RGB and (Conversion from RGB to YCbCr to RGB) images

RGB and (converted from RGB to YCbCr to RGB) are irreversible, which can be seen from the inverse operation of the matrix. Attached Matlab code:

Clc,clear1_source1_imread('1.jpg '); % read original RGB image figure (1); subplot (1, 2, 1); imshow (source): Title ('original '); % Show image [r c d] = size (source); % calculate image size % ------ calculate the red component and display the decomposition diagram ------ % R (:,:, 1) = source (:,:, 1); R (:,:, 2) = zeros (R, c); R (:,:, 3) = zeros (r, c); r = uint8 (r); whos; figure (2); subplot (1, 1); imshow (r) Title ('red component '); % ------- calculate the green component and display the decomposition graph ------- % G (:,:, 2) = source (:,:, 2); G (:,:, 1) = zeros (R, c); G (:,:, 3) = zeros (R, c); G = uint8 (g); figure (2); subplot (1, 3, 2); imshow (g) Title ('green component'); % -------- calculate the blue component and display the decomposition graph ------- % B (:,:, 3) = source (:, :, 3); B (:,:, 1) = zeros (R, c); B (:,:, 2) = zeros (R, C ); B = uint8 (B); figure (2); subplot (, 3) imshow (B) Title ('Blue component'); % ------------ synthesize ------------- % comp (:, :, 1) = R (:,:, 1); comp (:,:, 2) = g (:,:, 2); comp (:,:, 3) = B (:,:, 3); figure (5); subplot (1, 2); imshow (COMP): Title ('composition image '); y = 0.213 * r + 0.715 * g + 0.072 * B; Cb = 0.511 * B-0.117 * R-0.394 * g + 128; CR = 0.511 * R-0.464 * G-0.047 * B + 128; % red = Y + 1.402 * (Cr-128); % Green = Y-0.34414 * (CB-128)-0.71414*(Cr-128 ); % Blue = Y + 1.772 * (CB-128); Red = 1.164 * (Y-16) + 1.793 * (Cr-128); Green = 1.164*(Y-16)-0.534 * (Cr-128) -0.213 * (CB-128); Blue = 1.164 * (Y-16) + 2.115 * (CB-128); comp2 (:,:, 1) = red (:,:, 1); comp2 (:,:, 2) = green (:,:, 2); comp2 (:,:, 3) = blue (:,:, 3 ); comp5 (:,:, 1) = y (:,:, 1); comp5 (:,:, 2) = CB (:,:, 2); comp5 (:, :, 3) = CR (:,:, 3); figure (5); imshow (comp5); Title ('show 11ycbcr '); figure (1 ); subplot (, 2); imshow (comp2); Title ('rgb converted to ycrcb and then converted to RGB image'); RD = R (:,:, 1) -Red (:,:, 1); GD = g (:,:, 2)-green (:,:, 2); BD = B (:,:, 3) -Blue (:,:, 3); figure (4); subplot (, 1); imshow (RD); Title ('red component exception'); subplot, 2); imshow (GD); Title ('difference of green weight'); subplot (, 3); imshow (BD); Title ('difference of blue weight ');

RGB and (Conversion from RGB to YCbCr to RGB) images