JPH06261332A - Primary color conversion method for multiple primary colors display - Google Patents
Primary color conversion method for multiple primary colors displayInfo
- Publication number
- JPH06261332A JPH06261332A JP4281793A JP4281793A JPH06261332A JP H06261332 A JPH06261332 A JP H06261332A JP 4281793 A JP4281793 A JP 4281793A JP 4281793 A JP4281793 A JP 4281793A JP H06261332 A JPH06261332 A JP H06261332A
- Authority
- JP
- Japan
- Prior art keywords
- primary
- color
- colors
- primary colors
- primary color
- 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.)
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Links
Landscapes
- Processing Of Color Television Signals (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、テレビジョン信号を
表示するための信号処理回路に係り、特に簡易な１次結
合と負信号のクリップとを用いて３原色方式になるカラ
ーテレビジョン信号を多原色表示用の信号へ変換する原
色変換方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal processing circuit for displaying a television signal, and particularly to a color television signal of a three-primary color system using a simple primary coupling and a clip of a negative signal. The present invention relates to a primary color conversion method for converting a signal for multi-primary color display.
【０００２】[0002]
【従来の技術】現行のカラーテレビジョン伝送方式ある
いはその表示装置においては、３原色からの伝送あるい
は３原色にもとづいた表示が実用化されており、３原色
を越える多原色表示の従来技術は存在しなかった。2. Description of the Related Art In the current color television transmission system or its display device, transmission from three primary colors or display based on three primary colors has been put into practical use, and there is a conventional technique of multi-primary color display exceeding three primary colors. I didn't.
【０００３】[0003]
【発明が解決しようとする課題】例えば現行のカラーテ
レビジョン標準方式は３つの原色点、即ち赤（Ｒ）、緑
（Ｇ）および青（Ｂ）から成り立っている。ｘｙ色度図
上にこれらの原色点を表示すると例えば図７のようにな
る。現行の標準方式は図７の３角形ＲＧＢの外側にある
色も表現することが可能であり、任意の色を３原色点
Ｒ，ＧおよびＢの信号レベルｒ，ｇおよびｂにより表現
すれば、点Ａはｒの値が負になる色である。For example, the current color television standard system consists of three primary color points: red (R), green (G) and blue (B). When these primary color points are displayed on the xy chromaticity diagram, for example, it becomes as shown in FIG. The current standard method can also represent colors outside the triangle RGB of FIG. 7, and if an arbitrary color is represented by the signal levels r, g and b of the three primary color points R, G and B, Point A is a color for which the value of r is negative.
【０００４】しかし受像機側においてはレベルが負の値
に相当する発光色は存在しないため、３原色点が受信側
と送信側とで等しければ、色度図上の点Ａのような３角
形の外側に位置する色は正しく再現できないことにな
る。これを改善する方法として次の２つの方法が考えら
れる。 （ｉ）受像機側で彩度の高い色を３原色点とする。 （ii) 彩度の高い色を加えて、より多原色の受像機とす
る。 （ｉ）の方法で広い色範囲を再現しようとすると、非常
に彩度の高い色を用いる必要があり、通常彩度の高い色
は輝度が低いことから（ii) の方法の方が実用上有利で
ある。However, since there is no emission color corresponding to a negative level on the receiver side, if the three primary color points are the same on the receiving side and the transmitting side, then a triangle like point A on the chromaticity diagram. Colors located outside of will not be reproduced correctly. The following two methods are considered as methods for improving this. (I) Highly saturated colors on the receiver side are defined as the three primary color points. (Ii) Add multi-saturated colors to make a multi-primary color receiver. In order to reproduce a wide color range with the method (i), it is necessary to use a highly saturated color, and a color with a high saturation usually has a low luminance, so the method (ii) is practically used. It is advantageous.
【０００５】今一例として図８のような６原色表示を考
える。新しい原色はＯ，Ｐ，Ｑ，Ｓ，Ｔ，Ｕである。６
原色を考えたのは、現行の表示が３原色なので、これの
整数倍とすることが実用上容易と考えられるからであ
る。６原色各色の信号レベルがそれぞれｏ，ｐ，ｑ，
ｓ，ｔ，ｕである色を、３原色システムで表現したとき
に３原色各色の信号レベルがそれぞれｒ，ｇ，ｂである
ならば、Ｒ，Ｇ，Ｂ，Ｏ，Ｐ，Ｑ，Ｓ，Ｔ，Ｕを１×３
のマトリクスとして（要素は光の３刺激値）、式（１）
が成立する。As an example, consider the display of six primary colors as shown in FIG. The new primary colors are O, P, Q, S, T, U. 6
The primary colors are considered because the current display is three primary colors, and it is considered practically easy to make an integral multiple of these. The signal levels of the six primary colors are o, p, q,
If the signal levels of the three primary colors are r, g, and b when the colors of s, t, and u are expressed by the three primary color system, R, G, B, O, P, Q, S, 1 x 3 for T and U
As a matrix (the elements are the tristimulus values of light), equation (1)
Is established.
【数１】 ｏ・Ｏ＋ｐ・Ｐ＋ｑ・Ｑ＋ｓ・Ｓ＋ｔ・Ｔ＋ｕ・Ｕ ＝ｒ・Ｒ＋ｇ・Ｇ＋ｂ・Ｂ （１） 式（１）は６元３連立方程式であるから何か条件を付加
しなければ解くことはできない。## EQU1 ## o.O + p.P + q.Q + s.S + t.T + u.U = r.R + g.G + b.B (1) Equation (1) is a 6-element, 3-system simultaneous equation, so solve it without adding any conditions. It is not possible.
【０００６】そこで本発明の目的は、伝送されてきた３
原色方式になるカラーテレビジョン信号を多原色表示用
の信号に変換して、彩度の高い色も正確に再現すること
の可能な、より具体的には前述の式（１）のような６元
３連立方程式を解くことの可能な多原色表示用原色変換
方法を提供せんとするものである。Therefore, the object of the present invention has been to transmit 3
It is possible to convert a color television signal in the primary color system into a signal for multi-primary color display and accurately reproduce a color with high saturation. More specifically, as shown in the formula (1) above, It is intended to provide a primary color conversion method for multi-primary color display capable of solving the three simultaneous equations.
【０００７】[0007]
【課題を解決するための手段】その目的を達成するた
め、本発明多原色表示用原色変換方法になる第１の発明
は、伝送されてきたカラーテレビジョン信号の輝度信号
Ｙと２つの色差信号Ｃ1およびＣ2 を、逆マトリクス回
路を介して３原色信号Ｒ，Ｇ及びＢに変換し、変換によ
り得られた３原色信号Ｒ，ＧおよびＢが色度図上いかな
る位置にあるかを判定し、その判定結果に基づき別に色
度図上で設けた３原色を越える多原色の中から３つの原
色を選択し、これらの１次結合により入力色信号を表わ
し、受信側での多原色表示に備えるようにしたことを特
徴とするものである。In order to achieve the object, a first aspect of the present invention, which is a primary color conversion method for multi-primary color display, is a luminance signal Y of a transmitted color television signal and two color difference signals. C 1 and C 2 are converted into three primary color signals R, G and B via an inverse matrix circuit, and it is determined what position the three primary color signals R, G and B obtained by the conversion are on the chromaticity diagram. Then, based on the judgment result, three primary colors are selected from the multiple primary colors separately provided on the chromaticity diagram, and the primary color combination of these is used to represent the input color signal, and the multi-primary color is displayed on the receiving side. It is characterized by being prepared for.
【０００８】またその第２の発明は、伝送されてきたカ
ラーテレビジョン信号の輝度信号Ｙと２つの色差信号Ｃ
1 およびＣ2 を、逆マトリクス回路を介して３原色信号
Ｒ，ＧおよびＢに変換し、受信側で別に色度図上で設け
た３原色を越える多原色信号をそれぞれ前記３原色信号
Ｒ，ＧおよびＢの１次結合として計算して出力し、前記
３原色を越える多原色の中から３つの原色を選択し、そ
れ以外の原色の前記１次結合の出力が負になる時にはそ
の出力を零にするとともに補正信号を用意し、前記選択
された３つの原色の前記１次結合の出力にその補正信号
を加算して出力し、受信側での多原色を表示に備えるよ
うにしたことを特徴とするものである。A second aspect of the present invention is the luminance signal Y of the transmitted color television signal and the two color difference signals C.
1 and C 2 are converted into three primary color signals R, G and B through an inverse matrix circuit, and multi-primary color signals R, G and B which are separately provided on the chromaticity diagram and which exceed three primary colors on the chromaticity diagram are respectively converted into the three primary color signals R, G It is calculated and output as a primary combination of G and B, three primary colors are selected from the above-mentioned three primary colors, and when the output of the primary combination of the other primary colors becomes negative, the output is output. In addition to setting the value to zero, a correction signal is prepared, the correction signal is added to the output of the primary combination of the selected three primary colors, and the result is output, so that multiple primary colors on the receiving side are prepared for display. It is a feature.
【０００９】[0009]
【実施例】以下添付図面を参照し実施例により本発明を
詳細に説明する。まず伝送されたきた３原色方式になる
カラーテレビジョン信号の輝度信号Ｙおよび２つの色差
信号Ｃ1,Ｃ2 は通常の逆マトリクス回路により３原色信
号Ｒ，Ｇ及びＢに変換される。この３原色信号をその入
力の色に応じて、画素毎に、受信側にて３原色以上の原
色点間で原色点を切り替える方法が本願の第１の発明で
ある。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. First, the transmitted luminance signal Y of the color television signal of the three primary color system and the two color difference signals C 1 and C 2 are converted into the three primary color signals R, G and B by an ordinary inverse matrix circuit. The first invention of the present application is a method of switching the primary color points among the primary color points of three or more primary colors on the receiving side for each pixel in accordance with the input colors of the three primary color signals.
【００１０】図２に６原色表示で、うち３原色の組合せ
で表示の可能な４つの領域（３角形ＯＰＱ，ＰＳＱ，Ｔ
ＯＱ，ＴＱＵ）に色範囲を分けた第１の実施例である。
例えば入力色信号が色度図上３角形ＯＰＱの範囲にある
ならば、式（１）に於いてｓ＝ｔ＝ｕ＝0.0 とした時
ｏ，ｐ及びｑ＞0.0 という解が得られるので正確な色再
現が行われる。ｒ，ｇ，ｂからｏ，ｐ，ｑ，ｓ，ｔ，ｕ
への変換は、図１図示のハードウェアの構成で実施する
ことができる。In FIG. 2, six primary colors are displayed, and four areas (triangles OPQ, PSQ, T) that can be displayed by combining three primary colors are displayed.
This is a first embodiment in which the color range is divided into OQ and TQU).
For example, if the input color signal is in the range of the triangle OPQ on the chromaticity diagram, the solution of o, p and q> 0.0 is obtained when s = t = u = 0.0 in the equation (1), so it is accurate. Color reproduction is performed. From r, g, b to o, p, q, s, t, u
The conversion to can be performed by the hardware configuration shown in FIG.
