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int imgCount = 1;
int dims = 3;
const int sizes[] = {256,256,256};
const int channels[] = {0,1,2};
float rRange[] = {0,256};
float gRange[] = {0,256};
float bRange[] = {0,256};
const float *ranges[] = {rRange,gRange,bRange};
Mat mask = Mat();
calcHist(&src, imgCount, channels, mask, hist, dims, sizes, ranges);