How to compute three values of PSNR one for each channel, using RGB image?

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Aniket Paranjpe 2017-12-19

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https://ww2.mathworks.cn/matlabcentral/answers/373715-how-to-compute-three-values-of-psnr-one-for-each-channel-using-rgb-image

评论： Aniket Paranjpe 2018-1-11

采纳的回答： Image Analyst

I want to compute PSNR of a watermarked RGB image and original RGB Image. Please help it's for my project.

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Image Analyst 2017-12-19

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https://ww2.mathworks.cn/matlabcentral/answers/373715-how-to-compute-three-values-of-psnr-one-for-each-channel-using-rgb-image#answer_296991

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Split the image up into different color channels and use psnr() on each channel:

% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);
greenChannel = rgbImage(:, :, 2);
blueChannel = rgbImage(:, :, 3);
% Extract also for watermarked image, then compute PSNR:
psnrRed = pnr(redChannel, redChannelWatermarked);
psnrGreen = pnr(greenChannel , greenChannelWatermarked);
psnrBlue = pnr(blueChannel , blueChannelWatermarked);