテレビジヨン信
号Bのはめ込み(抜き取り)に使用した実施例の
ブロツク図である。
Φ K = (1-K 1 △Y/Y A ) + (1-K 2 △C/C A ) + (1-K 3 △θ/2π) (12) The present invention The correlation signal indicated by K is used as a keying signal, and signal processing is performed in which the level of one color television signal is controlled according to the correlation between the two types of color television signals. It is also possible to use the color signal as a comparison color signal for image embedding, and to increase the weighting coefficients K 2 and K 3 of the chromaticity difference, resulting in signal processing similar to conventional chroma key.Also, by selecting the weighting coefficient, it is possible to It is clear that the method can be extended to luminance key processing that mainly uses differences. Through the above, a method for calculating keying signals has been established. Next, to actually obtain the keying signal, replace equation (12) with equations (5) to (9).
It is equipped with a calculation operator that calculates from the pixel levels of a 0 , a 2 , b 0 , b 1 , and b 2 and uses this as the keying signal level at time t 1 , and moves the operator for each sample or changes the pixel column. This can be done by moving the PCM-converted digital color television signals are convenient for performing the above-mentioned arithmetic processing, and can be easily constructed by using high-speed multipliers and adders, and for more complex arithmetic operations, a table ROM. FIG. 2 is a block diagram of an embodiment in which the present invention is used for inserting (extracting) a color television signal B.

第2図において、デイジタルカラーテレビジヨ
ン信号A(VIDEO―A)は色副搬送波の4倍の周
波数(4×sc)を有するサンプルクロツクにて
自然2進8ビツトに符号化されたものである。1
〜4は8ビツトのレジスタで、前記サンプルクロ
ツクにより駆動され、シフトレジスタを形成して
おり、各レジスタ出力端子からは一時記憶された
画素レベル信号a0,a1,a2が出力されている。カ
ラーテレビジヨン信号B(VIDEO―B)に関して
も同様に、レジスタ5〜9が設けられ各レジスタ
から出力信号b0,b1,b2が得られる。10は相関
演算オペレータで、前記画素レベル信号a0,a1
a2,b0,b1,b2より前述の(5)〜(9)式より△Y、
YA、△C、CA、△θを算出するもので高速加算
器や関数テーブルROM等をパイプライン構成さ
せたものである。ここで関数テーブルROMは加
算器や乗算器で実施するには複雑すぎる演算を負
うもので√22やsin-1θ等の関数演算を行な
う。この相関演算オペレータ10の出力に夫々重
み係数を乗じ色の3要素別の相関信号を作るのが
相関号生成器11〜13であり、夫々(12)式の
第1項〜第3項の演算を分担する。14はキーイ
ング信号生成器であり加算器をもち、前記相関信
号生成器11〜13にて重みを付加された3信号
を加算して(12)式のΦKに相当するキーイング
信号KEYを発生させる。(12)式は相関の大なる
場合の設定であり、これ以外ではさらに簡略化し
た他の演算式を適応させた方がより、実際的で、
また(12)式による演算結果の1部領域を増幅さ
せる等のキーイング信号生成回路をも14に含む
とする。レジスタ9はキーイング信号KEYを発
生させるまで経た相関回路10〜14に含まれる
パイプラインレジススタによる遅延量を補正する
ためのもので数段のレジスタ群からなる。これに
より位相を合わせられたデイジタルカラーテレビ
ジヨン信号VIDEO―B′が得られる。以上が第2
図のブロツク線図中の破線内の説明である。さら
にこれより得られた信号VIDEO―B′とKEYを基
にレベル制御を行なわせるものが15のデイジタ
ルテレビジヨン信号レベル制御回路である。これ
は高速乗算器よりなり、前記2信号を乗算するこ
とによりレベル制御させた信号VIDEO―B″を出
力する。このようにしてカラーテレビジヨン信号
Aはもう一方のカラーテレビジヨン信号Bとの相
関の大小によりレベル制御されることになる。
In Figure 2, digital color television signal A (VIDEO-A) is encoded into 8 natural binary bits using a sample clock having a frequency (4 x sc ) that is four times the frequency of the color subcarrier. . 1
-4 are 8-bit registers that are driven by the sample clock and form a shift register, and temporarily stored pixel level signals a 0 , a 1 , and a 2 are output from each register output terminal. There is. Similarly, registers 5 to 9 are provided for color television signal B (VIDEO-B), and output signals b 0 , b 1 , and b 2 are obtained from each register. 10 is a correlation calculation operator, which calculates the pixel level signals a 0 , a 1 ,
From a 2 , b 0 , b 1 , and b 2, △Y from equations (5) to (9) above,
It calculates Y A , △C, C A , and △θ, and has a high-speed adder, function table ROM, etc. configured in a pipeline. Here, the function table ROM is responsible for operations that are too complex to be performed by adders or multipliers, and performs function operations such as √ 2 + 2 and sin -1 θ. Correlation signal generators 11 to 13 create correlation signals for each of the three color elements by multiplying the output of the correlation calculation operator 10 by a weighting coefficient, respectively, and calculate the first to third terms of equation (12), respectively. share. 14 is a keying signal generator, which has an adder, and adds the three weighted signals from the correlation signal generators 11 to 13 to generate a keying signal KEY corresponding to Φ K in equation (12). . Equation (12) is a setting for cases where the correlation is large, and in other cases, it is more practical to apply other simplified calculation equations.
It is also assumed that the keying signal generation circuit 14 includes a keying signal generation circuit for amplifying a partial region of the calculation result based on equation (12). The register 9 is for correcting the amount of delay caused by the pipeline registers included in the correlation circuits 10 to 14 that have gone through until the keying signal KEY is generated, and is made up of a group of registers in several stages. This results in a phased digital color television signal VIDEO-B'. The above is the second
This is the explanation within the broken line in the block diagram of the figure. Furthermore, a digital television signal level control circuit 15 performs level control based on the signals VIDEO-B' and KEY obtained from this. This consists of a high-speed multiplier, and outputs a level-controlled signal VIDEO-B'' by multiplying the two signals. In this way, the color television signal A is correlated with the other color television signal B. The level will be controlled depending on the size of.

