Decompress.m

% Image decompression funtion
function reco_image = Decompress(comp_image)

% Initialization
% 找到四张不同图像所在的位置，并且分离出来
for i=1:4
    clear temp_image
    
    pos = find(comp_image == 10002);
    switch i
        case 1
            temp_image = comp_image(1: pos(1));
        otherwise
            temp_image = comp_image(pos(i-1)+1:pos(i));
    end
   
    
    pos = find(temp_image == 10001);
    
    % 将Y、U、V分别出来
    comp_image_Y = temp_image(1:pos(1));
    comp_image_U = temp_image(pos(1)+1:pos(2));
    comp_image_V = temp_image(pos(2)+1:pos(3));
    
    % 调用解压缩函数
    orig_image_Y = jpg2img(comp_image_Y);
    orig_image_U =  jpg2img(comp_image_U);
    orig_image_V =  jpg2img(comp_image_V);
    
    % 还原成RGB图像
    RI=orig_image_Y-0.001*orig_image_U+1.402*orig_image_V;
    GI=orig_image_Y-0.344*orig_image_U-0.714*orig_image_V;
    BI=orig_image_Y+1.772*orig_image_U+0.001*orig_image_V;
    
    RGBI=cat(3,RI,GI,BI);
    RGBI=uint8(RGBI);
    
    save_image(:,:,:,i) = double(RGBI);
end
reco_image = save_image;