MATLAB— RGB图像 ==>Bayer图像 （bggr, gbrg, grbg, rggb)

MATLAB— RGB图像 ==> Bayer图像 （bggr, gbrg, grbg,  rggb)

通过 MATLAB 将 RGB图像 转换成 Bayer图像（四种Bayer pattern：BGGR，GBRG，GRBG，RGGB）

clc;clear;close all

I = imread('lena.jpg');
I_bayer = make_bayer(I,'bggr');
figure;imshow(I_bayer);title('Bayer image');

function [Ibayer] = make_bayer(Irgb,F)  % 根据输入的Bayer格式选择相应的函数  
if strcmp(F,'bggr')    
    Ibayer = BGGR(Irgb);
elseif strcmp(F,'gbrg') 
    Ibayer = GBRG(Irgb);
elseif strcmp(F,'grbg')
    Ibayer =GRBG(Irgb);
else strcmp(F,'rggb')
    Ibayer = RGGB(Irgb);
end

function[Ibayer] = BGGR(Irgb)

Irgb = double(Irgb)/255;

Ibayer = zero(size(Irgb,1),size(Irgb,2));

Ibayer(1:2:end,1:2:end) = Irgb(1:2:end,1:2:end,3); % copy blue(B)

Ibayer(1:2:end,2:2:end) = Irgb(1:2:end,2:2:end,2); % copy green(G)

Ibayer(2:2:end,1:2:end) = Irgb(2:2:end,1:2:end,2); % copy green(G)

Ibayer(2:2:end,2:2:end) = Irgb(2:2:end,2:2:end,1); % copy red(R)
return
end

function[Ibayer] = GBRG(Irgb)

Irgb = double(Irgb)/255;

Ibayer = zero(size(Irgb,1),size(Irgb,2));

Ibayer(1:2:end,1:2:end) = Irgb(1:2:end,1:2:end,2); % copy green(G)

Ibayer(1:2:end,2:2:end) = Irgb(1:2:end,2:2:end,3); % copy blue(B)

Ibayer(2:2:end,1:2:end) = Irgb(2:2:end,1:2:end,1); % copy red(R)

Ibayer(2:2:end,2:2:end) = Irgb(2:2:end,2:2:end,2); % copy green(G)
return
end

function[Ibayer] = GRBG(Irgb)

Irgb = double(Irgb)/255;

Ibayer = zero(size(Irgb,1),size(Irgb,2));

Ibayer(1:2:end,1:2:end) = Irgb(1:2:end,1:2:end,2); % copy green(G)

Ibayer(1:2:end,2:2:end) = Irgb(1:2:end,2:2:end,1); % copy red(R)

Ibayer(2:2:end,1:2:end) = Irgb(2:2:end,1:2:end,3); % copy blue(B)

Ibayer(2:2:end,2:2:end) = Irgb(2:2:end,2:2:end,2); % copy green(G)
return
end

function[Ibayer] = RGGB(Irgb)

Irgb = double(Irgb)/255;

Ibayer = zero(size(Irgb,1),size(Irgb,2));

Ibayer(1:2:end,1:2:end) = Irgb(1:2:end,1:2:end,1); % copy red(R)

Ibayer(1:2:end,2:2:end) = Irgb(1:2:end,2:2:end,2); % copy green(G)

Ibayer(2:2:end,1:2:end) = Irgb(2:2:end,1:2:end,2); % copy green(G)

Ibayer(2:2:end,2:2:end) = Irgb(2:2:end,2:2:end,3); % copy blue(B)
return
end