TM_CCOEFF_NORMED for images with the same size

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Hi There!

I am using template matching with option TM_CCOEFF_NORMED to measure similarity between two image patches of the same size. It works nice however I cannot understand what it is actually doing, can someone explain to me the equation at http://docs.opencv.org/3.0.0/df/dfb/g... please?

What T' and T(x'',y'') mean? Since my template T and Image I have the same size, would it be possible to make this notation simpler?

Many Thanks, P

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answered Mar 24 '16

Tetragramm

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What the T' and I' are is the template and image minus the mean in the area of the template. Since they are the same size, for both images, it's simply the subtraction of the mean. IE template - mean(template) and image - mean(image).

Then x and y are zero, so only the x' and y' matter in the other part of the equation. That would be the offset to the portion of the image you are matching, and in this case, the whole image is that portion.

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Asked: Mar 24 '16

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TM_CCOEFF_NORMED for images with the same size edit savecancel

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TM_CCOEFF_NORMED for images with the same size