Correlation coefficient for image pixels

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sa za 2013-6-21

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https://ww2.mathworks.cn/matlabcentral/answers/79880-correlation-coefficient-for-image-pixels

I want to calculate the correlation coefficient for my image pixel(binary)and after that for my encrypted image. I know corr2 is for calculating the correlation coefficient for two images.

But is there a function for calculating the correlation coefficient for one image in matlab?Actually I want a number not a matrix

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回答（2 个）

Nitin 2013-6-22

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https://ww2.mathworks.cn/matlabcentral/answers/79880-correlation-coefficient-for-image-pixels#answer_89606

Hello, I am pretty sure corr2 returns a value , http://www.mathworks.com.au/help/images/ref/corr2.html

You need to compare with something to get a correlation coefficient, either with other images or other parts of your image

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sa za 2013-6-25

hi.yes.correlation should be about 0.but how can I get this correlation ?

Image Analyst 2013-6-25

I thought you were using corr2(). What's wrong with that?

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sa za 2013-6-27

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https://ww2.mathworks.cn/matlabcentral/answers/79880-correlation-coefficient-for-image-pixels#answer_90171

I can not use corr2 because corr2 working for two image but I want to get correlation coefficient for one image could I divide my image in 2 parts and then use corr2?