Method norm

deps/opencv/modules/core/src/stat.cpp:1899–2259

double cv::norm( InputArray _src1, InputArray _src2, int normType, InputArray _mask )
{
    if( normType & CV_RELATIVE )
    {
#if defined (HAVE_IPP) && (IPP_VERSION_MAJOR >= 7)
        Mat src1 = _src1.getMat(), src2 = _src2.getMat(), mask = _mask.getMat();

        CV_Assert( src1.size == src2.size && src1.type() == src2.type() );

        normType &= 7;
        CV_Assert( normType == NORM_INF || normType == NORM_L1 || normType == NORM_L2 || normType == NORM_L2SQR ||
                ((normType == NORM_HAMMING || normType == NORM_HAMMING2) && src1.type() == CV_8U) );
        size_t total_size = src1.total();
        int rows = src1.size[0], cols = (int)(total_size/rows);
        if( (src1.dims == 2 || (src1.isContinuous() && src2.isContinuous() && mask.isContinuous()))
            && cols > 0 && (size_t)rows*cols == total_size
            && (normType == NORM_INF || normType == NORM_L1 ||
                normType == NORM_L2 || normType == NORM_L2SQR) )
        {
            IppiSize sz = { cols, rows };
            int type = src1.type();
            if( !mask.empty() )
            {
                typedef IppStatus (CV_STDCALL* ippiMaskNormRelFuncC1)(const void *, int, const void *, int, const void *, int, IppiSize, Ipp64f *);
                ippiMaskNormRelFuncC1 ippFuncC1 =
                    normType == NORM_INF ?
                    (type == CV_8UC1 ? (ippiMaskNormRelFuncC1)ippiNormRel_Inf_8u_C1MR :
                    type == CV_8SC1 ? (ippiMaskNormRelFuncC1)ippiNormRel_Inf_8s_C1MR :
                    type == CV_16UC1 ? (ippiMaskNormRelFuncC1)ippiNormRel_Inf_16u_C1MR :
                    type == CV_32FC1 ? (ippiMaskNormRelFuncC1)ippiNormRel_Inf_32f_C1MR :
                    0) :
                    normType == NORM_L1 ?
                    (type == CV_8UC1 ? (ippiMaskNormRelFuncC1)ippiNormRel_L1_8u_C1MR :
                    type == CV_8SC1 ? (ippiMaskNormRelFuncC1)ippiNormRel_L1_8s_C1MR :
                    type == CV_16UC1 ? (ippiMaskNormRelFuncC1)ippiNormRel_L1_16u_C1MR :
                    type == CV_32FC1 ? (ippiMaskNormRelFuncC1)ippiNormRel_L1_32f_C1MR :
                    0) :
                    normType == NORM_L2 || normType == NORM_L2SQR ?
                    (type == CV_8UC1 ? (ippiMaskNormRelFuncC1)ippiNormRel_L2_8u_C1MR :
                    type == CV_8SC1 ? (ippiMaskNormRelFuncC1)ippiNormRel_L2_8s_C1MR :
                    type == CV_16UC1 ? (ippiMaskNormRelFuncC1)ippiNormRel_L2_16u_C1MR :
                    type == CV_32FC1 ? (ippiMaskNormRelFuncC1)ippiNormRel_L2_32f_C1MR :
                    0) : 0;
                if( ippFuncC1 )
                {
                    Ipp64f norm;
                    if( ippFuncC1(src1.data, (int)src1.step[0], src2.data, (int)src2.step[0], mask.data, (int)mask.step[0], sz, &norm) >= 0 )
                        return normType == NORM_L2SQR ? (double)(norm * norm) : (double)norm;
                }
            }
            else
            {
                typedef IppStatus (CV_STDCALL* ippiNormRelFunc)(const void *, int, const void *, int, IppiSize, Ipp64f *, IppHintAlgorithm hint);
                ippiNormRelFunc ippFunc =
                    normType == NORM_INF ?
                    (type == CV_8UC1 ? (ippiNormRelFunc)ippiNormRel_Inf_8u_C1R :
                    type == CV_16UC1 ? (ippiNormRelFunc)ippiNormRel_Inf_16u_C1R :
                    type == CV_16SC1 ? (ippiNormRelFunc)ippiNormRel_Inf_16s_C1R :