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谁给转换下 CvSeq* findSquares4( IplImage* img, CvMemStorage* storage ,int minarea, int maxarea, int minangle, int maxangle) { CvSeq* contours;//边缘 int N = 6; //阈值分级 CvSize sz = cvSize( img->width & -2, img->height & -2 ); IplImage* timg = cvCloneImage( img );//拷贝一次img IplImage* gray = cvCreateImage( sz, 8, 1 ); //img灰度图 IplImage* pyr = cvCreateImage( cvSize(sz.width/2, sz.height/2), 8, 3 ); //金字塔滤波3通道图像中间变量 IplImage* tgray = cvCreateImage( sz, 8, 1 ); ; CvSeq* result; double s, t; CvSeq* squares = cvCreateSeq( 0, sizeof(CvSeq), sizeof(CvPoint), storage ); cvSetImageROI( timg, cvRect( 0, 0, sz.width, sz.height )); //金字塔滤波 cvPyrDown( timg, pyr, 7 ); cvPyrUp( pyr, timg, 7 ); //在3个通道中寻找矩形 for( int c = 0; c < 3; c++ ) //对3个通道分别进行处理 { cvSetImageCOI( timg, c+1 ); cvCopy( timg, tgray, 0 ); //依次将BGR通道送入tgray for( int l = 0; l < N; l++ ) { //不同阈值下二值化 cvThreshold( tgray, gray, (l+1)*255/N, 255, CV_THRESH_BINARY ); cvFindContours( gray, storage, &contours, sizeof(CvContour),CV_RETR_LIST, CV_CHAIN_APPROX_SIMPLE, cvPoint(0,0) ); while( contours ) { //多边形逼近 result = cvApproxPoly( contours, sizeof(CvContour), storage,CV_POLY_APPROX_DP, cvContourPerimeter(contours)*0.02, 0 ); //如果是凸四边形并且面积在范围内 if( result->total == 4 && fabs(cvContourArea(result,CV_WHOLE_SEQ)) > minarea && fabs(cvContourArea(result,CV_WHOLE_SEQ)) < maxarea && cvCheckContourConvexity(result) ) { s = 0; //判断每一条边 for( int i = 0; i < 5; i++ ) { if( i >= 2 ) { //角度 t = fabs(angle( (CvPoint*)cvGetSeqElem( result, i ),(CvPoint*)cvGetSeqElem( result, i-2 ), (CvPoint*)cvGetSeqElem( result, i-1 ))); s = s > t ? s : t; } } //这里的S为直角判定条件 单位为角度 if( s > minangle && s < maxangle ) for( int i = 0; i < 4; i++ ) cvSeqPush( squares,(CvPoint*)cvGetSeqElem( result, i )); } contours = contours->h_next; } } } cvReleaseImage( &gray ); cvReleaseImage( &pyr ); cvReleaseImage( &tgray ); cvReleaseImage( &timg ); return squares; }
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