Correlation coefficient for image pixels

2013 6 21
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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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Nitin
Nitin 2013-6-22

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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
sa za 2013-6-22
编辑：sa za 2013-6-22
Hi.corr2 returns a value but between two image but for one image what should i do?i know i should choose random pixels from my image and calculating the correlation coefficient between them but how? may be i should split the image into two parts and used for corr2 parameters?
Image Analyst
Image Analyst 2013-6-23
If it's encrypted, wouldn't the correlation be about 0? If not, it's not encrypted very well.
sa za
sa za 2013-6-25
hi.yes.correlation should be about 0.but how can I get this correlation ?
Image Analyst
Image Analyst 2013-6-25
I thought you were using corr2(). What's wrong with that?

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sa za
sa za 2013-6-27

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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?

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sa za
sa za
2013-6-21

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