CN101547362B - Compatible transmission method for wide-gamut digital TV signals - Google Patents

Abstract

The invention relates to digital TV technology and wide-gamut technology, in particular to a compatible transmission method for wide-gamut digital TV signals. The invention provides the method that transmits wide-gamut images and video signals which exist in the nature and can be visually perceived on the premise of not changing the prior conventional gamut digital TV transmission equipment for various terminal display devices to reproduce richer and more saturated color. The technical proposal adopted by the method comprises the following steps: the color gamut of real surface color of a maximum object confirmed by ITU-R BT.1361 is used, according to gamma correction characteristics defined by CIE 61966-2-4, under the conditions of not changing system fundamental color and standard whiteness coordinates of ITU-R BT.709, a pair of new color difference signals are conducted, encoded, transmitted and reconducted to realize the compatible transmission of the prior conventional gamut HDTV system and the reproduction of wide-gamut HDTV images and videos. The method is mainly used for digital TV signal transmission.

Description

The compatible transmission method of wide-gamut digital TV signals

Technical field

The present invention relates to digital television techniques, wide colour gamut technology, relate in particular to the compatible transmission method of wide-gamut digital TV signals.

Background technology

Development along with modern colorimetry research and Digital Television (DTV), deepened cognition on the one hand to nature color and vision physiological and the psychological stimulation impression of checking colors, wide colour gamut rest image and video motion image also can be gathered, write down, handle and be reappeared to camera-shooting and recording device, transmission system and display device on the other hand, and making, transmission and the representation of wide colour gamut high definition TV (HDTV) program have also become possibility.

Given this, 1998, International Telecommunication Union formulated " the international uniform colourity and the correlation properties of following TV and picture system " recommendation ITU-R BT.1361.The Pointer body surface look colour gamut that ITU-R BT.1361 proposes Mr. Pointer according to numerous measured datas is as the target color gamut of wide colour gamut video, approximately thinks that this colour gamut included nature existence, the appreciable most colors of human eye.

The Pointer colour gamut is defined by the real-world object surface colour of the 576 kinds of different brightness (lightness) that filter out in a large amount of measured datas, different tone (form and aspect) and corresponding maximum saturation (chroma), is " maximum " " real surface look colour gamut ".The Pointer colour gamut can be described with multiple mode, and the CIE1976L*u*v* three-dimensional color space commonly used comprising television system characterizes.The Pointer colour gamut evenly is divided into 16 intensity levels with the brightness of these colors, and each luminance plane is divided into 36 kinds of tones at interval by the hue angle such as grade again, totally 576 colors.

2006, International Electrotechnical Commission (IEC) worked out " color management---towards expanded color gamut YCC color space of Video Applications---xvYCC " recommendation CIE 61966-2-4 (xvYCC) again.CIE 61966-2-4 no longer limits the primary colour signal amplitude range, adopts centrosymmetric γ correcting feature, and the quantized level usable range is loosened to 1～254.Satisfy color that the display of this suggestion can show and be approximately present sRGB colour gamut 1.8 times.

Yet wide colour gamut HDTV signal is difficult to transmit in the existing conventional colour gamut HDTV transmission system of ITU-R BT.709 recommendation standard.The conventional colour gamut HDTV system that makes up based on ITU-R BT.709 three primary colors and standard white, but colour gamut only reaches 33.3% of vision perception colour gamut approximately.

Owing in certain period of history, DTV system conversion is become wide colour gamut HDTV system and unrealistic, make in the existing conventional colour gamut HDTV transmission system of ITU-RBT.709, seek to transmit the principle and the method for wide colour gamut HDTV signal, become problem demanding prompt solution.

Summary of the invention

For overcoming the deficiencies in the prior art, the objective of the invention is to, a kind of derivation, coding, transmission and method for reconstructing of wide colour gamut TV signal is provided.Adopt this method not changing under the existing conventional gamut digital TV transmission equipment prerequisite, the existence of transmission nature, the appreciable wide color gamut images of vision and vision signal are for abundanter, the more saturated color of various terminal presentation facility representation.And widen the colour gamut of transmission of conventional gamut digital TV system compatible and reproduced image and video, strengthen antijamming capability simultaneously.The technical solution used in the present invention is the compatible transmission method of wide-gamut digital TV signals, comprises the following steps:

By the formula in light transfer characteristic, analoging brightness and color difference signal encoding equtions, digital brightness and the color difference signal encoding equtions, the normalization primary colour signal is carried out γ proofread and correct, encode and quantize successively, obtain the wide-gamut digital TV signals of compatible transmission.

