root/modules/imgproc/src/templmatch.cpp

DEFINITIONS

1. extractFirstChannel_32F
2. sumTemplate
3. useNaive
4. create
5. convolve_dft
6. convolve_32F
7. matchTemplateNaive_CCORR
8. matchTemplate_CCORR
9. matchTemplate_CCORR_NORMED
10. matchTemplateNaive_SQDIFF
11. matchTemplate_SQDIFF
12. matchTemplate_SQDIFF_NORMED
13. matchTemplate_CCOEFF
14. matchTemplate_CCOEFF_NORMED
15. ocl_matchTemplate
16. ipp_crossCorr
17. ipp_sqrDistance
18. crossCorr
19. matchTemplateMask
20. matchTemplate
21. cvMatchTemplate

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#include "precomp.hpp"
#include "opencl_kernels_imgproc.hpp"

////////////////////////////////////////////////// matchTemplate //////////////////////////////////////////////////////////

namespace cv
{

#ifdef HAVE_OPENCL

/////////////////////////////////////////////////// CCORR //////////////////////////////////////////////////////////////

enum
{
    SUM_1 = 0, SUM_2 = 1
};

static bool extractFirstChannel_32F(InputArray _image, OutputArray _result, int cn)
{
    int depth = _image.depth();

    ocl::Device dev = ocl::Device::getDefault();
    int pxPerWIy = (dev.isIntel() && (dev.type() & ocl::Device::TYPE_GPU)) ? 4 : 1;

    ocl::Kernel k("extractFirstChannel", ocl::imgproc::match_template_oclsrc, format("-D FIRST_CHANNEL -D T1=%s -D cn=%d -D PIX_PER_WI_Y=%d",
                                                                            ocl::typeToStr(depth), cn, pxPerWIy));
    if (k.empty())
        return false;

    UMat image  = _image.getUMat();
    UMat result = _result.getUMat();


    size_t globalsize[2] = {result.cols, (result.rows+pxPerWIy-1)/pxPerWIy};
    return k.args(ocl::KernelArg::ReadOnlyNoSize(image), ocl::KernelArg::WriteOnly(result)).run( 2, globalsize, NULL, false);
}

static bool sumTemplate(InputArray _src, UMat & result)
{
    int type = _src.type(), depth = CV_MAT_DEPTH(type), cn = CV_MAT_CN(type);
    int wdepth = CV_32F, wtype = CV_MAKE_TYPE(wdepth, cn);
    size_t wgs = ocl::Device::getDefault().maxWorkGroupSize();

    int wgs2_aligned = 1;
    while (wgs2_aligned < (int)wgs)
        wgs2_aligned <<= 1;
    wgs2_aligned >>= 1;

    char cvt[40];
    ocl::Kernel k("calcSum", ocl::imgproc::match_template_oclsrc,
                  format("-D CALC_SUM -D T=%s -D T1=%s -D WT=%s -D cn=%d -D convertToWT=%s -D WGS=%d -D WGS2_ALIGNED=%d",
                         ocl::typeToStr(type), ocl::typeToStr(depth), ocl::typeToStr(wtype), cn,
                         ocl::convertTypeStr(depth, wdepth, cn, cvt),
                         (int)wgs, wgs2_aligned));
    if (k.empty())
        return false;

    UMat src = _src.getUMat();
    result.create(1, 1, CV_32FC1);

    ocl::KernelArg srcarg = ocl::KernelArg::ReadOnlyNoSize(src),
            resarg = ocl::KernelArg::PtrWriteOnly(result);

    k.args(srcarg, src.cols, (int)src.total(), resarg);

    size_t globalsize = wgs;
    return k.run(1, &globalsize, &wgs, false);
}

static bool useNaive(Size size)
{
    int dft_size = 18;
    return size.height < dft_size && size.width < dft_size;
}

struct ConvolveBuf
{
    Size result_size;
    Size block_size;
    Size user_block_size;
    Size dft_size;

    UMat image_spect, templ_spect, result_spect;
    UMat image_block, templ_block, result_data;

    void create(Size image_size, Size templ_size);
};

void ConvolveBuf::create(Size image_size, Size templ_size)
{
    result_size = Size(image_size.width - templ_size.width + 1,
                       image_size.height - templ_size.height + 1);

    const double blockScale = 4.5;
    const int minBlockSize = 256;

    block_size.width = cvRound(result_size.width*blockScale);
    block_size.width = std::max( block_size.width, minBlockSize - templ_size.width + 1 );
    block_size.width = std::min( block_size.width, result_size.width );
    block_size.height = cvRound(templ_size.height*blockScale);
    block_size.height = std::max( block_size.height, minBlockSize - templ_size.height + 1 );
    block_size.height = std::min( block_size.height, result_size.height );

    dft_size.width = std::max(getOptimalDFTSize(block_size.width + templ_size.width - 1), 2);
    dft_size.height = getOptimalDFTSize(block_size.height + templ_size.height - 1);
    if( dft_size.width <= 0 || dft_size.height <= 0 )
        CV_Error( CV_StsOutOfRange, "the input arrays are too big" );

    // recompute block size
    block_size.width = dft_size.width - templ_size.width + 1;
    block_size.width = std::min( block_size.width, result_size.width);
    block_size.height = dft_size.height - templ_size.height + 1;
    block_size.height = std::min( block_size.height, result_size.height );

    image_block.create(dft_size, CV_32F);
    templ_block.create(dft_size, CV_32F);
    result_data.create(dft_size, CV_32F);

    image_spect.create(dft_size.height, dft_size.width / 2 + 1, CV_32FC2);
    templ_spect.create(dft_size.height, dft_size.width / 2 + 1, CV_32FC2);
    result_spect.create(dft_size.height, dft_size.width / 2 + 1, CV_32FC2);

    // Use maximum result matrix block size for the estimated DFT block size
    block_size.width = std::min(dft_size.width - templ_size.width + 1, result_size.width);
    block_size.height = std::min(dft_size.height - templ_size.height + 1, result_size.height);
}

static bool convolve_dft(InputArray _image, InputArray _templ, OutputArray _result)
{
    ConvolveBuf buf;
    CV_Assert(_image.type() == CV_32F);
    CV_Assert(_templ.type() == CV_32F);

    buf.create(_image.size(), _templ.size());
    _result.create(buf.result_size, CV_32F);

    UMat image  = _image.getUMat();
    UMat templ  = _templ.getUMat();

    UMat result = _result.getUMat();

    Size& block_size = buf.block_size;
    Size& dft_size = buf.dft_size;

    UMat& image_block = buf.image_block;
    UMat& templ_block = buf.templ_block;
    UMat& result_data = buf.result_data;

    UMat& image_spect = buf.image_spect;
    UMat& templ_spect = buf.templ_spect;
    UMat& result_spect = buf.result_spect;

    UMat templ_roi = templ;
    copyMakeBorder(templ_roi, templ_block, 0, templ_block.rows - templ_roi.rows, 0,
                   templ_block.cols - templ_roi.cols, BORDER_ISOLATED);

    dft(templ_block, templ_spect, 0, templ.rows);

    // Process all blocks of the result matrix
    for (int y = 0; y < result.rows; y += block_size.height)
    {
        for (int x = 0; x < result.cols; x += block_size.width)
        {
            Size image_roi_size(std::min(x + dft_size.width, image.cols) - x,
                                std::min(y + dft_size.height, image.rows) - y);
            Rect roi0(x, y, image_roi_size.width, image_roi_size.height);

            UMat image_roi(image, roi0);

            copyMakeBorder(image_roi, image_block, 0, image_block.rows - image_roi.rows,
                           0, image_block.cols - image_roi.cols, BORDER_ISOLATED);

            dft(image_block, image_spect, 0);

            mulSpectrums(image_spect, templ_spect, result_spect, 0, true);

            dft(result_spect, result_data, cv::DFT_INVERSE | cv::DFT_REAL_OUTPUT | cv::DFT_SCALE);

            Size result_roi_size(std::min(x + block_size.width, result.cols) - x,
                                 std::min(y + block_size.height, result.rows) - y);

            Rect roi1(x, y, result_roi_size.width, result_roi_size.height);
            Rect roi2(0, 0, result_roi_size.width, result_roi_size.height);

            UMat result_roi(result, roi1);
            UMat result_block(result_data, roi2);

            result_block.copyTo(result_roi);
        }
    }
    return true;
}

static bool convolve_32F(InputArray _image, InputArray _templ, OutputArray _result)
{
    _result.create(_image.rows() - _templ.rows() + 1, _image.cols() - _templ.cols() + 1, CV_32F);

    if (_image.channels() == 1)
        return(convolve_dft(_image, _templ, _result));
    else
    {
        UMat image = _image.getUMat();
        UMat templ = _templ.getUMat();
        UMat result_(image.rows-templ.rows+1,(image.cols-templ.cols+1)*image.channels(), CV_32F);
        bool ok = convolve_dft(image.reshape(1), templ.reshape(1), result_);
        if (ok==false)
            return false;
        UMat result = _result.getUMat();
        return (extractFirstChannel_32F(result_, _result, _image.channels()));
    }
}

static bool matchTemplateNaive_CCORR(InputArray _image, InputArray _templ, OutputArray _result)
{
    int type = _image.type(), depth = CV_MAT_DEPTH(type), cn = CV_MAT_CN(type);
    int wdepth = CV_32F, wtype = CV_MAKE_TYPE(wdepth, cn);

    ocl::Device dev = ocl::Device::getDefault();
    int pxPerWIx = (cn==1 && dev.isIntel() && (dev.type() & ocl::Device::TYPE_GPU)) ? 4 : 1;
    int rated_cn = cn;
    int wtype1 = wtype;

    if (pxPerWIx!=1)
    {
        rated_cn = pxPerWIx;
        type = CV_MAKE_TYPE(depth, rated_cn);
        wtype1 = CV_MAKE_TYPE(wdepth, rated_cn);
    }

    char cvt[40];
    char cvt1[40];
    const char* convertToWT1 = ocl::convertTypeStr(depth, wdepth, cn, cvt);
    const char* convertToWT = ocl::convertTypeStr(depth, wdepth, rated_cn, cvt1);

    ocl::Kernel k("matchTemplate_Naive_CCORR", ocl::imgproc::match_template_oclsrc,
                  format("-D CCORR -D T=%s -D T1=%s -D WT=%s -D WT1=%s -D convertToWT=%s -D convertToWT1=%s -D cn=%d -D PIX_PER_WI_X=%d", ocl::typeToStr(type), ocl::typeToStr(depth), ocl::typeToStr(wtype1), ocl::typeToStr(wtype),
                         convertToWT, convertToWT1, cn, pxPerWIx));
    if (k.empty())
        return false;

