How to find correaltion coeffient for two image regions?

2014 2 27
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更新时间：2014 2 27
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I have 2 5-by-5 image regions. I want to find out correlation coefficient between them. Formula is- Denote the pixel intensity at location x as I(x),and W(x) as the 5-by-5 neighboring area centered at x, the correlation coefficient between the two pixel locations is computed as:

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