こうした信号処理の応用として色度差特に色相
差を主とする相関を用いたクロマキーについても
う少し詳細な説明を追加するならば、先ずカラー
テレビジヨン信号B中の抜き取りたい色の色信号
をカラーテレビジヨン信号Aとする。それにはバ
ツクカラーのようなテレビジヨン信号を入力とし
てもよく、またレジスタ1〜4に何らかの方法で
希望の色信号レベルを記憶させ、その後レジスタ
4の出力をレジスタ1の入力へ接続しサンプルク
ロツク毎に循環させてもよい。こうして特定の色
信号とカラーテレビジヨン信号Bとの相関を演算
し、特に色度差に関する差信号の重みを大とし、
キーイング信号を生成させ、このキーイング信号
のレベルに応じてテレビジヨン信号B中の前記色
の領域を減衰させるようにレベル制御し、そこに
同じキーイング信号により前記デイジタルテレビ
ジヨン信号レベル制御回路15と同等の回路16
により逆極性にレベル制御される第3のテレビジ
ヨン信号VIDEO―Cをはめ込めばよい。こうし
た合成画面の境界のレベル制御された2信号がオ
ーバーラツプ(デイゾルブ)する領域では抜き取
るべき色が透けて見えるようなフレアが出て不自
然な輪郭を生じる。これを解決するには先行技術
である。
If we were to add a more detailed explanation of chroma keying, which uses correlation mainly based on chromaticity difference, especially hue difference, as an application of signal processing, we would first start by converting the color signal of the color to be extracted from color television signal B into color television signal B. Let's call it signal A. For this purpose, a television signal such as a back color signal may be input, and the desired color signal level is stored in registers 1 to 4 by some method, and then the output of register 4 is connected to the input of register 1, and the signal is output every sample clock. It may be circulated. In this way, the correlation between a specific color signal and the color television signal B is calculated, and in particular, the weight of the difference signal regarding the chromaticity difference is increased,
A keying signal is generated, the level is controlled so as to attenuate the color area in the television signal B according to the level of the keying signal, and the same keying signal is used to control the level of the color area in accordance with the level of the keying signal. circuit 16
It is sufficient to insert a third television signal VIDEO-C whose level is controlled to have the opposite polarity. In the area where the two level-controlled signals overlap (dissolve) at the boundary of the composite screen, a flare occurs in which the color to be extracted is seen through, resulting in an unnatural outline. The solution to this problem is prior art.