【００１１】図１で３原色Ｒ，Ｇ及びＢ信号の入力レベ
ルがｒ′，ｇ′，ｂ′とあるのは、表示側の表示装置の
ガンマ特性が補正された色信号のＲ，Ｇ，Ｂの色成分を
示すもので、ガンマ特性γでその補正を戻し、原色変換
を行った後表示装置へ出力する前にガンマ特性補正をし
ている。判定器１は入力された色信号が色度図上、例え
ばｘｙ色度図上いかなる位置にあるか、例えば先に示し
た４つの３角形領域のどの領域にあるかを判定するもの
で、その判定の結果により縦に並んだ３つの係数器ｋの
組（６組）のどの組を使用するのか使用しないのかを選
択する。In FIG. 1, the input levels of the three primary color R, G, and B signals are r ', g', and b '. That is, the gamma characteristic of the display device on the display side is corrected. This indicates the B color component, and the gamma characteristic γ is corrected before being returned to the display device after the primary color conversion. The determiner 1 determines what position the input color signal is on the chromaticity diagram, for example, on the xy chromaticity diagram, for example, which region of the four triangular regions shown above. Depending on the result of the determination, it is selected which set (6 sets) of the three coefficient units k arranged vertically is used or not used.
【００１２】色度図上において、任意の色が与えられた
直線のどちら側にあるかは、例えば図２図示ｘｙ色度図
上において直線ＰＱの左にあるのか右にあるのかを調べ
るためには、色度図上直線ＰＱを表示する式（２）To determine which side of a straight line given an arbitrary color on the chromaticity diagram is, for example, to the left or right of the straight line PQ on the xy chromaticity diagram shown in FIG. Is an expression (2) for displaying a straight line PQ on the chromaticity diagram.
【数２】 ｋ1 ・ｒ＋ｋ2 ・ｇ＋ｋ3 ・ｂ＝０ （２） より係数ｋ1,ｋ2,ｋ3 を定め、これらの係数を入力色信
号のｒ，ｇ，ｂ成分にそれぞれ乗じてそれらの１次結合
をとり、結合の結果の正負により判定を行うものであ
る。この判定のハード構成は図３のような構成で、図３
の構成はとりもなおさず図１図示判定器１の中味であ
る。## EQU00002 ## k 1 .r + k 2 .g + k 3 .b = 0 (2) Determine the coefficients k 1 , k 2 and k 3 and multiply these coefficients by the r, g and b components of the input color signal, respectively. The primary combination of these is taken, and the judgment is made by the sign of the result of the combination. The hardware configuration for this determination is as shown in FIG.
The configuration of (1) is nothing but the contents of the judging device 1 shown in FIG.
【００１３】すなわち図３において信号ｒ，ｇ，ｂは入
力テレビジョン信号のＲ，Ｇ及びＢ成分にガンマ係数を
乗じて戻した信号、係数ｋ1,ｋ2,ｋ3 の係数の組は、図
２図示色度図上で例えば直線ＰＱに対しいずれの側に入
力色信号が存するかを判定するための乗算係数群、同様
に係数ｋ4,ｋ5,ｋ6 の係数の組および係数ｋ7,ｋ8,ｋ 9
の係数の組は直線ＯＱおよびＱＴに対するもの、今の場
合係数ｋ10, ｋ11, ｋ 12の係数の組は使用されない組と
いうことになる。That is, in FIG. 3, the signals r, g and b are input.
Gamma coefficient for the R, G and B components of the input television signal
Signal multiplied and returned, coefficient k1, k2, k3The set of coefficients is
2 Enter on either side of the straight line PQ on the chromaticity diagram
Multiplication coefficient group for determining whether there is a force signal, as well
Coefficient kFour, kFive, k6Set of coefficients and coefficient k7, k8, k 9
The set of coefficients for is for the straight lines OQ and QT,
Sum coefficient kTen, k11, k 12The set of coefficients in
Will be said.
【００１４】これら係数の組の各乗算出力の１次結合は
その正、負により判定器２〜５で０又は１と判定され、
それら出力は図１図示の係数器群ｋを作動させたり作動
させなかったりして、より具体的には以下（ａ）から
（ｄ）に示す動作をする。The first-order combination of each multiplication output of these coefficient sets is judged to be 0 or 1 by the judging devices 2 to 5 according to its positive or negative,
These outputs operate or do not operate the coefficient unit group k shown in FIG. 1, and more specifically perform the operations shown in (a) to (d) below.
【００１５】（ａ）入力の色が直線ＰＱの左の時 ３角形ＰＳＱと判断し、係数器ｋは(A) When the input color is on the left of the straight line PQ, it is judged as a triangular PSQ, and the coefficient unit k
【数３】 ｏ＝ｔ＝ｕ＝0.0 ｐ・Ｐ＋ｑ・Ｑ＋ｓ・Ｓ＝ｒ・Ｒ＋ｇ・Ｇ＋ｂ・Ｂ （３） で決まる係数になる。## EQU00003 ## o = t = u = 0.0 p.P + q.Q + s.S = r.R + g.G + b.B The coefficient is determined by (3).
【００１６】（ｂ）入力の色が直線ＰＱの右で直線ＯＱ
の上の時 ３角形ＯＰＱと判断し、係数器ｋは(B) The input color is a straight line OQ to the right of the straight line PQ.
When it is above, it is judged as a triangular OPQ, and the coefficient unit k is
【数４】 ｓ＝ｔ＝ｕ＝0.0 ｏ・Ｏ＋ｐ・Ｐ＋ｑ・Ｑ＝ｒ・Ｒ＋ｇ・Ｇ＋ｂ・Ｂ （４） で決まる係数になる。S = t = u = 0.0 o · O + p · P + q · Q = r · R + g · G + b · B The coefficient is determined by (4).
