opencv图片比较大法

void CompareHist()
{
    imshow("input1", image);
    imshow("input2", temp);
    Mat hsv1, hsv2;
    cvtColor(image, hsv1, COLOR_BGR2HSV);
    cvtColor(temp, hsv2, COLOR_BGR2HSV);
    int h_bins = 60; int s_bins = 64;
    int histSize[] = { h_bins, s_bins };
    float h_ranges[] = { 0, 180 };
    float s_ranges[] = { 0, 256 };
    const float* ranges[] = { h_ranges, s_ranges };
    int channels[] = { 0, 1 };
    Mat hist1, hist2;
    calcHist(&hsv1, 1, channels, Mat(), hist1, 2, histSize, ranges, true, false);
    calcHist(&hsv2, 1, channels, Mat(), hist2, 2, histSize, ranges, true, false);
    normalize(hist1, hist1, 0, 1, NORM_MINMAX, -1, Mat());
    normalize(hist2, hist2, 0, 1, NORM_MINMAX, -1, Mat());
    //4 种比较方法
    for (int i = 0; i < 4; i++)
    {
        int compare_method = i;
        double src1_src2 = compareHist(hist1, hist2, compare_method);
        qDebug() << " Method" << i << ": src1_src2:" << src1_src2;
        printf(" Method [%d]  : src1_src2 : %f \n", i, src1_src2);
    }
    waitKey(0);
}

void calcHist(const Mat * images, 
                int nimages, 
                const int* channels, 
                InputArray mask, 
                OutputArray hist, 
                int dims, 
                const int* histSize,
                const float** ranges,
                bool uniform = true, 
                bool accumulate = false);