アナログ方式のソフトクロマキーで提案された
色消去回路の原理を基にデイジタル化した回路を
追加すればよく、より詳しい説明は割愛する。こ
うしたデイジタル式のクロマキーはアナログ方式
では不可能な演算アルゴリズムをも忠実に且つ正
確に行ない、特に色の検出にその特徴を発揮し中
間色を基調とするクロマキーをも可能とする。
It is sufficient to add a digital circuit based on the principle of the color erasing circuit proposed for analog soft chroma keying, and a more detailed explanation will be omitted. Such digital chroma keys faithfully and accurately perform calculation algorithms that are impossible with analog methods, and are especially effective in color detection, making it possible to perform chroma keys based on intermediate colors.

なお、(12)式に示される相関関数式を導くの
にあたり、輝度成分YA、YBを固定値として扱か
つたが、実際には高い周波数特性を有するもの
で、既に提案されている種々の方法、例えばデイ
ジタルくし形フイルタ等により分離した方が望ま
しく、それを換算したクロマ成分について前述の
ような相関演算を実施すればよい。またこれまで
は説明のため水平方向について前後1画素、計3
画素から各成分を算出したが、これにとらわれる
ものではなく要求される特性により水平・垂直方
向の画素数を適切に選択し最適相関演算式を用い
ればよい。
Note that in deriving the correlation function equation shown in equation (12), the luminance components Y A and Y B were treated as fixed values, but in reality they have high frequency characteristics, and various methods have been proposed. It is preferable to separate the chroma components using the method described above, for example, using a digital comb filter, and the above-mentioned correlation calculation may be performed on the converted chroma components. Also, for the sake of explanation, up until now, 1 pixel in the front and back in the horizontal direction, a total of 3 pixels.
Although each component is calculated from the pixels, the number of pixels in the horizontal and vertical directions may be appropriately selected depending on the required characteristics, and the optimum correlation calculation formula may be used.

また、以上は色ベクトル上で2点の色位相関係
を色相と彩度、いわゆる極座標系で示したが、こ
れを例えばI・Q軸の直交座標系に置換しても同
様のことが言えることは明らかである。特に前述
の例の如くサンプル周波数が4×scに選ばれれ
ば、各サンプル点を±I軸とQ軸とに一致させ
Y・I・Q分離が簡単な復調回路で行なえる。従
来のクロマキーで用いられる主に色相差という色
検出基準にとらわれない場合等はIQ成分差より
色ベクトル上でのI・Q帯域幅比をも考慮した2
点間距離もしくはこれを近似する値を求める色度
相関式を採用すればよい。
In addition, although the color phase relationship between two points on a color vector has been shown above using hue and saturation, a so-called polar coordinate system, the same thing can be said even if this is replaced with, for example, an orthogonal coordinate system of I and Q axes. is clear. In particular, if the sampling frequency is selected to be 4.times.sc as in the above example, each sample point can be aligned with the .+-.I axis and the Q axis, and Y, I, and Q separation can be performed by a simple demodulation circuit. In cases where the color detection criteria used in conventional chromakey is not limited to the hue difference, etc., the I/Q bandwidth ratio on the color vector is considered rather than the IQ component difference2.
A chromaticity correlation formula that calculates the distance between points or a value that approximates this may be used.