Light transfer characteristic:

The present invention is making a start, and adopts light transfer characteristic shown in the following formula, in the formula, and E _R, E _GAnd E _BFor digital television system by the red, green, blue three primary colors, press the additive color mixture principle, the required tristimulus signals magnitude of voltage of proportioning shades of colour, still adopt ITU-RBT.709 three primary colors coordinate and reference white, for enlarge colour gamut and with the international standard compatibility, the light transfer characteristic that adopts is the γ correction function of CIE61966-2-4 standard, comes the non-linear electro-optic transfer characteristic precorrection to display device, and the primary colour signal after the correction is the E ' in the formula following formula _R, E ' _GAnd E ' _B:

$\left\{\begin{array}{cc}{E}_R^{\&prime;}=-1.099\&times;{(-E_R)}^{0.45}+0.099& E_R\&le;-0.018\\ E_R^{\&prime;}=4.50\&times;E_R& -0.018<E_R<0.018\\ E_R^{\&prime;}=1.099\&times;{\left(E_R\right)}^{0.45}-0.099& E_R\&GreaterEqual;0.018\end{array}\right.$

$\left\{\begin{array}{cc}{E}_G^{\&prime;}=-1.099\&times;{(-E_G)}^{0.45}+0.099& E_G\&le;-0.018\\ E_G^{\&prime;}=4.50\&times;E_G& -0.018<E_G<0.018\\ E_G^{\&prime;}=1.099\&times;{\left(E_G\right)}^{0.45}-0.099& E_G\&GreaterEqual;0.018\end{array}\right.$

$\left\{\begin{array}{cc}{E}_B^{\&prime;}=-1.099\&times;{(-E_B)}^{0.45}+0.099& E_B\&le;-0.018\\ E_B^{\&prime;}=4.50\&times;E_B& -0.018<E_B<0.018\\ E_B^{\&prime;}=1.099\&times;{\left(E_B\right)}^{0.45}-0.099& E_B\&GreaterEqual;0.018\end{array}\right.$

Following formula adopts center symmetry γ correction function.

Analoging brightness and color difference signal encoding equtions:

Analog luminance signal E ' _YWith two analog color difference signal E ' _CB, E ' _CREncoding equtions as shown in the formula, the rotation amount of color difference signal addition color space coordinates and translational movement are embodied in matrix A and matrix B in the formula respectively:

$\left[\begin{array}{c}{E}_Y^{\&prime;}\\ E_{\mathrm{CB}}^{\&prime;}\\ E_{\mathrm{CR}}^{\&prime;}\end{array}\right]=A\&times;\left[\begin{array}{c}{E}_R^{\&prime;}\\ E_G^{\&prime;}\\ E_B^{\&prime;}\end{array}\right]+B=\left[\begin{array}{ccc}0.2126& 0.7152& 0.0722\\ -0.5196& 0.2635& 0.2561\\ 0.0536& -0.5920& 0.5384\end{array}\right]\&times;\left[\begin{array}{c}{E}_R^{\&prime;}\\ E_G^{\&prime;}\\ E_B^{\&prime;}\end{array}\right]+\left[\begin{array}{c}0\\ -0.0451\\ 0.0751\end{array}\right]$

Press following formula, guarantee whole transmission of Pointer colour gamut, E ' _Y, E ' _CBAnd E ' _CRThe codomain scope be respectively 0～1 ,-0.5～+ 0.5 and-0.5～+ 0.5, they can be in the transmission of conventional colour gamut DTV system compatible.

Digital brightness and color difference signal encoding equtions:

Adopt 8 bit quantization precision, as shown in the formula, D ' _{Y (8)}Shown in luminance signal digital coding equation consistent with conventional colour gamut, but D ' _{CB (8)}And D ' _{CR (8)}Shown in two color difference signal digital coding equations be different from conventional colour gamut, be reflected as the dc offset 139 and 112 in the formula:

D′ _Y(8)＝INT[(219×E′ _Y+16)]

D′ _CB(8)＝INT[(224×E′ _CB+139)]

D′ _CR(8)＝INT[(224×E′ _CB+112)]

Press the formula in digital brightness and color difference signal decoding equation, analoging brightness and color difference signal decoding equation, the display primary signal successively, wide colour gamut DTV signal inverse quantization, decoding and the anti-γ that receives proofreaied and correct, rebuild wide colour gamut primary colours drive signal, the wide colour gamut of representation, high quality graphic or video on screen.

