How to use built-in entropy function

2 visualizzazioni (ultimi 30 giorni)
Mustafa Uysal
Mustafa Uysal il 24 Dic 2019
Commentato: Mustafa Uysal il 3 Feb 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 Commenti
Image Analyst
Image Analyst il 24 Dic 2019
Make sure there are no zeros in your image.
Mustafa Uysal
Mustafa Uysal il 24 Dic 2019
But it can be zero in any image. Why it is a problem?

Accedi per commentare.

Accedi per rispondere a questa domanda.

Risposta accettata

Subhadeep Koley
Subhadeep Koley il 1 Feb 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)))

Più risposte (0)

Categorie

Scopri di più su Image Processing Toolbox in Help Center e File Exchange

Tag

Prodotti

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by