以上のように本発明は相関演算オペレータから
見れば対等な2組の画素列記憶手段をもち、夫々
に2種のカラーテレビジヨン信号を記憶し、前記
オペレータをはじめ様々な演算を施す相関回路か
らの出力をキーイング信号として前記2種のうち
少なくとも一方のレベル制御を行なう信号処理方
式であり、複合デイジタルカラーテレビジヨン信
号をデイジタル処理する多くの分野に適用するこ
とができる。さらにレベル制御されるテレビジヨ
ン信号は相関演算される一方の複合デイジタルカ
ラーテレビジヨン信号と同等のものと限定するも
のでなく、前記複合デイジタルカラーテレビジヨ
ン信号中の例えば色度成分のみとしてもよい。こ
のようにすれば入力画像中の特定の色領域を他の
色に変化させるという色変換処理も可能となる。
また本発明は特にNTSC方式にとらわれるもので
もない。
As described above, the present invention has two sets of pixel array storage means that are equal from the perspective of a correlation calculation operator, each of which stores two types of color television signals, and a correlation circuit that performs various calculations including the operator. This is a signal processing method in which the level of at least one of the two types is controlled using the output as a keying signal, and can be applied to many fields in which composite digital color television signals are digitally processed. Furthermore, the level-controlled television signal is not limited to one equivalent to one of the composite digital color television signals subjected to the correlation calculation, and may be, for example, only the chromaticity component of the composite digital color television signal. In this way, color conversion processing that changes a specific color area in the input image to another color becomes possible.
Further, the present invention is not particularly limited to the NTSC system.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の原理を説明するための2種の
カラーテレビジヨン信号波形図、第2図は本発明
の一実施例におけるカラーテレビジヨン信号処理
方式を示すブロツク線図である。 1〜9…レジスタ、10…相関演算オペレー
タ、11〜13…相関演算生成器、14…キーイ
ング信号生成器、15,16…デイジタルテレビ
ジヨン信号レベル制御回路。
FIG. 1 is a waveform diagram of two types of color television signals for explaining the principle of the present invention, and FIG. 2 is a block diagram showing a color television signal processing system in one embodiment of the present invention. 1-9...Register, 10...Correlation calculation operator, 11-13...Correlation calculation generator, 14...Keying signal generator, 15, 16...Digital television signal level control circuit.

Claims (1)

【特許請求の範囲】[Claims] 1 カラーテレビジヨン信号を色副搬送波周期の
整数分の1の画素単位に分割し記憶する手段を第
1のカラーテレビジヨン信号と第2のカラーテレ
ビジヨン信号について備え、前記記憶手段からの
複数個の画素より前記第1のカラーテレビジヨン
信号と第2のカラーテレビジヨン信号間の相関を
演算し相関信号を発生する手段と、前記相関信号
から色度差と輝度差に係わる信号のうち少くとも
一方を抽出し前記第1のカラーテレビジヨン信号
および第2のカラーテレビジヨン信号の少なくと
も一方のレベルを制御するキーイング信号を生成
する手段とを有し、複数のカラーテレビジヨン信
号の合成制御を行なうことを特徴とするカラーテ
レビジヨン信号処理方式。
1. Means for dividing and storing a color television signal into pixel units of an integer fraction of a color subcarrier period is provided for the first color television signal and the second color television signal, and a plurality of pixels from the storage means are provided. means for calculating the correlation between the first color television signal and the second color television signal from the pixels of , and generating a correlation signal; and at least a signal related to a chromaticity difference and a luminance difference from the correlation signal. means for extracting one of the first color television signals and generating a keying signal for controlling the level of at least one of the first color television signal and the second color television signal, and controlling the synthesis of a plurality of color television signals. A color television signal processing system characterized by:
JP4299280A 1980-04-01 1980-04-01 Processing system of color television signal Granted JPS56140786A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP4299280A JPS56140786A (en) 1980-04-01 1980-04-01 Processing system of color television signal
US06/249,699 US4394680A (en) 1980-04-01 1981-03-31 Color television signal processing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4299280A JPS56140786A (en) 1980-04-01 1980-04-01 Processing system of color television signal

Publications (2)

Publication Number Publication Date
JPS56140786A JPS56140786A (en) 1981-11-04
JPS636198B2 true JPS636198B2 (en) 1988-02-08

Family

ID=12651517

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4299280A Granted JPS56140786A (en) 1980-04-01 1980-04-01 Processing system of color television signal

Country Status (1)

Country Link
JP (1) JPS56140786A (en)

Also Published As

Publication number Publication date
JPS56140786A (en) 1981-11-04

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