I have an image which has been encrypted, and then hidden in a cover image. and finally retrieved. I'd like to find the horiz, vertical and diagonal correlation coeff's of the initial image, and the cipher image. What's the matlab command for this?

Direction of Adjacent pixels Plain Image Cipher Image

Horizontal 0.9791 0.0052 Vertical 0.9357 0.0539 Diagonal 0.9183 0.1141

Yes they are numbers. The correlation coeeficient, which is a number, which gives me the correlation between any two adjacent pixels, in the horiz, vertical or diagonal direction.

Basically this is what I mean:For statistical analysis of an encrypted image: This is shown by a test of the correlation between two adjacent pixels in plain image and encrypted image. We randomly select 2000 pairs of two-adjacent pixels (in vertical, horizontal, and diagonal direction) each from plain images and ciphered images, and calculate the correlation coefficients, respectively by the following: corr coeff=covariance(x,y)/variance(x)^0.5*variance(y)^0.5

where x and y are the grey scale values of the two neighboring pixels. And each of these is summed over all the pixels in the image

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