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Computing Histogram of Oriented Gradients


The third parameter channels in the call to cv::calcHist(...) should not be 0 (which makes it a null pointer). OpenCV expects here a pointer to an array of indices depicting the channels of interest.

Since you want to use the first channels (index 0), your code should look like this:

int channels[] = { 0 };
calcHist(&cell_fourPx, 1, channels, ...);

Categories : C++

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