【００１７】（ｃ）入力の色が直線ＯＱの下で直線ＱＴ
の上の時 ３角形ＯＱＴと判断し、係数器ｋは(C) The input color is a straight line QT below the straight line OQ.
When it is above, it is judged as a triangular OQT, and the coefficient unit k is
【数５】 ｐ＝ｓ＝ｕ＝0.0 ｏ・Ｏ＋ｑ・Ｑ＋ｔ・Ｔ＝ｒ・Ｒ＋ｇ・Ｇ＋ｂ・Ｂ （５） で決まる係数になる。## EQU00005 ## p = s = u = 0.0 o.O + q.Q + t.T = r.R + g.G + b.B The coefficient is determined by (5).
【００１８】（ｄ）入力の色が直線ＱＴの下の時 ３角形ＴＱＵと判断し、係数器ｋは(D) When the input color is below the straight line QT, it is judged as a triangle TQU, and the coefficient unit k is
【数６】 ｏ＝ｐ＝ｓ＝0.0 ｔ・Ｔ＋ｑ・Ｑ＋ｕ・Ｕ＝ｒ・Ｒ＋ｇ・Ｇ＋ｂ・Ｂ （６） で決まる係数になる。## EQU00006 ## o = p = s = 0.0 t.T + q.Q + u.U = r.R + g.G + b.B The coefficient is determined by (6).
【００１９】次に本願第２の発明に係る第２の実施例に
ついて説明する。図４にその第２の実施例の構成を示
す。第１の実施例は入力の色に対応して１画素ごとに係
数器ｋを取り変えるためハードウェアの規模が大きくな
るが、図４では係数を一定としているためハードウェア
の規模は小さい。この構成では、６角形ＯＰＳＱＵＴの
なかの一部の色が完全には再現されない場合もあるが、
実用上全く問題はない。Next, a second embodiment according to the second invention of the present application will be described. FIG. 4 shows the configuration of the second embodiment. In the first embodiment, the scale of the hardware is large because the coefficient unit k is changed for each pixel according to the input color, but the scale of the hardware is small because the coefficient is constant in FIG. 4, so the scale of the hardware is small. With this configuration, some colors in the hexagonal OPSQUT may not be completely reproduced,
There is no problem in practice.
【００２０】この図で、負クリップ及び反転出力Ｎ．
Ｃ．は以下の働きをするものである。すなわち入力ｘ
（図の左側）が正の時、右側に“ｘ”を出力し、下には
“０”を出力する。In this figure, the negative clip and inverted output N.
C. Has the following functions. Ie input x
When (left side of the figure) is positive, "x" is output on the right side and "0" is output on the lower side.
【００２１】入力ｘが負の時、右側に“０”を出力し、
下には“ｘ”を出力する。When the input x is negative, "0" is output on the right side,
"X" is output below.
【００２２】以下に図４の原理的な動作を説明する。式
（１）は、式（７）と変形できこれはｓ，ｔ，ｕを従属
変数として未知数がｏ，ｐ，ｑの３元３連立方程式であ
る。The principle operation of FIG. 4 will be described below. Expression (1) can be transformed into Expression (7), which is a ternary simultaneous equation with unknowns o, p, and q with s, t, and u as dependent variables.
【数７】 ｏ・Ｏ＋ｐ・Ｐ＋ｑ・Ｑ＝ｒ・Ｒ＋ｇ・Ｇ＋ｂ・Ｂ−ｓ・Ｓ−ｔ・Ｔ−ｕ・Ｕ （７）[Equation 7] o · O + p · P + q · Q = r · R + g · G + b · Bs · St · Tu · U (7)
【００２３】ｓ，ｔ，ｕを単純にｒ，ｇ，ｂの１次結合
で表現すると、式（７）の制約により、原理的にはｏ，
ｐ，ｑ，ｓ，ｔ，ｕすべての値が０または正で表現でき
る筈の６角形ＯＰＳＱＵＴの内側の多くの色に対して、
どれかの値が負になる。従って、正しい色再現ができな
い。図４ではこれを改善するため、負クリップ及び反転
出力Ｎ．Ｃ．を用いている。この回路は、ｓ，ｔ，ｕが
負の時は“０”を出力しその補正項をｏ，ｐ，ｑに加え
るもので、上記の問題を大幅に改善できる。If s, t, u are simply expressed by a linear combination of r, g, b, in principle, o,
For many colors inside the hexagonal OPSQUT that should be able to represent all values of p, q, s, t, u as 0 or positive,
One of the values becomes negative. Therefore, correct color reproduction cannot be performed. In FIG. 4, in order to improve this, a negative clip and an inverted output N.N. C. Is used. This circuit outputs "0" when s, t, and u are negative and adds the correction term to o, p, and q, so that the above problems can be greatly improved.
【００２４】なお図の係数器ｋの係数は、６角形ＯＰＳ
ＱＵＴ内部のほとんどの色に対してｏ，ｐ，ｑ，ｓ，
ｔ，ｕすべての値が０または正になるようにあらかじめ
計算で決めておく。The coefficient of the coefficient unit k in the figure is a hexagonal OPS.
O, p, q, s, for most colors inside the QUT
Predetermined by calculation so that all values of t and u are 0 or positive.
【００２５】また図５は、図４を４原色へ応用した場合
のハード構成を示している。FIG. 5 shows a hardware structure when FIG. 4 is applied to four primary colors.