    UMat image = _image.getUMat(), templ = _templ.getUMat();
    _result.create(image.rows - templ.rows + 1, image.cols - templ.cols + 1, CV_32FC1);
    UMat result = _result.getUMat();

    k.args(ocl::KernelArg::ReadOnlyNoSize(image), ocl::KernelArg::ReadOnly(templ),
           ocl::KernelArg::WriteOnly(result));

    size_t globalsize[2] = { (result.cols+pxPerWIx-1)/pxPerWIx, result.rows};
    return k.run(2, globalsize, NULL, false);
}


static bool matchTemplate_CCORR(InputArray _image, InputArray _templ, OutputArray _result)
{
    if (useNaive(_templ.size()))
        return( matchTemplateNaive_CCORR(_image, _templ, _result));
    else
    {
        if(_image.depth() == CV_8U)
        {
            UMat imagef, templf;
            UMat image = _image.getUMat();
            UMat templ = _templ.getUMat();
            image.convertTo(imagef, CV_32F);
            templ.convertTo(templf, CV_32F);
            return(convolve_32F(imagef, templf, _result));
        }
        else
        {
            return(convolve_32F(_image, _templ, _result));
        }
    }
}

static bool matchTemplate_CCORR_NORMED(InputArray _image, InputArray _templ, OutputArray _result)
{
    matchTemplate(_image, _templ, _result, CV_TM_CCORR);

    int type = _image.type(), cn = CV_MAT_CN(type);

    ocl::Kernel k("matchTemplate_CCORR_NORMED", ocl::imgproc::match_template_oclsrc,
                  format("-D CCORR_NORMED -D T=%s -D cn=%d", ocl::typeToStr(type), cn));
    if (k.empty())
        return false;

    UMat image = _image.getUMat(), templ = _templ.getUMat();
    _result.create(image.rows - templ.rows + 1, image.cols - templ.cols + 1, CV_32FC1);
    UMat result = _result.getUMat();

    UMat image_sums, image_sqsums;
    integral(image.reshape(1), image_sums, image_sqsums, CV_32F, CV_32F);

    UMat templ_sqsum;
    if (!sumTemplate(templ, templ_sqsum))
        return false;

    k.args(ocl::KernelArg::ReadOnlyNoSize(image_sqsums), ocl::KernelArg::ReadWrite(result),
           templ.rows, templ.cols, ocl::KernelArg::PtrReadOnly(templ_sqsum));

    size_t globalsize[2] = { result.cols, result.rows };
    return k.run(2, globalsize, NULL, false);
}

////////////////////////////////////// SQDIFF //////////////////////////////////////////////////////////////

static bool matchTemplateNaive_SQDIFF(InputArray _image, InputArray _templ, OutputArray _result)
{
    int type = _image.type(), depth = CV_MAT_DEPTH(type), cn = CV_MAT_CN(type);
    int wdepth = CV_32F, wtype = CV_MAKE_TYPE(wdepth, cn);

    char cvt[40];
    ocl::Kernel k("matchTemplate_Naive_SQDIFF", ocl::imgproc::match_template_oclsrc,
                  format("-D SQDIFF -D T=%s -D T1=%s -D WT=%s -D convertToWT=%s -D cn=%d", ocl::typeToStr(type), ocl::typeToStr(depth),
                         ocl::typeToStr(wtype), ocl::convertTypeStr(depth, wdepth, cn, cvt), cn));
    if (k.empty())
        return false;

    UMat image = _image.getUMat(), templ = _templ.getUMat();
    _result.create(image.rows - templ.rows + 1, image.cols - templ.cols + 1, CV_32F);
    UMat result = _result.getUMat();

    k.args(ocl::KernelArg::ReadOnlyNoSize(image), ocl::KernelArg::ReadOnly(templ),
           ocl::KernelArg::WriteOnly(result));

    size_t globalsize[2] = { result.cols, result.rows };
    return k.run(2, globalsize, NULL, false);
}

static bool matchTemplate_SQDIFF(InputArray _image, InputArray _templ, OutputArray _result)
{
    if (useNaive(_templ.size()))
        return( matchTemplateNaive_SQDIFF(_image, _templ, _result));
    else
    {
        matchTemplate(_image, _templ, _result, CV_TM_CCORR);

        int type = _image.type(), cn = CV_MAT_CN(type);

        ocl::Kernel k("matchTemplate_Prepared_SQDIFF", ocl::imgproc::match_template_oclsrc,
                  format("-D SQDIFF_PREPARED -D T=%s -D cn=%d", ocl::typeToStr(type),  cn));
        if (k.empty())
            return false;

        UMat image = _image.getUMat(), templ = _templ.getUMat();
        _result.create(image.rows - templ.rows + 1, image.cols - templ.cols + 1, CV_32F);
        UMat result = _result.getUMat();

        UMat image_sums, image_sqsums;
        integral(image.reshape(1), image_sums, image_sqsums, CV_32F, CV_32F);

        UMat templ_sqsum;
        if (!sumTemplate(_templ, templ_sqsum))
            return false;

        k.args(ocl::KernelArg::ReadOnlyNoSize(image_sqsums), ocl::KernelArg::ReadWrite(result),
           templ.rows, templ.cols, ocl::KernelArg::PtrReadOnly(templ_sqsum));

        size_t globalsize[2] = { result.cols, result.rows };

        return k.run(2, globalsize, NULL, false);
    }
}

static bool matchTemplate_SQDIFF_NORMED(InputArray _image, InputArray _templ, OutputArray _result)
{
    matchTemplate(_image, _templ, _result, CV_TM_CCORR);

    int type = _image.type(), cn = CV_MAT_CN(type);

    ocl::Kernel k("matchTemplate_SQDIFF_NORMED", ocl::imgproc::match_template_oclsrc,
                  format("-D SQDIFF_NORMED -D T=%s -D cn=%d", ocl::typeToStr(type),  cn));
    if (k.empty())
        return false;