Comprise following concrete steps:

Digital brightness and color difference signal decoding equation:

Terminal equipment adopts following formula to digital YUV D ' _YAnd D ' _CB, D ' _CRCarry out inverse quantization, rebuild analoging brightness and two color difference signal E ' _YAnd E ' _CB, E ' _CR:

E′ _Y＝(D′ _Y-16)/219

E′ _CB＝(D′ _CB-139)/224

E′ _CR＝(D′ _CR-112)/224

Analoging brightness and color difference signal decoding equation:

Press following formula decoding analoging brightness and two color difference signal E ' _YAnd E ' _CB, E ' _CR, recover simulation tristimulus signals E ' _R, E ' _GAnd E ' _B:

$\left[\begin{array}{c}{E}_R^{\&prime;}\\ E_G^{\&prime;}\\ E_B^{\&prime;}\end{array}\right]=\left[\begin{array}{ccc}1& -1.4577& 0.5593\\ 1& 0.3768& -0.3134\\ 1& 0.5595& 1.4571\end{array}\right]\&times;\left[\begin{array}{c}{E}_Y^{\&prime;}\\ E_{\mathrm{CB}}^{\&prime;}+0.04512\\ E_{\mathrm{CR}}^{\&prime;}-0.0751\end{array}\right]$

The display primary signal:

Press following formula and rebuild display primary signal E _R, E _G, E _B:

$\left\{\begin{array}{cc}{E}_R=-\left[{\left(\frac{E_R^{\&prime;}-0.099}{-1.099}\right)}^{\frac{1}{0.45}}\right]& E_R^{\&prime;}\&le;-0.081\\ E_R=\frac{E_R^{\&prime;}}{4.5}& -0.081<E_R^{\&prime;}<0.081\\ E_R={\left(\frac{E_R^{\&prime;}+0.099}{1.099}\right)}^{\frac{1}{0.45}}& E_R^{\&prime;}\&GreaterEqual;0.081\end{array}\right.$

$\left\{\begin{array}{cc}{E}_G=-\left[{\left(\frac{E_G^{\&prime;}-0.099}{-1.099}\right)}^{\frac{1}{0.45}}\right]& E_G^{\&prime;}\&le;-0.081\\ E_G=\frac{E_G^{\&prime;}}{4.5}& -0.081<E_G^{\&prime;}<0.081\\ E_G={\left(\frac{E_G^{\&prime;}+0.099}{1.099}\right)}^{\frac{1}{0.45}}& E_G^{\&prime;}\&GreaterEqual;0.081\end{array}\right.$

$\left\{\begin{array}{cc}{E}_B=-\left[{\left(\frac{E_B^{\&prime;}-0.099}{-1.099}\right)}^{\frac{1}{0.45}}\right]& E_B^{\&prime;}\&le;-0.081\\ E_B=\frac{E_B^{\&prime;}}{4.5}& -0.081<E_B^{\&prime;}<0.081\\ E_B={\left(\frac{E_B^{\&prime;}+0.099}{1.099}\right)}^{\frac{1}{0.45}}& E_B^{\&prime;}\&GreaterEqual;0.081\end{array}\right.$

The present invention can bring following effect: a pair of new color difference signal that uses the present invention to propose, encoded, transmission, decoding processing, can not change under the conventional colour gamut HDTV transmission system prerequisite, realize wide colour gamut HDTV signal transmission and reconstruction, and improve them and resist the transmission interference performance.The wide colour gamut of the present invention compatible and image, video, high-quality with its transmission, acquisition tremendous economic and social benefit.

Embodiment

The present invention proposes a kind of compatible transmission method of wide-gamut digital TV signals.The largest object real surface look colour gamut that this invention is confirmed with ITU-R BT.1361, be that the Pointer colour gamut is the transmission objectives colour gamut, press the γ correcting feature of CIE 61966-2-4 definition, do not changing under ITU-R BT.709 system's primary colours and the reference white level coordinate condition, derive, encode, transmit and rebuild a pair of new color difference signal, realize and existing conventional colour gamut HDTV system compatible transmission and wide colour gamut HDTV image of representation and video.Compressed coefficient size of a pair of color difference signal that this invention proposes is approaching, and more conventional colour gamut DTV system adopts the compressed coefficient of two color difference signals little, resists the transmission interference thereby be beneficial to.

