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127 lines
3.5 KiB
C++
127 lines
3.5 KiB
C++
/********************************************************************************
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*
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*
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* This program is demonstration for ellipse fitting. Program finds
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* contours and approximate it by ellipses.
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*
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* Trackbar specify threshold parametr.
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*
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* White lines is contours. Red lines is fitting ellipses.
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*
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*
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* Autor: Denis Burenkov.
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*
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*
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*
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********************************************************************************/
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#include "opencv2/imgproc/imgproc_c.h"
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#include "opencv2/highgui/highgui.hpp"
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int slider_pos = 70;
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// Load the source image. HighGUI use.
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IplImage *image02 = 0, *image03 = 0, *image04 = 0;
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void process_image(int h);
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int main( int argc, char** argv )
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{
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const char* filename = argc == 2 ? argv[1] : (char*)"stuff.jpg";
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// load image and force it to be grayscale
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if( (image03 = cvLoadImage(filename, 0)) == 0 )
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return -1;
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// Create the destination images
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image02 = cvCloneImage( image03 );
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image04 = cvCloneImage( image03 );
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// Create windows.
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cvNamedWindow("Source", 1);
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cvNamedWindow("Result", 1);
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// Show the image.
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cvShowImage("Source", image03);
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// Create toolbars. HighGUI use.
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cvCreateTrackbar( "Threshold", "Result", &slider_pos, 255, process_image );
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process_image(0);
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// Wait for a key stroke; the same function arranges events processing
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cvWaitKey(0);
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cvReleaseImage(&image02);
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cvReleaseImage(&image03);
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cvDestroyWindow("Source");
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cvDestroyWindow("Result");
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return 0;
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}
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// Define trackbar callback functon. This function find contours,
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// draw it and approximate it by ellipses.
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void process_image(int h)
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{
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CvMemStorage* storage;
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CvSeq* contour;
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// Create dynamic structure and sequence.
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storage = cvCreateMemStorage(0);
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contour = cvCreateSeq(CV_SEQ_ELTYPE_POINT, sizeof(CvSeq), sizeof(CvPoint) , storage);
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// Threshold the source image. This needful for cvFindContours().
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cvThreshold( image03, image02, slider_pos, 255, CV_THRESH_BINARY );
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// Find all contours.
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cvFindContours( image02, storage, &contour, sizeof(CvContour),
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CV_RETR_LIST, CV_CHAIN_APPROX_NONE, cvPoint(0,0));
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// Clear images. IPL use.
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cvZero(image02);
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cvZero(image04);
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// This cycle draw all contours and approximate it by ellipses.
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for(;contour;contour = contour->h_next)
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{
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int count = contour->total; // This is number point in contour
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CvPoint center;
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CvSize size;
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CvBox2D box;
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// Number point must be more than or equal to 6 (for cvFitEllipse_32f).
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if( count < 6 )
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continue;
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CvMat* points_f = cvCreateMat( 1, count, CV_32FC2 );
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CvMat points_i = cvMat( 1, count, CV_32SC2, points_f->data.ptr );
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cvCvtSeqToArray( contour, points_f->data.ptr, CV_WHOLE_SEQ );
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cvConvert( &points_i, points_f );
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// Fits ellipse to current contour.
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box = cvFitEllipse2( points_f );
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// Draw current contour.
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cvDrawContours(image04,contour,CV_RGB(255,255,255),CV_RGB(255,255,255),0,1,8,cvPoint(0,0));
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// Convert ellipse data from float to integer representation.
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center = cvPointFrom32f(box.center);
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size.width = cvRound(box.size.width*0.5);
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size.height = cvRound(box.size.height*0.5);
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// Draw ellipse.
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cvEllipse(image04, center, size,
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-box.angle, 0, 360,
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CV_RGB(0,0,255), 1, CV_AA, 0);
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cvReleaseMat(&points_f);
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}
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// Show image. HighGUI use.
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cvShowImage( "Result", image04 );
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}
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#ifdef _EiC
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main(1,"fitellipse.c");
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#endif
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