    UMat image = _image.getUMat(), templ = _templ.getUMat();
    _result.create(image.rows - templ.rows + 1, image.cols - templ.cols + 1, CV_32F);
    UMat result = _result.getUMat();

    UMat image_sums, image_sqsums;
    integral(image.reshape(1), image_sums, image_sqsums, CV_32F, CV_32F);

    UMat templ_sqsum;
    if (!sumTemplate(_templ, templ_sqsum))
        return false;

    k.args(ocl::KernelArg::ReadOnlyNoSize(image_sqsums), ocl::KernelArg::ReadWrite(result),
           templ.rows, templ.cols, ocl::KernelArg::PtrReadOnly(templ_sqsum));

    size_t globalsize[2] = { result.cols, result.rows };

    return k.run(2, globalsize, NULL, false);
}

///////////////////////////////////// CCOEFF /////////////////////////////////////////////////////////////////

static bool matchTemplate_CCOEFF(InputArray _image, InputArray _templ, OutputArray _result)
{
    matchTemplate(_image, _templ, _result, CV_TM_CCORR);

    UMat image_sums, temp;
    integral(_image, image_sums, CV_32F);

    int type = image_sums.type(), depth = CV_MAT_DEPTH(type), cn = CV_MAT_CN(type);

    ocl::Kernel k("matchTemplate_Prepared_CCOEFF", ocl::imgproc::match_template_oclsrc,
                  format("-D CCOEFF -D T=%s -D T1=%s -D cn=%d", ocl::typeToStr(type), ocl::typeToStr(depth), cn));
    if (k.empty())
        return false;

    UMat templ  = _templ.getUMat();
    UMat result = _result.getUMat();

    if (cn==1)
    {
        Scalar templMean = mean(templ);
        float templ_sum = (float)templMean[0];

        k.args(ocl::KernelArg::ReadOnlyNoSize(image_sums), ocl::KernelArg::ReadWrite(result), templ.rows, templ.cols, templ_sum);
    }
    else
    {
        Vec4f templ_sum = Vec4f::all(0);
        templ_sum = (Vec4f)mean(templ);

       k.args(ocl::KernelArg::ReadOnlyNoSize(image_sums), ocl::KernelArg::ReadWrite(result), templ.rows, templ.cols, templ_sum);    }

    size_t globalsize[2] = { result.cols, result.rows };
    return k.run(2, globalsize, NULL, false);
}

static bool matchTemplate_CCOEFF_NORMED(InputArray _image, InputArray _templ, OutputArray _result)
{
    matchTemplate(_image, _templ, _result, CV_TM_CCORR);

    UMat temp, image_sums, image_sqsums;
    integral(_image, image_sums, image_sqsums, CV_32F, CV_32F);

    int type = image_sums.type(), depth = CV_MAT_DEPTH(type), cn = CV_MAT_CN(type);

    ocl::Kernel k("matchTemplate_CCOEFF_NORMED", ocl::imgproc::match_template_oclsrc,
        format("-D CCOEFF_NORMED -D T=%s -D T1=%s -D cn=%d", ocl::typeToStr(type), ocl::typeToStr(depth), cn));
    if (k.empty())
        return false;

    UMat templ = _templ.getUMat();
    Size size = _image.size(), tsize = templ.size();
    _result.create(size.height - templ.rows + 1, size.width - templ.cols + 1, CV_32F);
    UMat result = _result.getUMat();

    float scale = 1.f / tsize.area();

    if (cn == 1)
    {
        float templ_sum = (float)sum(templ)[0];

        multiply(templ, templ, temp, 1, CV_32F);
        float templ_sqsum = (float)sum(temp)[0];

        templ_sqsum -= scale * templ_sum * templ_sum;
        templ_sum   *= scale;

        if (templ_sqsum < DBL_EPSILON)
        {
            result = Scalar::all(1);
            return true;
        }

        k.args(ocl::KernelArg::ReadOnlyNoSize(image_sums), ocl::KernelArg::ReadOnlyNoSize(image_sqsums),
                      ocl::KernelArg::ReadWrite(result), templ.rows, templ.cols, scale, templ_sum, templ_sqsum);
    }
    else
    {
        Vec4f templ_sum = Vec4f::all(0), templ_sqsum = Vec4f::all(0);
        templ_sum = sum(templ);

        multiply(templ, templ, temp, 1, CV_32F);
        templ_sqsum = sum(temp);

        float templ_sqsum_sum = 0;
        for (int i = 0; i < cn; i ++)
            templ_sqsum_sum += templ_sqsum[i] - scale * templ_sum[i] * templ_sum[i];

        templ_sum *= scale;

        if (templ_sqsum_sum < DBL_EPSILON)
        {
            result = Scalar::all(1);
            return true;
        }

        k.args(ocl::KernelArg::ReadOnlyNoSize(image_sums), ocl::KernelArg::ReadOnlyNoSize(image_sqsums),
                   ocl::KernelArg::ReadWrite(result), templ.rows, templ.cols, scale,
                   templ_sum, templ_sqsum_sum);    }

    size_t globalsize[2] = { result.cols, result.rows };
    return k.run(2, globalsize, NULL, false);
}