The DTV system transmits luminance signal and two color difference signals.For transmitting wide colour gamut HDTV signal with the existing conventional colour gamut HDTV system compatible that makes up by ITU-R BT.709, the luminance signal of this patent transmission is identical with conventional colour gamut DTV system, and two color difference signal differences.

Encoding equtions that new color difference signal is right and derivation process thereof and feature are as follows:

Light transfer characteristic:

The present invention is making a start, light transfer characteristic shown in the employing formula (1).In the formula, E _R, E _GAnd E _BFor the DTV system by the red, green, blue three primary colors, press the additive color mixture principle, the required tristimulus signals magnitude of voltage of proportioning shades of colour.For with existing conventional colour gamut DTV system compatible, the present invention still adopts ITU-R BT.709 three primary colors coordinate and reference white.For enlarge colour gamut and with the international standard compatibility, the light transfer characteristic that the present invention adopts is the γ correction function of CIE 61966-2-4 standard, comes the non-linear electro-optic transfer characteristic precorrection to display device, the primary colour signal after the correction is the E ' in the formula (1) _R, E ' _GAnd E ' _B

$\left\{\begin{array}{cc}{E}_R^{\&prime;}=-1.099\&times;{(-E_R)}^{0.45}+0.099& E_R\&le;-0.018\\ E_R^{\&prime;}=4.50\&times;E_R& -0.018<E_R<0.018\\ E_R^{\&prime;}=1.099\&times;{\left(E_R\right)}^{0.45}-0.099& E_R\&GreaterEqual;0.018\end{array}\right.$

$\left\{\begin{array}{cc}{E}_G^{\&prime;}=-1.099\&times;{(-E_G)}^{0.45}+0.099& E_G\&le;-0.018\\ E_G^{\&prime;}=4.50\&times;E_G& -0.018<E_G<0.018\\ E_G^{\&prime;}=1.099\&times;{\left(E_G\right)}^{0.45}-0.099& E_G\&GreaterEqual;0.018\end{array}\right.---\left(1\right)$

$\left\{\begin{array}{cc}{E}_B^{\&prime;}=-1.099\&times;{(-E_B)}^{0.45}+0.099& E_B\&le;-0.018\\ E_B^{\&prime;}=4.50\&times;E_B& -0.018<E_B<0.018\\ E_B^{\&prime;}=1.099\&times;{\left(E_B\right)}^{0.45}-0.099& E_B\&GreaterEqual;0.018\end{array}\right.$

It should be noted that the E of conventional colour gamut DTV system transmissions _R, E _GAnd E _BThe signal normalization amplitude range is [0,1], and its γ correction function will not define the negative value primary colour signal.But wide colour gamut DTV need transmit greater than 1 with less than 0 primary colour signal, and the center symmetry γ correction function shown in the formula (1) that the present invention adopts can satisfy this requirement.

Analoging brightness and color difference signal encoding equtions:

Analog luminance signal E ' _YWith two analog color difference signal E ' _CB, E ' _CREncoding equtions as the formula (2).Compare with conventional colour gamut DTV system, the color difference signal that the present invention proposes has added the rotation amount and the translational movement of color space coordinate system, and the two is embodied in matrix A and matrix B in the formula (2) respectively.

$\left[\begin{array}{c}{E}_Y^{\&prime;}\\ E_{\mathrm{CB}}^{\&prime;}\\ E_{\mathrm{CR}}^{\&prime;}\end{array}\right]=A\&times;\left[\begin{array}{c}{E}_R^{\&prime;}\\ E_G^{\&prime;}\\ E_B^{\&prime;}\end{array}\right]+B=\left[\begin{array}{ccc}0.2126& 0.7152& 0.0722\\ -0.5196& 0.2635& 0.2561\\ 0.0536& -0.5920& 0.5384\end{array}\right]\&times;\left[\begin{array}{c}{E}_R^{\&prime;}\\ E_G^{\&prime;}\\ E_B^{\&prime;}\end{array}\right]+\left[\begin{array}{c}0\\ -0.0451\\ 0.0751\end{array}\right]---\left(2\right)$

By formula (2), guarantee whole transmission of Pointer colour gamut, E ' _Y, E ' _CBAnd E ' _CRThe codomain scope be respectively 0～1 ,-0.5～+ 0.5 and-0.5～+ 0.5, they can be in the transmission of conventional colour gamut DTV system compatible.

