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hi zulfiqar ,

it probably works if you change the type of histogram from vector<Mat> to Mat and the type of hist_bast to plain Mat, too. (that worked for in 3.0)

kmeans tries to resolve the inputArray as a Mat, and that fails, if you pass a vector<Mat>.

that's probably a bug. _InputArray::getMat(int i=-1) code tries to index the vector<Mat>, there the assertion.

hi zulfiqar ,

it probably works if you change the type of histogram from vector<Mat> to Mat and the type of hist_bast to plain Mat, too. (that worked for in 3.0)

kmeans tries to resolve the inputArray as a Mat, and that fails, if you pass a vector<Mat>.

that's probably a bug. _InputArray::getMat(int i=-1) code tries to index the vector<Mat>, there the assertion.

    // hue varies from 0 to 180, saturation from  0 to 256
    float h_ranges[] = { 0, 180 };
    float s_ranges[] = { 0, 256 };