///////////////////////////////////////////////////////////////////////////////////////////////////////////

static bool ocl_matchTemplate( InputArray _img, InputArray _templ, OutputArray _result, int method)
{
    int cn = _img.channels();

    if (cn > 4)
        return false;

    typedef bool (*Caller)(InputArray _img, InputArray _templ, OutputArray _result);

    static const Caller callers[] =
    {
        matchTemplate_SQDIFF, matchTemplate_SQDIFF_NORMED, matchTemplate_CCORR,
        matchTemplate_CCORR_NORMED, matchTemplate_CCOEFF, matchTemplate_CCOEFF_NORMED
    };
    const Caller caller = callers[method];

    return caller(_img, _templ, _result);
}

#endif

#if defined HAVE_IPP

typedef IppStatus (CV_STDCALL * ippimatchTemplate)(const void*, int, IppiSize, const void*, int, IppiSize, Ipp32f* , int , IppEnum , Ipp8u*);

static bool ipp_crossCorr(const Mat& src, const Mat& tpl, Mat& dst)
{
    IppStatus status;

    IppiSize srcRoiSize = {src.cols,src.rows};
    IppiSize tplRoiSize = {tpl.cols,tpl.rows};

    Ipp8u *pBuffer;
    int bufSize=0;

    int depth = src.depth();

    ippimatchTemplate ippFunc =
            depth==CV_8U ? (ippimatchTemplate)ippiCrossCorrNorm_8u32f_C1R:
            depth==CV_32F? (ippimatchTemplate)ippiCrossCorrNorm_32f_C1R: 0;

    if (ippFunc==0)
        return false;

    IppEnum funCfg = (IppEnum)(ippAlgAuto | ippiNormNone | ippiROIValid);

    status = ippiCrossCorrNormGetBufferSize(srcRoiSize, tplRoiSize, funCfg, &bufSize);
    if ( status < 0 )
        return false;

    pBuffer = ippsMalloc_8u( bufSize );

    status = ippFunc(src.ptr(), (int)src.step, srcRoiSize, tpl.ptr(), (int)tpl.step, tplRoiSize, dst.ptr<Ipp32f>(), (int)dst.step, funCfg, pBuffer);

    ippsFree( pBuffer );
    return status >= 0;
}

static bool ipp_sqrDistance(const Mat& src, const Mat& tpl, Mat& dst)
{
    IppStatus status;

    IppiSize srcRoiSize = {src.cols,src.rows};
    IppiSize tplRoiSize = {tpl.cols,tpl.rows};

    Ipp8u *pBuffer;
    int bufSize=0;

    int depth = src.depth();

    ippimatchTemplate ippFunc =
            depth==CV_8U ? (ippimatchTemplate)ippiSqrDistanceNorm_8u32f_C1R:
            depth==CV_32F? (ippimatchTemplate)ippiSqrDistanceNorm_32f_C1R: 0;

    if (ippFunc==0)
        return false;

    IppEnum funCfg = (IppEnum)(ippAlgAuto | ippiNormNone | ippiROIValid);

    status = ippiSqrDistanceNormGetBufferSize(srcRoiSize, tplRoiSize, funCfg, &bufSize);
    if ( status < 0 )
        return false;

    pBuffer = ippsMalloc_8u( bufSize );

    status = ippFunc(src.ptr(), (int)src.step, srcRoiSize, tpl.ptr(), (int)tpl.step, tplRoiSize, dst.ptr<Ipp32f>(), (int)dst.step, funCfg, pBuffer);

    ippsFree( pBuffer );
    return status >= 0;
}

#endif

void crossCorr( const Mat& img, const Mat& _templ, Mat& corr,
                Size corrsize, int ctype,
                Point anchor, double delta, int borderType )
{
    const double blockScale = 4.5;
    const int minBlockSize = 256;
    std::vector<uchar> buf;

    Mat templ = _templ;
    int depth = img.depth(), cn = img.channels();
    int tdepth = templ.depth(), tcn = templ.channels();
    int cdepth = CV_MAT_DEPTH(ctype), ccn = CV_MAT_CN(ctype);

    CV_Assert( img.dims <= 2 && templ.dims <= 2 && corr.dims <= 2 );

    if( depth != tdepth && tdepth != std::max(CV_32F, depth) )
    {
        _templ.convertTo(templ, std::max(CV_32F, depth));
        tdepth = templ.depth();
    }

    CV_Assert( depth == tdepth || tdepth == CV_32F);
    CV_Assert( corrsize.height <= img.rows + templ.rows - 1 &&
               corrsize.width <= img.cols + templ.cols - 1 );

    CV_Assert( ccn == 1 || delta == 0 );

    corr.create(corrsize, ctype);

    int maxDepth = depth > CV_8S ? CV_64F : std::max(std::max(CV_32F, tdepth), cdepth);
    Size blocksize, dftsize;

    blocksize.width = cvRound(templ.cols*blockScale);
    blocksize.width = std::max( blocksize.width, minBlockSize - templ.cols + 1 );
    blocksize.width = std::min( blocksize.width, corr.cols );
    blocksize.height = cvRound(templ.rows*blockScale);
    blocksize.height = std::max( blocksize.height, minBlockSize - templ.rows + 1 );
    blocksize.height = std::min( blocksize.height, corr.rows );

    dftsize.width = std::max(getOptimalDFTSize(blocksize.width + templ.cols - 1), 2);
    dftsize.height = getOptimalDFTSize(blocksize.height + templ.rows - 1);
    if( dftsize.width <= 0 || dftsize.height <= 0 )
        CV_Error( CV_StsOutOfRange, "the input arrays are too big" );

