自学教程：C++ CV_READ_SEQ_ELEM函数代码示例

void drawSquares(IplImage* img, CvSeq* squares, PointMatrix &mat){        CvSeqReader reader;        IplImage* cpy = cvCloneImage(img);        cvStartReadSeq(squares, &reader, 0);        for (int i = 0; i < squares->total; i++) {                CvPoint pt[4], *rect = pt;                int count = 4;                CV_READ_SEQ_ELEM(pt[0], reader);                CV_READ_SEQ_ELEM(pt[1], reader);                CV_READ_SEQ_ELEM(pt[2], reader);                CV_READ_SEQ_ELEM(pt[3], reader);                cvLine(cpy, pt[0], pt[2], CV_RGB(0, 0, 0), 1);                cvLine(cpy, pt[1], pt[3], CV_RGB(255, 255, 0), 1);                MyCvPoint myCvPoint( (pt[0].x + pt[2].x) /2, (pt[1].y + pt[2].y)/2, img->width, img->height);                mat.AddMem(myCvPoint);                cvPolyLine(cpy, &rect, &count, 1, 1, CV_RGB(0, 255, 255), 1, 8, 0);        }       // cvShowImage("After Modify", cpy);        cvReleaseImage(&cpy);}

void EyeTracker::drawSquares(CvSeq* squares){	CvSeqReader reader;	int i;	// initialize reader of the sequence	cvStartReadSeq(squares, &reader, 0);	CvPoint pt[4];	CvPoint* rect;	// read 4 sequence elements at a time (all vertices of a square)	for(i = 0; i < squares->total; i += 4)	{		rect = pt;		int count = 4;		// read 4 vertices		CV_READ_SEQ_ELEM(pt[0], reader);		CV_READ_SEQ_ELEM(pt[1], reader);		CV_READ_SEQ_ELEM(pt[2], reader);		CV_READ_SEQ_ELEM(pt[3], reader);		cvPolyLine(graySceneImagePts, &rect, &count, 1, 1, CV_RGB(255, 255, 255), 3, CV_AA, 0);	}	CvFont font;	cvInitFont(&font, CV_FONT_HERSHEY_SIMPLEX | CV_FONT_ITALIC, 1.0, 1.0, 0, 1);	char s[20];	sprintf(s, "Threshold = %d", squareThreshold);	cvPutText(graySceneImagePts, s, cvPoint(30, 30), &font, cvScalar(255, 255, 0));}

voidBlob::copy_edges(const CvSeq* _edges){  CV_FUNCNAME( "Blob::copy_edges" );  __BEGIN__;	cvClearSeq(this->edges_);    //- copy the given sequence	CvSeqReader seq_reader;	CvSeqWriter seq_writer;	CvPoint current_edge;  int i;	CV_CALL( cvStartReadSeq( _edges, &seq_reader) );	CV_CALL( cvStartAppendToSeq( this->edges_, &seq_writer ) );	for( i = 0; i < _edges->total; i++)	{		CV_READ_SEQ_ELEM ( current_edge , seq_reader);		CV_WRITE_SEQ_ELEM( current_edge , seq_writer );	}	CV_CALL( cvEndWriteSeq( &seq_writer ) );  __END__;  __ISL_CHECK_ERROR__;}

double BlobGetMaxYatMinX::operator()(Blob &blob){	double result = LONG_MIN;	CvSeqReader reader;	CvPoint actualPoint;	BlobContour::t_PointList externContour;	externContour = blob.GetExternalContour()->GetContourPoints();	if( !externContour ) return result;	cvStartReadSeq( externContour, &reader);	for( int i=0; i< externContour->total; i++)	{		CV_READ_SEQ_ELEM( actualPoint, reader);		if( (actualPoint.x == blob.MinX()) && (actualPoint.y > result) )		{			result = actualPoint.y;		}	}	return result;}

    virtual void operator()(const cv::BlockedRange& range) const    {#ifdef HAVE_TBB        tbb::spin_mutex::scoped_lock lock;#endif        CvSeqReader reader;        int begin = range.begin();        int end = range.end();        int weak_count = end - begin;        CvDTree* tree;        for (int i=0; i<k; ++i)        {            float tmp_sum = 0.0f;            if ((weak[i]) && (weak_count))            {                cvStartReadSeq( weak[i], &reader );                cvSetSeqReaderPos( &reader, begin );                for (int j=0; j<weak_count; ++j)                {                    CV_READ_SEQ_ELEM( tree, reader );                    tmp_sum += shrinkage*(float)(tree->predict(sample, missing)->value);                }            }#ifdef HAVE_TBB            lock.acquire(SumMutex);            sum[i] += tmp_sum;            lock.release();#else            sum[i] += tmp_sum;#endif        }    } // Tree_predictor::operator()

std::vector<CvPoint>maskFromTemplate (const std::vector<cv::linemod::Template>& templates,                  int num_modalities,                  cv::Point offset,                  cv::Size size,                  cv::Mat& mask,                  cv::Mat& dst){  templateConvexHull (templates, num_modalities, offset, size, mask);  const int OFFSET = 30;  cv::dilate (mask, mask, cv::Mat (), cv::Point (-1, -1), OFFSET);  CvMemStorage * lp_storage = cvCreateMemStorage (0);  CvTreeNodeIterator l_iterator;  CvSeqReader l_reader;  CvSeq * lp_contour = 0;  cv::Mat mask_copy = mask.clone ();  IplImage mask_copy_ipl = mask_copy;  cvFindContours (&mask_copy_ipl, lp_storage, &lp_contour, sizeof(CvContour), CV_RETR_CCOMP, CV_CHAIN_APPROX_SIMPLE);  std::vector<CvPoint> l_pts1;  // to use as input to cv_primesensor::filter_plane  cvInitTreeNodeIterator (&l_iterator, lp_contour, 1);  while ( (lp_contour = (CvSeq *) cvNextTreeNode (&l_iterator)) != 0)  {    CvPoint l_pt0;    cvStartReadSeq (lp_contour, &l_reader, 0);    CV_READ_SEQ_ELEM(l_pt0, l_reader);    l_pts1.push_back (l_pt0);    for (int i = 0; i < lp_contour->total; ++i)    {      CvPoint l_pt1;      CV_READ_SEQ_ELEM(l_pt1, l_reader);      /// @todo Really need dst at all? Can just as well do this outside      cv::line (dst, l_pt0, l_pt1, CV_RGB(0, 255, 0), 2);      l_pt0 = l_pt1;      l_pts1.push_back (l_pt0);    }  }  cvReleaseMemStorage (&lp_storage);  return l_pts1;}

/**- FUNCTION: FillBlob- FUNCTIONALITY: 	- Fills the blob with a specified colour- PARAMETERS:	- imatge: where to paint	- color: colour to paint the blob- RESULT:	- modifies input image and returns the seed point used to fill the blob- RESTRICTIONS:- AUTHOR: Ricard Borr
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