Shape Distance Logic

opencv

asked 2016-07-24 07:19:27 -0600

accqq
1

I would like to ask the logic behind the shape distance provided in opencv 3.1 as I am confused by the results of using shape distance when comparing duplicated images.

I used the shape distance example as the starting point and tested the shape distance between copied bmp images (I just duplicated the bmp file of the sample image). The shape distance calculated is not stable and not equal to zero which makes me confused of the meaning of the magnitude of the calculated shape distance.

Therefore, I would like to ask for the logic behind the shape distance calculation. Thanks!

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answered 2016-07-24 08:59:49 -0600

Tetragramm

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Depending on which method you're using, it's either in HERE, the shape module, or HERE if you're using cv::matchShapes.

matchShapes is pretty simple, the others not so much.

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Thanks a lot! I was using " cv::Ptr <cv::shapecontextdistanceextractor> mysc = cv::createShapeContextDistanceExtractor(); " to calculate the shape distance between the sample picture and the testing picture. Does it belong to the first one?