    // recompute block size
    blocksize.width = dftsize.width - templ.cols + 1;
    blocksize.width = MIN( blocksize.width, corr.cols );
    blocksize.height = dftsize.height - templ.rows + 1;
    blocksize.height = MIN( blocksize.height, corr.rows );

    Mat dftTempl( dftsize.height*tcn, dftsize.width, maxDepth );
    Mat dftImg( dftsize, maxDepth );

    int i, k, bufSize = 0;
    if( tcn > 1 && tdepth != maxDepth )
        bufSize = templ.cols*templ.rows*CV_ELEM_SIZE(tdepth);

    if( cn > 1 && depth != maxDepth )
        bufSize = std::max( bufSize, (blocksize.width + templ.cols - 1)*
            (blocksize.height + templ.rows - 1)*CV_ELEM_SIZE(depth));

    if( (ccn > 1 || cn > 1) && cdepth != maxDepth )
        bufSize = std::max( bufSize, blocksize.width*blocksize.height*CV_ELEM_SIZE(cdepth));

    buf.resize(bufSize);

    // compute DFT of each template plane
    for( k = 0; k < tcn; k++ )
    {
        int yofs = k*dftsize.height;
        Mat src = templ;
        Mat dst(dftTempl, Rect(0, yofs, dftsize.width, dftsize.height));
        Mat dst1(dftTempl, Rect(0, yofs, templ.cols, templ.rows));

        if( tcn > 1 )
        {
            src = tdepth == maxDepth ? dst1 : Mat(templ.size(), tdepth, &buf[0]);
            int pairs[] = {k, 0};
            mixChannels(&templ, 1, &src, 1, pairs, 1);
        }

        if( dst1.data != src.data )
            src.convertTo(dst1, dst1.depth());

        if( dst.cols > templ.cols )
        {
            Mat part(dst, Range(0, templ.rows), Range(templ.cols, dst.cols));
            part = Scalar::all(0);
        }
        dft(dst, dst, 0, templ.rows);
    }

    int tileCountX = (corr.cols + blocksize.width - 1)/blocksize.width;
    int tileCountY = (corr.rows + blocksize.height - 1)/blocksize.height;
    int tileCount = tileCountX * tileCountY;

    Size wholeSize = img.size();
    Point roiofs(0,0);
    Mat img0 = img;

    if( !(borderType & BORDER_ISOLATED) )
    {
        img.locateROI(wholeSize, roiofs);
        img0.adjustROI(roiofs.y, wholeSize.height-img.rows-roiofs.y,
                       roiofs.x, wholeSize.width-img.cols-roiofs.x);
    }
    borderType |= BORDER_ISOLATED;

    // calculate correlation by blocks
    for( i = 0; i < tileCount; i++ )
    {
        int x = (i%tileCountX)*blocksize.width;
        int y = (i/tileCountX)*blocksize.height;

        Size bsz(std::min(blocksize.width, corr.cols - x),
                 std::min(blocksize.height, corr.rows - y));
        Size dsz(bsz.width + templ.cols - 1, bsz.height + templ.rows - 1);
        int x0 = x - anchor.x + roiofs.x, y0 = y - anchor.y + roiofs.y;
        int x1 = std::max(0, x0), y1 = std::max(0, y0);
        int x2 = std::min(img0.cols, x0 + dsz.width);
        int y2 = std::min(img0.rows, y0 + dsz.height);
        Mat src0(img0, Range(y1, y2), Range(x1, x2));
        Mat dst(dftImg, Rect(0, 0, dsz.width, dsz.height));
        Mat dst1(dftImg, Rect(x1-x0, y1-y0, x2-x1, y2-y1));
        Mat cdst(corr, Rect(x, y, bsz.width, bsz.height));

        for( k = 0; k < cn; k++ )
        {
            Mat src = src0;
            dftImg = Scalar::all(0);

            if( cn > 1 )
            {
                src = depth == maxDepth ? dst1 : Mat(y2-y1, x2-x1, depth, &buf[0]);
                int pairs[] = {k, 0};
                mixChannels(&src0, 1, &src, 1, pairs, 1);
            }

            if( dst1.data != src.data )
                src.convertTo(dst1, dst1.depth());

            if( x2 - x1 < dsz.width || y2 - y1 < dsz.height )
                copyMakeBorder(dst1, dst, y1-y0, dst.rows-dst1.rows-(y1-y0),
                               x1-x0, dst.cols-dst1.cols-(x1-x0), borderType);

            dft( dftImg, dftImg, 0, dsz.height );
            Mat dftTempl1(dftTempl, Rect(0, tcn > 1 ? k*dftsize.height : 0,
                                         dftsize.width, dftsize.height));
            mulSpectrums(dftImg, dftTempl1, dftImg, 0, true);
            dft( dftImg, dftImg, DFT_INVERSE + DFT_SCALE, bsz.height );

            src = dftImg(Rect(0, 0, bsz.width, bsz.height));

