Function cvCalcArrBackProject

deps/opencv/modules/imgproc/src/histogram.cpp:2794–2841

CV_IMPL void
cvCalcArrBackProject( CvArr** img, CvArr* dst, const CvHistogram* hist )
{
    if( !CV_IS_HIST(hist))
        CV_Error( CV_StsBadArg, "Bad histogram pointer" );

    if( !img )
        CV_Error( CV_StsNullPtr, "Null double array pointer" );

    int size[CV_MAX_DIM];
    int i, dims = cvGetDims( hist->bins, size );

    bool uniform = CV_IS_UNIFORM_HIST(hist);
    const float* uranges[CV_MAX_DIM] = {0};
    const float** ranges = 0;

    if( hist->type & CV_HIST_RANGES_FLAG )
    {
        ranges = (const float**)hist->thresh2;
        if( uniform )
        {
            for( i = 0; i < dims; i++ )
                uranges[i] = &hist->thresh[i][0];
            ranges = uranges;
        }
    }

    cv::vector<cv::Mat> images(dims);
    for( i = 0; i < dims; i++ )
        images[i] = cv::cvarrToMat(img[i]);

    cv::Mat _dst = cv::cvarrToMat(dst);

    CV_Assert( _dst.size() == images[0].size() && _dst.depth() == images[0].depth() );

    if( !CV_IS_SPARSE_HIST(hist) )
    {
        cv::Mat H((const CvMatND*)hist->bins);
        cv::calcBackProject( &images[0], (int)images.size(),
                            0, H, _dst, ranges, 1, uniform );
    }
    else
    {
        cv::SparseMat sH((const CvSparseMat*)hist->bins);
        cv::calcBackProject( &images[0], (int)images.size(),
                             0, sH, _dst, ranges, 1, uniform );
    }
}


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