【opencv 源码剖析】 三、 morphOp 数学形态学滤波函数， 腐蚀和膨胀就是通过这个函数得到的

//

//_kernel : 形态学滤波的核

//anchor： 锚点再滤波核的位置

//iterations： 迭代次数

static void morphOp( int op, InputArray _src, OutputArray _dst,
                     InputArray _kernel,
                     Point anchor, int iterations,
                     int borderType, const Scalar& borderValue )
{
    Mat src = _src.getMat(), kernel = _kernel.getMat();
    Size ksize = kernel.data ? kernel.size() : Size(3,3);
    anchor = normalizeAnchor(anchor, ksize);

    CV_Assert( anchor.inside(Rect(0, 0, ksize.width, ksize.height)) );

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

    if( iterations == 0 || kernel.rows*kernel.cols == 1 )
    {
        src.copyTo(dst);
        return;
    }

    if( !kernel.data )
    {
        kernel = getStructuringElement(MORPH_RECT, Size(1+iterations*2,1+iterations*2));
        anchor = Point(iterations, iterations);
        iterations = 1;
    }
    else if( iterations > 1 && countNonZero(kernel) == kernel.rows*kernel.cols )
    {
        anchor = Point(anchor.x*iterations, anchor.y*iterations);
        kernel = getStructuringElement(MORPH_RECT,
                                       Size(ksize.width + (iterations-1)*(ksize.width-1),
                                            ksize.height + (iterations-1)*(ksize.height-1)),
                                       anchor);
        iterations = 1;
    }

    int nStripes = 1;
#if defined HAVE_TBB && defined HAVE_TEGRA_OPTIMIZATION    //这里是TBB指令集操作， 如果你的库没有使用tbb  则这句话不会执行
    if (src.data != dst.data && iterations == 1 &&  //NOTE: threads are not used for inplace processing
        (borderType & BORDER_ISOLATED) == 0 && //TODO: check border types
        src.rows >= 64 ) //NOTE: just heuristics
        nStripes = 4;
#endif

    parallel_for(BlockedRange(0, nStripes),
                 MorphologyRunner(src, dst, nStripes, iterations, op, kernel, anchor, borderType, borderType, borderValue));

    //Ptr<FilterEngine> f = createMorphologyFilter(op, src.type(),
    //                                             kernel, anchor, borderType, borderType, borderValue );

    //f->apply( src, dst );
    //for( int i = 1; i < iterations; i++ )
    //    f->apply( dst, dst );
}