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Entropy and Correlation -Image analysis

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Nil
Nil 2012-3-29
Hi I implemented data hiding in image and now i want to determine the extent to which the original image and the stego-image are close to each other
PSNR and MSE parameters can be used for the same which I have implemented for looking for matlab code on following performance measurement parameters
Entropy
Correlation = RXY (α,β )= ∑i ∑j X(i,y) Y(i-α ,j- β)
I am using grayscale image for implementation. Any help appreciated
For Entropy, is following code correct?
I=imread(" orginal image name")
J=Entropy(I)
K=imread(" Stego image name")
M=Entropy(K)
In Ideal case diffrence between J &M should be zero

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