How I can compare one pixel to a neighbor pixel and also another pixel?

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Also, how I can make a difference histogram of the comparison results? Or how I can make a difference histogram generally?

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Image Analyst
Image Analyst 2013-1-14
How do you want to compare them? Do you want to subtract them? If so you can use conv2(). Do you want to know how many times one gray level occurs next to another gray level? If so you can use graycomatrix().
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