            if( ccn > 1 )
            {
                if( cdepth != maxDepth )
                {
                    Mat plane(bsz, cdepth, &buf[0]);
                    src.convertTo(plane, cdepth, 1, delta);
                    src = plane;
                }
                int pairs[] = {0, k};
                mixChannels(&src, 1, &cdst, 1, pairs, 1);
            }
            else
            {
                if( k == 0 )
                    src.convertTo(cdst, cdepth, 1, delta);
                else
                {
                    if( maxDepth != cdepth )
                    {
                        Mat plane(bsz, cdepth, &buf[0]);
                        src.convertTo(plane, cdepth);
                        src = plane;
                    }
                    add(src, cdst, cdst);
                }
            }
        }
    }
}

static void matchTemplateMask( InputArray _img, InputArray _templ, OutputArray _result, int method, InputArray _mask )
{
    int type = _img.type(), depth = CV_MAT_DEPTH(type), cn = CV_MAT_CN(type);
    CV_Assert( CV_TM_SQDIFF <= method && method <= CV_TM_CCOEFF_NORMED );
    CV_Assert( (depth == CV_8U || depth == CV_32F) && type == _templ.type() && _img.dims() <= 2 );

    Mat img = _img.getMat(), templ = _templ.getMat(), mask = _mask.getMat();
    int ttype = templ.type(), tdepth = CV_MAT_DEPTH(ttype), tcn = CV_MAT_CN(ttype);
    int mtype = img.type(), mdepth = CV_MAT_DEPTH(type), mcn = CV_MAT_CN(mtype);

    if (depth == CV_8U)
    {
        depth = CV_32F;
        type = CV_MAKETYPE(CV_32F, cn);
        img.convertTo(img, type, 1.0 / 255);
    }

    if (tdepth == CV_8U)
    {
        tdepth = CV_32F;
        ttype = CV_MAKETYPE(CV_32F, tcn);
        templ.convertTo(templ, ttype, 1.0 / 255);
    }

    if (mdepth == CV_8U)
    {
        mdepth = CV_32F;
        mtype = CV_MAKETYPE(CV_32F, mcn);
        compare(mask, Scalar::all(0), mask, CMP_NE);
        mask.convertTo(mask, mtype, 1.0 / 255);
    }

    Size corrSize(img.cols - templ.cols + 1, img.rows - templ.rows + 1);
    _result.create(corrSize, CV_32F);
    Mat result = _result.getMat();

    Mat img2 = img.mul(img);
    Mat mask2 = mask.mul(mask);
    Mat mask_templ = templ.mul(mask);
    Scalar templMean, templSdv;

    double templSum2 = 0;
    meanStdDev( mask_templ, templMean, templSdv );

    templSum2 = templSdv[0]*templSdv[0] + templSdv[1]*templSdv[1] + templSdv[2]*templSdv[2] + templSdv[3]*templSdv[3];
    templSum2 += templMean[0]*templMean[0] + templMean[1]*templMean[1] + templMean[2]*templMean[2] + templMean[3]*templMean[3];
    templSum2 *= ((double)templ.rows * templ.cols);

    if (method == CV_TM_SQDIFF)
    {
        Mat mask2_templ = templ.mul(mask2);

        Mat corr(corrSize, CV_32F);
        crossCorr( img, mask2_templ, corr, corr.size(), corr.type(), Point(0,0), 0, 0 );
        crossCorr( img2, mask, result, result.size(), result.type(), Point(0,0), 0, 0 );

        result -= corr * 2;
        result += templSum2;
    }
    else if (method == CV_TM_CCORR_NORMED)
    {
        if (templSum2 < DBL_EPSILON)
        {
            result = Scalar::all(1);
            return;
        }

        Mat corr(corrSize, CV_32F);
        crossCorr( img2, mask2, corr, corr.size(), corr.type(), Point(0,0), 0, 0 );
        crossCorr( img, mask_templ, result, result.size(), result.type(), Point(0,0), 0, 0 );

        sqrt(corr, corr);
        result = result.mul(1/corr);
        result /= std::sqrt(templSum2);
    }
    else
        CV_Error(Error::StsNotImplemented, "");
}
}

////////////////////////////////////////////////////////////////////////////////////////////////////////

void cv::matchTemplate( InputArray _img, InputArray _templ, OutputArray _result, int method, InputArray _mask )
{
    if (!_mask.empty())
    {
        cv::matchTemplateMask(_img, _templ, _result, method, _mask);
        return;
    }

    int type = _img.type(), depth = CV_MAT_DEPTH(type), cn = CV_MAT_CN(type);
    CV_Assert( CV_TM_SQDIFF <= method && method <= CV_TM_CCOEFF_NORMED );
    CV_Assert( (depth == CV_8U || depth == CV_32F) && type == _templ.type() && _img.dims() <= 2 );

    bool needswap = _img.size().height < _templ.size().height || _img.size().width < _templ.size().width;
    if (needswap)
    {
        CV_Assert(_img.size().height <= _templ.size().height && _img.size().width <= _templ.size().width);
    }

    CV_OCL_RUN(_img.dims() <= 2 && _result.isUMat(),
               (!needswap ? ocl_matchTemplate(_img, _templ, _result, method) : ocl_matchTemplate(_templ, _img, _result, method)))

    int numType = method == CV_TM_CCORR || method == CV_TM_CCORR_NORMED ? 0 :
                  method == CV_TM_CCOEFF || method == CV_TM_CCOEFF_NORMED ? 1 : 2;
    bool isNormed = method == CV_TM_CCORR_NORMED ||
                    method == CV_TM_SQDIFF_NORMED ||
                    method == CV_TM_CCOEFF_NORMED;

