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for the reference, here's what i came up with:

Mat img(8,8,CV_8U); randu(img,0,255); Mat hist;

calcHist(vector<mat>{img}, vector<int>{0}, Mat(), hist, vector<int>{16}, vector<float>{0,255});

for the reference, here's what i came up with:

Mat img(8,8,CV_8U);
randu(img,0,255);
Mat hist;
hist;
  
calcHist(vector<mat>{img}, calcHist(vector<Mat>{img}, vector<int>{0}, Mat(), hist, vector<int>{16}, vector<float>{0,255});vector<float>{0,255});