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I want to measure entropy and PSNR to N number of images

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Abdullah
Abdullah on 23 Apr 2017
Edited: Image Analyst on 23 Apr 2017
clc
clear all
srcFiles = dir('----\*.jpg'); % the folder in which ur images exists
for i = 1 : length(srcFiles)
filename = strcat('----',srcFiles(i).name);
I = imread(filename);
end
E = entropy(I);
It returns to me one value only.

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Accepted Answer

Image Analyst
Image Analyst on 23 Apr 2017
Edited: Image Analyst on 23 Apr 2017
Yes that's true. You're only calling it on the very last image you read in. If you want a value for every image, put it in the loop and index it.
for i = 1 : length(srcFiles)
filename = strcat('----',srcFiles(i).name);
I = imread(filename);
E(i) = entropy(I);
end
If you want a value for every pixel in the image, use entropyfilt() instead of entropy().
entropyImage{i} = entropyfilt(I);
You can compute PSNR with the Image Processing Toolbox function called psnr().

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