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Hi, One option may be to use the laplacian option in Canny Canny( InputArray image, OutputArray edges, double threshold1, double threshold2, int apertureSize=3, bool L2gradient=false ); make the L2gradient=true and check the result out.
If possible try to check if the Matlab canny detector gives the same result. As suggested by Daniil Osokin you could use find contours as an alternate if you have only Binary images.
Thanks Venky