86 lines
2.4 KiB
Matlab
86 lines
2.4 KiB
Matlab
#! /usr/bin/env octave
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cv;
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highgui;
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function ret = randint(a, b)
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ret = int32(rand() * (b - a) + a);
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endfunction
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function minarea_array(img, count)
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global cv;
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global highgui;
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pointMat = cvCreateMat( count, 1, cv.CV_32SC2 );
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for i=0:count-1,
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pointMat(i) = cvPoint( randint(img.width/4, img.width*3/4), randint(img.height/4, img.height*3/4) );
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endfor
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box = cvMinAreaRect2( pointMat );
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box_vtx = cvBoxPoints( box );
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[success, center, radius] = cvMinEnclosingCircle( pointMat );
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cv.cvZero( img );
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for i=0:count-1,
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cvCircle( img, cvGet1D(pointMat,i), 2, CV_RGB( 255, 0, 0 ), \
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cv.CV_FILLED, cv.CV_AA, 0 );
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endfor
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box_vtx = {cvPointFrom32f(box_vtx{1}), \
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cvPointFrom32f(box_vtx{2}), \
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cvPointFrom32f(box_vtx{3}), \
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cvPointFrom32f(box_vtx{4})};
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cvCircle( img, cvPointFrom32f(center), cvRound(radius), CV_RGB(255, 255, 0), 1, cv.CV_AA, 0 );
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cvPolyLine( img, {box_vtx}, 1, CV_RGB(0,255,255), 1, cv.CV_AA ) ;
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endfunction
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function minarea_seq(img, count, storage)
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global cv;
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global highgui;
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ptseq = cvCreateSeq( bitor(cv.CV_SEQ_KIND_GENERIC, cv.CV_32SC2), cv.sizeof_CvContour, cv.sizeof_CvPoint, storage );
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ptseq = cv.CvSeq_CvPoint.cast( ptseq );
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for i=0:count-1,
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pt0 = cvPoint( randint(img.width/4, img.width*3/4), randint(img.height/4, img.height*3/4) );
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cvSeqPush( ptseq, pt0 );
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endfor
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box = cvMinAreaRect2( ptseq );
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box_vtx = cvBoxPoints( box );
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[success, center, radius] = cvMinEnclosingCircle( ptseq );
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cv.cvZero( img );
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for pt = CvSeq_map(ptseq),
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pt = pt{1};
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cvCircle( img, pt, 2, CV_RGB( 255, 0, 0 ), cv.CV_FILLED, cv.CV_AA, 0 );
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endfor
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box_vtx = {cvPointFrom32f(box_vtx{1}), \
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cvPointFrom32f(box_vtx{2}), \
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cvPointFrom32f(box_vtx{3}), \
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cvPointFrom32f(box_vtx{4})};
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cvCircle( img, cvPointFrom32f(center), cvRound(radius), CV_RGB(255, 255, 0), 1, cv.CV_AA, 0 );
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cvPolyLine( img, {box_vtx}, 1, CV_RGB(0,255,255), 1, cv.CV_AA );
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cvClearMemStorage( storage );
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endfunction
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img = cvCreateImage( cvSize( 500, 500 ), 8, 3 );
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storage = cvCreateMemStorage(0);
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cvNamedWindow( "rect & circle", 1 );
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use_seq=false;
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while (true),
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count = randint(1,100);
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if (use_seq)
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minarea_seq(img, count, storage);
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else
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minarea_array(img, count);
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endif
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cvShowImage("rect & circle", img);
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key = cvWaitKey();
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if( key == '\x1b' );
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break;
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endif
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use_seq = !use_seq;
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endwhile
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