opencv凸包求取源码解析

最新推荐文章于 2024-06-25 16:19:07 发布

hahaha_2017

最新推荐文章于 2024-06-25 16:19:07 发布

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CV_IMPL CvSeq* cvConvexityDefects( const CvArr* array,
                                   const CvArr* hullarray,
                                   CvMemStorage* storage )
{
    CvSeq* defects = 0;

    int i, index;
    CvPoint* hull_cur;

    /* is orientation of hull different from contour one */
    int rev_orientation;

    CvContour contour_header;
    union { CvContour c; CvSeq s; } hull_header;
    CvSeqBlock block, hullblock;
    CvSeq *ptseq = (CvSeq*)array, *hull = (CvSeq*)hullarray;

    CvSeqReader hull_reader;
    CvSeqReader ptseq_reader;                                                                    //读序列，应该是读轮廓序列
    CvSeqWriter writer;
    int is_index;

    if( CV_IS_SEQ( ptseq ))
    {
        if( !CV_IS_SEQ_POINT_SET( ptseq ))
            CV_Error( CV_StsUnsupportedFormat,
                "Input sequence is not a sequence of points" );
        if( !storage )
            storage = ptseq->storage;
    }
    else
    {
        ptseq = cvPointSeqFromMat( CV_SEQ_KIND_GENERIC, array, &contour_header, &block );
    }

    if( CV_SEQ_ELTYPE( ptseq ) != CV_32SC2 )
        CV_Error( CV_StsUnsupportedFormat, "Floating-point coordinates are not supported here" );

    if( CV_IS_SEQ( hull ))
    {
        int hulltype = CV_SEQ_ELTYPE( hull );
        if( hulltype != CV_SEQ_ELTYPE_PPOINT && hulltype != CV_SEQ_ELTYPE_INDEX )
            CV_Error( CV_StsUnsupportedFormat,
                "Convex hull must rep