YDbDr color model

The YDbDr color model is only used in analog color television in accordance with the SECAM standard , for which it was developed.

YDbDr uses three components to represent image information : the luminance Y ( light intensity per area, luma ) and two chrominance components (color components) D _b and D _r . It belongs to the group of brightness-chromaticity-color models .

The following is defined for the formation of the components Y , D _b and D _r from the RGB color space :

${\displaystyle Y=+0{,}299\cdot R+0{,}587\cdot G+0{,}114\cdot B}$

${\displaystyle D_{b}=+1{,}505\cdot (B-Y)=-0{,}450\cdot R-0{,}883\cdot G+1{,}333\cdot B}$

${\displaystyle D_{r}=-1{,}902\cdot (R-Y)=-1{,}333\cdot R+1{,}116\cdot G+0{,}217\cdot B}$

The analog YDbDr color model differs from the closely related analog YUV color model only in terms of other scaling (attenuation or amplification) factors for the two color signals. The brightness signal Y, on the other hand, is generated identically as in the YUV color model. The conversion factors between the signals U and D _b or V and D _r can be determined by comparing the coefficients :

${\displaystyle D_{b}=+3{,}059\cdot U}$

${\displaystyle D_{r}=-2{,}169\cdot V}$

Individual evidence

1. ↑ World Analogue Television Standards and Waveforms - Color Standards ( Memento of the original from February 21, 2014 in the Internet Archive ) Info: The archive link has been inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.