opencv morphologyEx

opencv  morphologyEx

void cv::morphologyEx( InputArray _src, OutputArray _dst, int op,
                       InputArray _kernel, Point anchor, int iterations,
                       int borderType, const Scalar& borderValue )
{
    CV_INSTRUMENT_REGION()

    Mat kernel = _kernel.getMat();
    if (kernel.empty())
    {
        kernel = getStructuringElement(MORPH_RECT, Size(3,3), Point(1,1));
    }
#ifdef HAVE_OPENCL
    Size ksize = kernel.size();
    anchor = normalizeAnchor(anchor, ksize);

    CV_OCL_RUN(_dst.isUMat() && _src.dims() <= 2 && _src.channels() <= 4 &&
        anchor.x == ksize.width >> 1 && anchor.y == ksize.height >> 1 &&
        borderType == cv::BORDER_CONSTANT && borderValue == morphologyDefaultBorderValue(),
        ocl_morphologyEx(_src, _dst, op, kernel, anchor, iterations, borderType, borderValue))
#endif

    Mat src = _src.getMat(), temp;
    _dst.create(src.size(), src.type());
    Mat dst = _dst.getMat();

#if !IPP_DISABLE_MORPH_ADV
    CV_IPP_RUN_FAST(ipp_morphologyEx(op, src, dst, kernel, anchor, iterations, borderType, borderValue));
#endif

    switch( op )
    {
    case MORPH_ERODE:
        erode( src, dst, kernel, anchor, iterations, borderType, borderValue );
        break;
    case MORPH_DILATE:
        dilate( src, dst, kernel, anchor, iterations, borderType, borderValue );
        break;
    case MORPH_OPEN:
        erode( src, dst, kernel, anchor, iterations, borderType, borderValue );
        dilate( dst, dst, kernel, anchor, iterations, borderType, borderValue );
        break;
    case MORPH_CLOSE:
        dilate( src, dst, kernel, anchor, iterations, borderType, borderValue );
        erode( dst, dst, kernel, anchor, iterations, borderType, borderValue );
        break;
    case MORPH_GRADIENT:
        erode( src, temp, kernel, anchor, iterations, borderType, borderValue );
        dilate( src, dst, kernel, anchor, iterations, borderType, borderValue );
        dst -= temp;
        break;
    case MORPH_TOPHAT:
        if( src.data != dst.data )
            temp = dst;
        erode( src, temp, kernel, anchor, iterations, borderType, borderValue );
        dilate( temp, temp, kernel, anchor, iterations, borderType, borderValue );
        dst = src - temp;
        break;
    case MORPH_BLACKHAT:
        if( src.data != dst.data )
            temp = dst;
        dilate( src, temp, kernel, anchor, iterations, borderType, borderValue );
        erode( temp, temp, kernel, anchor, iterations, borderType, borderValue );
        dst = temp - src;
        break;
    case MORPH_HITMISS:
        CV_Assert(src.type() == CV_8UC1);
        if(countNonZero(kernel) <=0)
        {
            src.copyTo(dst);
            break;
        }
        {
            Mat k1, k2, e1, e2;
            k1 = (kernel == 1);
            k2 = (kernel == -1);

            if (countNonZero(k1) <= 0)
                e1 = src;
            else
                erode(src, e1, k1, anchor, iterations, borderType, borderValue);

            Mat src_complement;
            bitwise_not(src, src_complement);
            if (countNonZero(k2) <= 0)
                e2 = src_complement;
            else
                erode(src_complement, e2, k2, anchor, iterations, borderType, borderValue);
            dst = e1 & e2;
        }
        break;
    default:
        CV_Error( CV_StsBadArg, "unknown morphological operation" );
    }
}

代码参考：opencv3_4_1opencv-3.4.1modulesimgprocsrcmorph.cpp

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