How to use built-in entropy function

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Mustafa Uysal 2019-12-24

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https://ww2.mathworks.cn/matlabcentral/answers/497946-how-to-use-built-in-entropy-function

评论： Mustafa Uysal 2020-2-3

采纳的回答： Subhadeep Koley

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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

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Image Analyst 2019-12-24

Make sure there are no zeros in your image.

Mustafa Uysal 2019-12-24

But it can be zero in any image. Why it is a problem?

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采纳的回答

Subhadeep Koley 2020-2-1

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https://ww2.mathworks.cn/matlabcentral/answers/497946-how-to-use-built-in-entropy-function#answer_413225

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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)))

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Mustafa Uysal 2020-2-3

I tried and it worked

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