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I have some kinds of paper sheet and I am writing python script with opencv to recognize the same paper sheet to classify. I am stuck in how to find the same kind of paper sheet. For example, I attached two pic. Picture 1 is the template and picture 2 is some kind of paper I need to know if it is matching with the template. I don't need to match the text and I just need to match the form. I need to classify the same sheet in many of paper sheet.

I have adjust the skew of paper and detect some lines but I don't know how to match the lines and judge this paper sheet is the same kind with the template.

Is there any one can give me an advice for the matching algorithm?