【００２６】次に本願発明をより具体的に理解するため
に、Ｒ，Ｇ，Ｂ，Ｏ，Ｐ，Ｑ，Ｓ，Ｔ，Ｕに具体的に色
度図上の数値を与えて図１と図４図示ハード構成の説明
をする。例として、以下の色度点の場合について考察す
る。Next, in order to understand the present invention more concretely, numerical values on the chromaticity diagram are given to R, G, B, O, P, Q, S, T, and U, and the results are shown in FIG. The hardware configuration shown in FIG. 4 will be described. As an example, consider the following chromaticity point case.
【数８】 Ｒ(0.393, 0.212, 0.019),Ｇ(0.365, 0.701, 0.112),Ｂ(0.192, 0.087, 0.958), Ｏ(0.640, 0.360, 0.000),Ｐ(0.332, 0.620, 0.048),Ｑ(0.153, 0.024, 0.823), Ｓ(0.028, 0.398, 0.574),Ｔ(0.705, 0.295, 0.000),Ｕ(0.169, 0.007, 0.824) （８）[Equation 8] R (0.393, 0.212, 0.019), G (0.365, 0.701, 0.112), B (0.192, 0.087, 0.958), O (0.640, 0.360, 0.000), P (0.332, 0.620, 0.048), Q (0.153, 0.024, 0.823), S (0.028, 0.398, 0.574), T (0.705, 0.295, 0.000), U (0.169, 0.007, 0.824) (8)
【００２７】式（８）で各原色は色の三刺激値Ｘ，Ｙ，
Ｚで表示され、ｘｙ色度図上で示せば図６のようにな
る。In equation (8), each primary color is the tristimulus value X, Y,
It is displayed as Z and shown in FIG. 6 when shown on the xy chromaticity diagram.
【００２８】入力された色ｒ，ｇ，ｂに対して、実施例
１（図１）では、以下のように領域判定され信号レベル
が計算される。 （ａ）−0.7949・ｒ＋0.0569・ｇ＋0.0487・ｂ＞0.0 の
ときIn the first embodiment (FIG. 1), the input colors r, g and b are subjected to area determination and the signal level is calculated as follows. (A) -0.7949 ・ r + 0.0569 ・ g + 0.0487 ・ b> 0.0
【数９】 ｏ＝ｔ＝ｕ＝0.0 ｐ＝ 0.9623・ｒ＋1.0837・ｇ＋0.0568・ｂ ｑ＝ 0.6681・ｒ＋0.0226・ｇ＋1.1182・ｂ ｓ＝−1.0057・ｒ＋0.0719・ｇ＋0.0617・ｂ （９）[Equation 9] o = t = u = 0.0 p = 0.9623 ・ r + 1.0837 ・ g + 0.0568 ・ b q = 0.6681 ・ r + 0.0226 ・ g + 1.1182 ・ bs -1.0057 ・ r + 0.0719 ・ g + 0.0617 ・b (9)
【００２９】（ｂ）−0.7949・ｒ＋0.0569・ｇ＋0.0487
・ｂ＜0.0 かつ−0.0082・ｒ＋0.5452・ｇ＋0.0552・ｂ
＞0.0 のとき(B) -0.7949 ・ r + 0.0569 ・ g + 0.0487
・ B <0.0 and -0.0082 ・ r + 0.5452 ・ g + 0.0552 ・ b
> 0.0
【数１０】 ｓ＝ｔ＝ｕ＝0.0 ｏ＝ 0.6182・ｒ−0.0442・ｇ−0.0378・ｂ ｐ＝−0.0173・ｒ＋1.1538・ｇ＋0.1168・ｂ ｑ＝ 0.0238・ｒ＋0.0687・ｇ＋1.1577・ｂ (10)S = t = u = 0.0 o = 0.6182 ・ r-0.0442 ・ g-0.0378 ・ bp = -0.0173 ・ r + 1.1538 ・ g + 0.1168 ・ b q = 0.0238 ・ r + 0.0687 ・ g + 1.1577 ・b (10)
【００３０】（ｃ）−0.0082・ｒ＋0.5452・ｇ＋0.0552
・ｂ＜0.0 かつ0.0511・ｒ＋0.5820・ｇ＋0.0557・ｂ＞
0.0 のとき(C) -0.0082 ・ r + 0.5452 ・ g + 0.0552
・ B <0.0 and 0.0511 ・ r + 0.5820 ・ g + 0.0557 ・ b>
When 0.0
【数１１】 ｐ＝ｓ＝ｕ＝0.0 ｏ＝ 0.5274・ｒ＋6.0051・ｇ＋0.5745・ｂ ｑ＝ 0.0228・ｒ＋0.1360・ｇ＋1.1645・ｂ ｔ＝ 0.0745・ｒ−4.9629・ｇ−0.5023・ｂ (11)[Equation 11] p = s = u = 0.0 o = 0.5274 ・ r + 6.00051 ・ g + 0.5745 ・ b q = 0.0228 ・ r + 0.1360 ・ g + 1.1645 ・ b t = 0.0745 ・ r-4.9629 ・ g-0.5023 ・ b (11)
【００３１】（ｄ）0.0511・ｒ＋0.5820・ｇ＋0.0557・
ｂ＜0.0 のとき(D) 0.0511 ・ r + 0.5820 ・ g + 0.0557 ・
When b <0.0
【数１２】 ｏ＝ｐ＝ｓ＝0.0 ｑ＝ 2.0815・ｒ＋23.579・ｇ＋3.4070・ｂ ｔ＝ 0.5994・ｒ＋1.0138・ｇ＋0.0694・ｂ ｕ＝−2.0562・ｒ−23.414・ｂ−2.2398・ｂ[Equation 12] o = p = s = 0.0 q = 2.0815 · r + 23.579 · g + 3.4070 · b t = 0.5994 · r + 1.0138 · g + 0.0694 · b u = −2.0562 · r−23.414 · b−2.2398 · b
【００３２】実施例２（図４）では、以下の計算が行わ
れる。In the second embodiment (FIG. 4), the following calculation is performed.
