matlab公共函數之RGB與YUV轉換

matlab中有自帶的rgb轉ycbcr函數，但是根據觀測，其Y的值為[16 235]，不符合我們的要求，所以，提供另一種規范下的轉換腳本函數，其Y的值滿足[0 255]

RGB轉YUV

% function yuv = myrgb2yuv(image)
% input params.
% image: input color image with 3 channels, which value must be [0 255]
% output 
% yuv: 3 channels(YUV444, Y plane, U plane, V plane), value [0 255], double
%
%
% Author: KevenLee 
% Contact: [e-mail]
% Version: V1.0

function yuv = myrgb2yuv(image)
image = double(image);
R = image(:,:,1);
G = image(:,:,2);
B = image(:,:,3);

yuv(:,:,1) = 0.299.*R + 0.587.*G + 0.114.*B;
yuv(:,:,2) = - 0.1687.*R - 0.3313.*G + 0.5.*B + 128;
yuv(:,:,3) = 0.5.*R - 0.4187.*G - 0.0813.*B + 128;
end

 YUV轉RGB

% function rgb  = myyuv2rgb(image)
% input params.
% image: input YUV image with YUV444 format, which value must be [0 255]
% output 
% rgb: 3 channels color image, value [0 255], double
%
%
% Author: KevenLee 
% Contact: [e-mail]
% Version: V1.0

function rgb  = myyuv2rgb(image)
image = double(image);
Y = image(:,:,1);
U = image(:,:,2);
V = image(:,:,3);

R = Y + 1.402.*(V-128);

G = Y - 0.34414.*(U-128) - 0.71414.*(V-128);

B = Y + 1.772.*(U-128);

rgb(:,:,1) = R;
rgb(:,:,2) = G;
rgb(:,:,3) = B;
end