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ok, you found a bug, those constants were not properly mapped to the c++ interface (thus ignored by the python wrapper)

actually it's just a simple enum (imgproc/types_c.h):

/* Shape matching methods */
enum
{
    CV_CONTOURS_MATCH_I1  =1,
    CV_CONTOURS_MATCH_I2  =2,
    CV_CONTOURS_MATCH_I3  =3
};

so, use the numerical values for now (1 in your case).

ok, looks like you found a bug, those constants were not properly mapped to the c++ interface (thus ignored by the python wrapper)

actually it's just a simple enum (imgproc/types_c.h):

/* Shape matching methods */
enum
{
    CV_CONTOURS_MATCH_I1  =1,
    CV_CONTOURS_MATCH_I2  =2,
    CV_CONTOURS_MATCH_I3  =3
};

so, use the numerical values for now (1 in your case).