【数１３】 ｆ(x) ＝ｘ，ｘ＞0.0 ０，ｘ＜0.0 ｇ(x) ＝０，ｘ＞0.0 ｘ，ｘ＜0.0 ｓ1 ＝−0.9182・ｒ＋0.0825・ｇ＋0.1979・ｂ ｔ1 ＝ 0.2936・ｒ−1.8853・ｇ−0.3339・ｂ ｕ1 ＝−0.1249・ｒ−1.3786・ｇ＋0.7049・ｂ としたとき ｏ＝−0.2972・ｒ＋2.3798・ｇ＋0.4522・ｂ−0.6147・ｇ（ｓ1) ＋1.2189・ｇ（ｔ1)＋0.0547・ｇ（ｕ1) ｐ＝ 0.9378・ｒ＋0.5533・ｇ−0.1118・ｂ＋0.9741・ｇ（ｓ1) −0.2325・ｇ（ｔ1)−0.0593・ｇ（ｕ1) ｑ＝ 0.7335・ｒ＋1.4264・ｇ＋0.3273・ｂ＋0.6406・ｇ（ｓ1) ＋0.0136・ｇ（ｔ1)＋1.0047・ｇ（ｕ1) ｓ＝ ｆ（ｓ1) ｔ＝ ｆ（ｔ1) ｕ＝ ｆ（ｕ1) (13)F (x) = x, x> 0.0 0, x <0.0 g (x) = 0, x> 0.0 x, x <0.0 s 1 = −0.9182 · r + 0.0825 · g + 0.1979 · bt 1 = 0.2936 · r-1.8853 · g-0.3339 · b u 1 = -0.1249 · r-1.3786 · g + 0.7049 · b and the time o = -0.2972 · r + 2.3798 · g + 0.4522 · b-0.6147 · g ( s 1 ) +1.2189 ・ g (t 1 ) +0.0547 ・ g (u 1 ) p = 0.9378 ・ r + 0.5533 ・ g-0.1118 ・ b + 0.9741 ・ g (s 1 ) -0.2325 ・ g (t 1 ) -0.0593 ・ g (u 1 ) q = 0.7335 ・ r + 1.4264 ・ g + 0.3273 ・ b + 0.6406 ・ g (s 1 ) +0.0136 ・ g (t 1 ) +1.0047 ・ g (u 1 ) s = f (S 1 ) t = f (t 1 ) u = f (u 1 ) (13)
【００３３】いくつかの色サンプルについて、（９）〜
(13)式がどのような値を生じるのかを説明する。 （ｅ）ｒ＝−0.5 ，ｇ＝1.0 ，ｂ＝1.0 は場合（図６の
Ｃ１）For some color samples, (9)-
Explain what value Eq. (13) produces. (E) In the case of r = -0.5, g = 1.0, b = 1.0 (C1 in FIG. 6)
【００３４】実施例１では−0.7949・ｒ＋0.0569・ｇ＋
0.0487・ｂ＝0.503 ＞0.0 となるため（ａ）と判定さ
れ、式（９）よりIn Example 1, -0.7949.r + 0.0569.g +
Since 0.0487 · b = 0.503> 0.0, it is judged as (a), and from equation (9)
【数１４】 ｏ＝0.0 ，ｐ＝0.659 ，ｑ＝0.807 ，ｓ＝0.637 ，ｔ＝0.0 ，ｕ＝0.0 (14)(14) o = 0.0, p = 0.659, q = 0.807, s = 0.637, t = 0.0, u = 0.0 (14)
【００３５】実施例２ではｓ1 ＝0.740 ，ｔ1 ＝−2.36
7 ，ｕ＝−0.637 よりIn the second embodiment, s 1 = 0.740 and t 1 = −2.36.
7, u = -0.637
【数１５】 ｏ＝0.062 ，ｐ＝0.559 ，ｑ＝0.741 ，ｓ＝0.740 ，ｔ＝0.0 ，ｕ＝0.0 (15) （ｆ）ｒ＝1.0 ，ｇ＝1.0 ，ｂ＝1.0 の場合（図６のＣ
２）## EQU15 ## In the case of o = 0.062, p = 0.559, q = 0.741, s = 0.740, t = 0.0, u = 0.0 (15) (f) r = 1.0, g = 1.0, b = 1.0 (see FIG. 6) C
2)
【００３６】実施例１では−0.7949・ｒ＋0.0569・ｇ＋
0.0487・ｂ＝−0.689 ＜0.0 −0.0082・ｒ＋0.5452・ｇ＋0.0552・ｂ＝ 0.592 ＞0.
0 となるため（ｂ）と判定され式(10)よりIn Example 1, -0.7949 · r + 0.0569 · g +
0.0487 ・ b = -0.689 <0.0 -0.0082 ・ r + 0.5452 ・ g + 0.0552 ・ b = 0.592> 0.
Since it is 0, it is judged as (b) and from equation (10)
【数１６】 ｏ＝0.536 ，ｐ＝1.253 ，ｑ＝1.250 ，ｓ＝0.0 ，ｔ＝0.0 ，ｕ＝0.0 (16)## EQU16 ## o = 0.536, p = 1.253, q = 1.250, s = 0.0, t = 0.0, u = 0.0 (16)
【００３７】実施例２ではｓ1 ＝−0.638 ，ｔ1 ＝−1.