    Mat img = _img.getMat(), templ = _templ.getMat();
    if (needswap)
        std::swap(img, templ);

    Size corrSize(img.cols - templ.cols + 1, img.rows - templ.rows + 1);
    _result.create(corrSize, CV_32F);
    Mat result = _result.getMat();

#ifdef HAVE_TEGRA_OPTIMIZATION
    if (tegra::useTegra() && tegra::matchTemplate(img, templ, result, method))
        return;
#endif

#if defined HAVE_IPP
    bool useIppMT = false;
    CV_IPP_CHECK()
    {
        useIppMT = (templ.rows < img.rows/2 && templ.cols < img.cols/2);

        if (method == CV_TM_SQDIFF && cn == 1 && useIppMT)
        {
            if (ipp_sqrDistance(img, templ, result))
            {
                CV_IMPL_ADD(CV_IMPL_IPP);
                return;
            }
            setIppErrorStatus();
        }
    }
#endif

#if defined HAVE_IPP
    if (cn == 1 && useIppMT)
    {
        if (!ipp_crossCorr(img, templ, result))
        {
            setIppErrorStatus();
            crossCorr( img, templ, result, result.size(), result.type(), Point(0,0), 0, 0);
        }
        else
        {
            CV_IMPL_ADD(CV_IMPL_IPP);
        }
    }
    else
#endif
    crossCorr( img, templ, result, result.size(), result.type(), Point(0,0), 0, 0);

    if( method == CV_TM_CCORR )
        return;

    double invArea = 1./((double)templ.rows * templ.cols);

    Mat sum, sqsum;
    Scalar templMean, templSdv;
    double *q0 = 0, *q1 = 0, *q2 = 0, *q3 = 0;
    double templNorm = 0, templSum2 = 0;

    if( method == CV_TM_CCOEFF )
    {
        integral(img, sum, CV_64F);
        templMean = mean(templ);
    }
    else
    {
        integral(img, sum, sqsum, CV_64F);
        meanStdDev( templ, templMean, templSdv );

        templNorm = templSdv[0]*templSdv[0] + templSdv[1]*templSdv[1] + templSdv[2]*templSdv[2] + templSdv[3]*templSdv[3];

        if( templNorm < DBL_EPSILON && method == CV_TM_CCOEFF_NORMED )
        {
            result = Scalar::all(1);
            return;
        }

        templSum2 = templNorm + templMean[0]*templMean[0] + templMean[1]*templMean[1] + templMean[2]*templMean[2] + templMean[3]*templMean[3];

        if( numType != 1 )
        {
            templMean = Scalar::all(0);
            templNorm = templSum2;
        }

        templSum2 /= invArea;
        templNorm = std::sqrt(templNorm);
        templNorm /= std::sqrt(invArea); // care of accuracy here

        q0 = (double*)sqsum.data;
        q1 = q0 + templ.cols*cn;
        q2 = (double*)(sqsum.data + templ.rows*sqsum.step);
        q3 = q2 + templ.cols*cn;
    }

    double* p0 = (double*)sum.data;
    double* p1 = p0 + templ.cols*cn;
    double* p2 = (double*)(sum.data + templ.rows*sum.step);
    double* p3 = p2 + templ.cols*cn;

    int sumstep = sum.data ? (int)(sum.step / sizeof(double)) : 0;
    int sqstep = sqsum.data ? (int)(sqsum.step / sizeof(double)) : 0;

    int i, j, k;

    for( i = 0; i < result.rows; i++ )
    {
        float* rrow = result.ptr<float>(i);
        int idx = i * sumstep;
        int idx2 = i * sqstep;

        for( j = 0; j < result.cols; j++, idx += cn, idx2 += cn )
        {
            double num = rrow[j], t;
            double wndMean2 = 0, wndSum2 = 0;

            if( numType == 1 )
            {
                for( k = 0; k < cn; k++ )
                {
                    t = p0[idx+k] - p1[idx+k] - p2[idx+k] + p3[idx+k];
                    wndMean2 += t*t;
                    num -= t*templMean[k];
                }

                wndMean2 *= invArea;
            }

            if( isNormed || numType == 2 )
            {
                for( k = 0; k < cn; k++ )
                {
                    t = q0[idx2+k] - q1[idx2+k] - q2[idx2+k] + q3[idx2+k];
                    wndSum2 += t;
                }

                if( numType == 2 )
                {
                    num = wndSum2 - 2*num + templSum2;
                    num = MAX(num, 0.);
                }
            }

            if( isNormed )
            {
                t = std::sqrt(MAX(wndSum2 - wndMean2,0))*templNorm;
                if( fabs(num) < t )
                    num /= t;
                else if( fabs(num) < t*1.125 )
                    num = num > 0 ? 1 : -1;
                else
                    num = method != CV_TM_SQDIFF_NORMED ? 0 : 1;
            }

            rrow[j] = (float)num;
        }
    }
}


CV_IMPL void
cvMatchTemplate( const CvArr* _img, const CvArr* _templ, CvArr* _result, int method )
{
    cv::Mat img = cv::cvarrToMat(_img), templ = cv::cvarrToMat(_templ),
        result = cv::cvarrToMat(_result);
    CV_Assert( result.size() == cv::Size(std::abs(img.cols - templ.cols) + 1,
                                         std::abs(img.rows - templ.rows) + 1) &&
              result.type() == CV_32F );
    matchTemplate(img, templ, result, method);
}

/* End of file. */