how can i write psnr coding for denoised image

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harini nagarajan
harini nagarajan 2014-2-19
回答： Image Analyst 2015-3-4
i need to find the matlab coding psnr value for the denoised image by comparing it with the original image only not with the text.

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回答（3 个）

chitresh
chitresh 2014-2-19
conver input image and noise image to gray scale image by using rgb2gray(image)
[rows columns] = size(input_gray_image);
squared_error_image = (double(input_gray_image)-double(noise_gray_image)).^2;
mse = sum(sum(squared_error_image))/(rows*columns);
psnr = 10*log10(255^2/mse);
dian_pratama
dian_pratama 2015-3-4
You can use this code:
%========= PSNR ============
H = vision.PSNR;
psnr = step(H, denoised_img, original_img);
psnr
Image Analyst
Image Analyst 2015-3-4
Use the psnr function in the Image Processing Toolbox
thePsnr = psnr(image1, image2);
Or see my attached function if you don't have that toolbox.

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