rgb到matlab中的ycbcr转换

Question

我正在尝试在Matlab中编写一个函数,该函数采用类unit8的RGB图像并将其转换为YCBCR图像.转换公式如下.

我会非常感谢任何帮助.

Answer 1

如果您可以访问它,则有一个图像处理工具箱功能:RGB2YCBCR

如果您无权访问它,请按照以下方式进行转换:

rgbImage = imread('peppers.png');  %# A sample RGB image
A = [65.481 -37.797 112; ...       %# A 3-by-3 matrix of scale factors
     128.553 -74.203 -93.786; ...
     24.966 112 -18.214];

%# First convert the RGB image to double precision, scale its values to the
%#   range 0 to 1, reshape it to an N-by-3 matrix, and multiply by A:
ycbcrImage = reshape(double(rgbImage)./255,[],3)*A;

%# Shift each color plane (stored in each column of the N-by-3 matrix):
ycbcrImage(:,1) = ycbcrImage(:,1)+16;
ycbcrImage(:,2) = ycbcrImage(:,2)+128;
ycbcrImage(:,3) = ycbcrImage(:,3)+128;

%# Convert back to type uint8 and reshape to its original size:
ycbcrImage = reshape(uint8(ycbcrImage),size(rgbImage));

这是您显示时获得的图像ycbcrImage: