i've divided the image into overlapping blocks. can anybody tell me the methods for comparing the similarity of two image blocks?
intensity mean and glcm mean i know. except these two what other methods are that i can use?
There are literally thousands upon thousands of things you can measure about an image. No one can list them all. You have to say what you're looking for and measure only those things, and not waste time measuring the thousands of other things that you could possibly measure. For example, you could measure SSIM (<http://en.wikipedia.org/wiki/SSIM)>, PSNR, area fraction, length of your widgets, concentration of fluorescent dye, amount of radioactivity, number of people, speed of cars, equivalent circular diameters, morphometrics, volume of logs on the timber truck, quantity of heat emanating from the building, or countless other things.