how can i write psnr coding for denoised image

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.

Answer 1

[chitresh]

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);

Answer 2

[dian_pratama]

You can use this code:

%========= PSNR ============

H = vision.PSNR;

psnr = step(H, denoised_img, original_img);

psnr

Answer 3

[Image Analyst]

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.