926 ，ｕ＝−0.799 よりIn the second embodiment, s 1 = -0.638, t 1 = -1.
From 926, u = -0.799
【数１７】 ｏ＝0.536 ，ｐ＝1.253 ，ｑ＝1.250 ，ｓ＝0.0 ，ｔ＝0.0 ，ｕ＝0.0 (17) （ｇ）ｒ＝1.0 ，ｇ＝−0.05，ｂ＝1.0 の場合（図６の
Ｃ３）## EQU17 ## In the case of o = 0.536, p = 1.253, q = 1.250, s = 0.0, t = 0.0, u = 0.0 (17) (g) r = 1.0, g = -0.05, b = 1.0 (Fig. 6) C3)
【００３８】実施例１では−0.0082・ｒ＋0.5452・ｇ＋
0.0552・ｂ＝−0.030 ＜0.0 0.0511・ｒ＋0.5820・ｇ＋0.0557・ｂ＝ 0.028 ＞0.0
となるため（ｃ）と判定され式(11)よりIn Example 1, −0.0082 · r + 0.5452 · g +
0.0552 ・ b = -0.030 <0.0 0.0511 ・ r + 0.5820 ・ g + 0.0557 ・ b = 0.028 ＞ 0.0
Therefore, it is judged as (c), and from equation (11)
【数１８】 ｏ＝0.285 ，ｐ＝0.0 ，ｑ＝0.132 ，ｓ＝0.0 ，ｔ＝0.272 ，ｕ＝0.0 (18)[Equation 18] o = 0.285, p = 0.0, q = 0.132, s = 0.0, t = 0.272, u = 0.0 (18)
【００３９】実施例２ではｓ1 ＝−0.903 ，ｔ1 ＝0.35
5 ，ｕ1 ＝0.015 よりIn the second embodiment, s 1 = -0.903, t 1 = 0.35
From 5, u 1 = 0.015
【数１９】 ｏ＝0.184 ，ｐ＝0.020 ，ｑ＝0.117 ，ｓ＝0.0 ，ｔ＝0.355 ，ｕ＝0.015 (19) （ｈ）ｒ＝0.2 ，ｇ＝−0.14，ｂ＝1.0 の場合（図６の
Ｃ４）## EQU19 ## In the case of o = 0.184, p = 0.020, q = 0.117, s = 0.0, t = 0.355, u = 0.015 (19) (h) r = 0.2, g = -0.14, b = 1.0 (Fig. 6) C4)
【００４０】実施例１では0.0511・ｒ＋0.5820・ｇ＋0.
0557・ｂ＝−0.016 ＜0.0 となるため（ｄ）と判定され
式(12)よりIn Example 1, 0.0511 · r + 0.5820 · g + 0.
Since 0557 ・ b = -0.016 <0.0, it is determined as (d) and from equation (12)
【数２０】 ｏ＝0.0 ，ｐ＝0.0 ，ｑ＝0.522 ，ｓ＝0.0 ，ｔ＝0.047 ，ｕ＝0.627 (20)(20) o = 0.0, p = 0.0, q = 0.522, s = 0.0, t = 0.047, u = 0.627 (20)
【００４１】実施例２ではｓ1 ＝0.003 ，ｔ1 ＝−0.01
1 ，ｕ＝0.773 よりIn the second embodiment, s 1 = 0.003, t 1 = -0.01
From 1, u = 0.773
【数２１】 ｏ＝0.046 ，ｐ＝0.001 ，ｑ＝0.274 ，ｓ＝0.003 ，ｔ＝0.0 ，ｕ＝0.773 (21)(21) o = 0.046, p = 0.001, q = 0.274, s = 0.003, t = 0.0, u = 0.773 (21)
【００４２】この例で示したように、本発明は３角形Ｒ
ＧＢの外側の色でも３原色信号を多原色信号へ変換する
ことができる。As shown in this example, the present invention is a triangle R
It is possible to convert three primary color signals into multi-primary color signals even with colors outside the GB.
【００４３】以上実施例により本願発明を詳細に説明し
てきたが、本願発明はこれに限定されることなく、各種
の変形、変更の可能なことは当業者にとり自明であろ
う。Although the present invention has been described in detail with reference to the embodiments, the present invention is not limited to this, and it will be apparent to those skilled in the art that various modifications and changes can be made.
【００４４】[0044]
【発明の効果】本発明原色変換方法によれば、３原色方
式になるカラーテレビジョン信号の色信号でｘｙ色度図
上３原色Ｒ，Ｇ及びＢの３原色点が作る３角形外の色度
点の色も正確に再現することができ、彩度の高い色も正
しく表示され、しかもその変換方法を構成するハード構
成も比較的簡単である利点を有する。According to the primary color conversion method of the present invention, a color signal of a color television signal of the three primary color system is a color outside the triangle formed by the three primary color points of the three primary colors R, G and B on the xy chromaticity diagram. The advantage is that the color of the point can be accurately reproduced, the color with high saturation is also displayed correctly, and the hardware configuration of the conversion method is relatively simple.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明第１の実施例のハード構成例FIG. 1 is a hardware configuration example of a first embodiment of the present invention.
【図２】６原色表示で色度図上領域分割の例[Fig. 2] Example of area division on chromaticity diagram with 6 primary colors display
【図３】第１の実施例判定器１の構成例FIG. 3 is a configuration example of a first embodiment determiner 1.
【図４】本発明第２の実施例のハード構成例FIG. 4 is a hardware configuration example of the second embodiment of the present invention.
