Error Concealment | JPEG | MPEG-4 | Wavelet | YUV

how can i measure the spatial correlation in any image? suppose, there are two images I1 and I2. is there any method that will quantitatively tell me which of those two is more/less spatially correlated?

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Hi whoever,
  For comapring the similarity you can use the cross correlation coefficient . That basically
tells you how much is the 2 images same .
The formula is 
r = (Sum(x(i) -
Mean(x))*Sum(y(i)-Mean(y))/(SQRT(Sum(SQUARE((x(i)-Mean(x))*SQRT(Sum(SQUARE((y(i)-Mean(y)));
where x and y are the 2 images . If the images are same then the correlation coefficient would
be very high .else it would be close to zero.

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