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I would like to find a similarity measure between two images showing characters taking into account their histograms. An image example may contain just an individual letter or it could contain several characters and look like this:

.

Can anyone please guide me through how to use calcHist function in order to feed its output to compareHist function and find a similarity measure between such images. The important point is that the characters may not look the same and may be a little bit distorted while they still remain similar.

If this approach is not correct, do you know any other approaches? I played with matchShapes but because it is rotation invariant, it sometimes does not provide satisfactory results and letter p is then similar to letter d.

I would like to find a similarity measure between two images showing characters taking into account their histograms. An image example may contain just an individual letter or it could contain several characters and look like this:

.

Can anyone please guide me through how to use calcHist function in order to feed its output to compareHist function and find a similarity measure between such images. The important point is that the characters may not look the same and may be a little bit distorted while they still remain similar.

If this approach is not correct, do you know any other approaches? I played with tried out outer approaches such as matchShapes but because it is they are quite often rotation invariant, it they sometimes does do not provide satisfactory results and letter p is then similar to letter d.