Digital brightness and color difference signal encoding equtions:

For transmitting with conventional colour gamut DTV system compatible, the present invention still adopts 8 bit quantization precision, but because of introducing color space rotation of coordinate and translation, and make the digital coding equation (3) of two color difference signals different with conventional colour gamut.In the formula, D ' _YShown in luminance signal digital coding equation consistent with conventional colour gamut, but D ' _CBAnd D ' _CRShown in two color difference signal digital coding equations be different from conventional colour gamut, be reflected as direct current (DC) side-play amount 139 and 112 in the formula (3).

D′ _Y(8)＝INT[(219×E′ _Y+16)]

D′ _CB(8)＝INT[(224×E′ _CB+139)] (3)

D′ _CR(8)＝INT[(224×E′ _CB+112)]

By formula (3), to 8 bit quantizations, D ' _Y, D ' _CBAnd D ' _CRCodomain be respectively 16～235,16～240 and 16～240, identical with conventional colour gamut, be able to compatible transmission.

Be the wide color gamut images of representation, terminal need be carried out the signal decoding process opposite with above-mentioned processing, shown in (4)～(6).

Digital brightness and color difference signal decoding equation:

Terminal equipment receives and processing procedure through a series of signal, recovers digital brightness and color difference signal D ' _YAnd D ' _CB, D ' _CRSignal then carries out inverse quantization, rebuilds analoging brightness and two color difference signal E ' _YAnd E ' _CB, E ' _CRFormula (4) is a terminal inverse quantization equation, i.e. the anti-processing of formula (3).

E′ _Y＝(D′ _Y-16)/219

E′ _CB＝(D′ _CB-139)/224 (4)

E′ _CR＝(D′ _CR-112)/224

Analoging brightness and color difference signal decoding equation:

By formula (5) decoding analoging brightness and color difference signal E ' _YAnd E ' _CB, E ' _CR, recover simulation tristimulus signals E ' _R, E ' _GAnd E ' _BDecoding matrix (5) is the inverse matrix of encoder matrix (2).

$\left[\begin{array}{c}{E}_R^{\&prime;}\\ E_G^{\&prime;}\\ E_B^{\&prime;}\end{array}\right]=\left[\begin{array}{ccc}1& -1.4577& 0.5593\\ 1& 0.3768& -0.3134\\ 1& 0.5595& 1.4571\end{array}\right]\&times;\left[\begin{array}{c}{E}_Y^{\&prime;}\\ E_{\mathrm{CB}}^{\&prime;}+0.04512\\ E_{\mathrm{CR}}^{\&prime;}-0.0751\end{array}\right]---\left(5\right)$

The display primary signal:

Rebuild display primary signal E by formula (6) _R, E _G, E _BFormula (6) is the anti-γ correction function of formula (1).

$\left\{\begin{array}{cc}{E}_R=-\left[{\left(\frac{E_R^{\&prime;}-0.099}{-1.099}\right)}^{\frac{1}{0.45}}\right]& E_R^{\&prime;}\&le;-0.081\\ E_R=\frac{E_R^{\&prime;}}{4.5}& -0.081<E_R^{\&prime;}<0.081\\ E_R={\left(\frac{E_R^{\&prime;}+0.099}{1.099}\right)}^{\frac{1}{0.45}}& E_R^{\&prime;}\&GreaterEqual;0.081\end{array}\right.$

$\left\{\begin{array}{cc}{E}_G=-\left[{\left(\frac{E_G^{\&prime;}-0.099}{-1.099}\right)}^{\frac{1}{0.45}}\right]& E_G^{\&prime;}\&le;-0.081\\ E_G=\frac{E_G^{\&prime;}}{4.5}& -0.081<E_G^{\&prime;}<0.081\\ E_G={\left(\frac{E_G^{\&prime;}+0.099}{1.099}\right)}^{\frac{1}{0.45}}& E_G^{\&prime;}\&GreaterEqual;0.081\end{array}\right.---\left(6\right)$

$\left\{\begin{array}{cc}{E}_B=-\left[{\left(\frac{E_B^{\&prime;}-0.099}{-1.099}\right)}^{\frac{1}{0.45}}\right]& E_B^{\&prime;}\&le;-0.081\\ E_B=\frac{E_B^{\&prime;}}{4.5}& -0.081<E_B^{\&prime;}<0.081\\ E_B={\left(\frac{E_B^{\&prime;}+0.099}{1.099}\right)}^{\frac{1}{0.45}}& E_B^{\&prime;}\&GreaterEqual;0.081\end{array}\right.$

Making a start,, the normalization primary colour signal is being carried out γ proofread and correct, encode and quantize, obtaining the wide colour gamut DTV signal of compatible transmission successively by formula (1), (2), (3);

In receiving end, successively by formula (4), (5), (6), wide colour gamut DTV signal inverse quantization, decoding and the anti-γ that receives proofreaied and correct, rebuild wide colour gamut primary colours drive signal, the wide colour gamut of representation, high quality graphic or video on screen.

