How to use built-in entropy function

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Mustafa Uysal
Mustafa Uysal le 24 Déc 2019
Commenté : Mustafa Uysal le 3 Fév 2020
Hi,
i would like to calculate entropy of an image using entropy function. when use this function like this
E = entropy(uint8(output_image)
i can see a value. But when i remove uint8, i see 0 as a result. type of output_image is double. Also when i try to calculate entropy like described in this link
E = -sum(histogram_of_output_image.*log2(histogram_of_output_image));
i see NAN (not a number) as a result
  2 commentaires
Image Analyst
Image Analyst le 24 Déc 2019
Make sure there are no zeros in your image.
Mustafa Uysal
Mustafa Uysal le 24 Déc 2019
But it can be zero in any image. Why it is a problem?

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Subhadeep Koley
Subhadeep Koley le 1 Fév 2020
Hi, Can you attach your "output_image" ? So that we can reproduce the issue.
Otherwise you can try the code below.
E = entropy(uint8(rescale(output_image, 0, 255)))
  1 commentaire
Mustafa Uysal
Mustafa Uysal le 3 Fév 2020
I tried and it worked

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