【図５】本発明の他の実施例（４原色）の構成例FIG. 5 is a structural example of another embodiment (four primary colors) of the present invention.
【図６】６原色表示の色度図上の具体例FIG. 6 is a specific example on a chromaticity diagram for displaying six primary colors.
【図７】色度図を用いた現行標準方式の表示FIG. 7: Display of current standard method using chromaticity diagram
【図８】６原色表示の色度図上の例FIG. 8: Example of chromaticity diagram for 6 primary color display
１〜５ 判定器 γ ガンマ補正 γ-1 逆ガンマ補正 ｋ 係数器 ｋ1 〜ｋ12 係数器 N.C. 負クリップ及び反転出力1 to 5 decision device γ gamma correction γ -1 inverse gamma correction k coefficient unit k 1 to k 12 coefficient unit NC negative clip and inverted output
Claims (3)
の輝度信号Ｙと２つの色差信号Ｃ1 およびＣ2 を、逆マ
トリクス回路を介して３原色信号Ｒ，Ｇ及びＢに変換
し、変換により得られた３原色信号Ｒ，ＧおよびＢが色
度図上いかなる位置にあるかを判定し、その判定結果に
基づき別に色度図上で設けた３原色を越える多原色の中
から３つの原色を選択し、これらの１次結合により入力
色信号を表わし、受信側での多原色表示に備えるように
したことを特徴とする多原色表示用原色変換方法。1. A transmitted luminance signal Y of a color television signal and two color difference signals C 1 and C 2 are converted into three primary color signals R, G and B through an inverse matrix circuit and obtained by conversion. The positions of the three primary color signals R, G and B are determined on the chromaticity diagram, and based on the determination result, three primary colors are selected from the multiple primary colors separately set on the chromaticity diagram. A primary color conversion method for multi-primary color display, characterized in that an input color signal is selected by a primary combination of these to prepare for multi-primary color display on the receiving side.
の輝度信号Ｙと２つの色差信号Ｃ1 およびＣ2 を、逆マ
トリクス回路を介して３原色信号Ｒ，ＧおよびＢに変換
し、受信側で別に色度図上で設けた３原色を越える多原
色信号をそれぞれ前記３原色信号Ｒ，ＧおよびＢの１次
結合として計算して出力し、前記３原色を越える多原色
の中から３つの原色を選択し、それ以外の原色の前記１
次結合の出力が負になる時にはその出力を零にするとと
もに補正信号を用意し、前記選択された３つの原色の前
記１次結合の出力にその補正信号を加算して出力し、受
信側での多原色表示に備えるようにしたことを特徴とす
る多原色表示用原色変換方法。2. The transmitted luminance signal Y of the color television signal and the two color difference signals C 1 and C 2 are converted into three primary color signals R, G and B through an inverse matrix circuit, and at the receiving side. Separately, multi-primary color signals exceeding three primary colors provided on the chromaticity diagram are calculated and output as primary combinations of the three primary color signals R, G and B, respectively, and three primary colors out of the three primary colors exceeding the three primary colors are output. Select one of the other primary colors
When the output of the secondary combination becomes negative, the output is set to zero and a correction signal is prepared, and the correction signal is added to the outputs of the primary combination of the selected three primary colors, and the result is output. The primary color conversion method for multi-primary color display characterized by being prepared for multi-primary color display.
示装置のガンマ補正をみこんで逆ガンマ補正されて伝送
される場合には、原色変換に先き立ち３原色信号Ｒ，Ｇ
およびＢをそれぞれガンマ補正し、出力多原色信号を逆
ガンマ補正することを特徴とする請求項１または２記載
の多原色表示用原色変換方法。3. When the color television signal is transmitted after being subjected to inverse gamma correction in consideration of the gamma correction of the receiving side display device, the three primary color signals R and G are transmitted prior to the primary color conversion.
3. The method of converting primary colors for multi-primary color display according to claim 1, wherein gamma correction is performed on B and B, and inverse gamma correction is performed on the output multi-primary color signal.
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|---|---|---|---|
| JP04281793A JP3305794B2 (en) | 1993-03-03 | 1993-03-03 | Primary color conversion method and apparatus for multi-primary color display |
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|---|---|---|---|
| JP04281793A JP3305794B2 (en) | 1993-03-03 | 1993-03-03 | Primary color conversion method and apparatus for multi-primary color display |
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| Publication Number | Publication Date |
|---|---|
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| JP3305794B2 JP3305794B2 (en) | 2002-07-24 |
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|---|---|---|---|
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| US6538742B1 (en) | 1999-02-25 | 2003-03-25 | Olympus Optical Co., Ltd. | Color reproducing system |
| EP1450302A1 (en) * | 2001-11-02 | 2004-08-25 | Telecommunications Advancement Organization of Japan | Color reproduction system |
| EP1571829A2 (en) * | 2004-02-26 | 2005-09-07 | Samsung Electronics Co., Ltd. | Method and apparatus for converting color spaces and multi-color display |
| JP2005303989A (en) * | 2004-03-18 | 2005-10-27 | Sharp Corp | Color signal conversion device, display unit, color signal conversion program, recording media capable of reading computer recording the color signal conversion program, color signal conversin method, color display unit and color display method |
| US6980219B2 (en) | 2003-10-21 | 2005-12-27 | Clairvoyante, Inc | Hue angle calculation system and methods |
| WO2006106457A1 (en) * | 2005-04-04 | 2006-10-12 | Koninklijke Philips Electronics N.V. | Method of converting signals for multi-primary color display |
| JP2006293332A (en) * | 2005-03-17 | 2006-10-26 | Canon Inc | Image display device |
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