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above formula would be cv::norm(g,h,CV_L2).

still note, that to compare histograms, you'd rather use a CHI_SQR or HELLINGER distance instead of L2, that's why there is compareHist()

above formula would be cv::norm(g,h,CV_L2)cv::norm(g,h).

still note, that to compare histograms, you'd rather use a CHI_SQR or HELLINGER distance instead of L2, that's why there is compareHist()

above formula would be cv::norm(g,h)cv::norm(g,h, NORM_L2SQR).

still note, that to compare histograms, you'd rather use a CHI_SQR or HELLINGER distance instead of L2, that's why there is compareHist()