Claims (2)

1. the compatible transmission method of a wide-gamut digital TV signals is characterized in that, carries out following signal processing step making a start:

Opto-electronic conversion:

Making a start, still adopt ITU-R BT.709 three primary colors and reference white, and for enlarge colour gamut and with the international standard compatibility, three groups of center symmetry γ correction functions identical below light transfer characteristic adopts with CIE 61966-2-4 recommendation, come the non-linear electro-optic transfer characteristic of display device is carried out precorrection, in the formula, E _R, E _GAnd E _BFor digital television system by the red, green and blue three primary colors, press the additive color mixture principle, the required tristimulus signals magnitude of voltage of proportioning shades of colour; E ' _R, E ' _GAnd E ' _BBe the tristimulus signals magnitude of voltage after proofreading and correct,

Analog luminance signal and analog color difference signal encoding:

Analog luminance signal E ' _YWith two analog color difference signal E ' _CB, E ' _CREncoding equtions be shown below, the rotation amount and the translational movement of the color space coordinate system that color difference signal is additional are embodied in matrix A and matrix B in the formula respectively:

Press following formula, can guarantee whole transmission of Pointer colour gamut, E ' _Y, E ' _CBAnd E ' _CRThe codomain scope be respectively 0～1 ,-0.5～+ 0.5 and-0.5～+ 0.5, they can be in the transmission of conventional colour gamut DTV system compatible;

Digital luminance signal and digital difference signal coding:

For transmitting with conventional colour gamut DTV system compatible, still adopt 8 bit quantization precision, digital luminance signal and two digital difference signal encoding equtionss are shown below D ' _{Y (8)}Shown in luminance signal digital coding equation consistent with conventional colour gamut; But D ' _{CB (8)}And D ' _{CR (8)}Shown in two color difference signal digital coding equations be different from conventional colour gamut, be reflected as the dc offset 139 and 112 in the formula:

D′ _Y(8)＝INT[(219×E′ _Y+16)]

D′ _CB(8)＝INT[(224×E′ _CB+139)]

D′ _CR(8)＝INT[(224×E′ _CB+112)]

Successively by light transfer characteristic, analoging brightness and color difference signal encoding equtions, digital brightness and color difference signal encoding equtions, proofread and correct, encode and quantize carry out γ by the normalized primary colour signal of reference white signal amplitude, obtain wide-gamut digital TV signals with conventional colour gamut DTV system compatible transmission.

2. the compatible transmission method of a kind of wide-gamut digital TV signals according to claim 1 is characterized in that, comprises following signal processing step:

Digital luminance signal and digital difference signal decoding:

Terminal equipment adopts digital luminance signal shown in the following formula and digital difference signal decoding equation, to digital luminance signal and two digital difference signal D ' _YAnd D ' _CB, D ' _CRCarry out inverse quantization, luminance signal and two analog color difference signal E ' are intended in the modeling of laying equal stress on _YAnd E ' _CB, E ' _CR:

E′ _Y＝(D′ _Y-16)/219

E′ _CB＝(D′ _CB-139)/224

E′ _CR＝(D′ _CR-112)/224

Analog luminance signal and analog color difference signal decoding:

Press analog luminance signal shown in the following formula and analog color difference signal decoding equation, decoding analog luminance signal and two analog color difference signal E ' _YAnd E ' _CB, E ' _CR, recover simulation tristimulus signals E ' _R, E ' _GAnd E ' _B:

The electric light conversion:

By following three groups of anti-γ correction functions, rebuild display primary signal E respectively _R, E _GAnd E _B:

Press the decoding of digital luminance signal and digital difference signal equation, analog luminance signal and analog color difference signal decoding equation and anti-γ correction function successively, the wide colour gamut DTV signal that receives is carried out the wide colour gamut primary colours of inverse quantization, decoding and reconstruction drive signal respectively, the wide colour gamut of representation, high quality graphic or video image on screen.