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141 lines
3.9 KiB
Matlab
141 lines
3.9 KiB
Matlab
#! /usr/bin/env octave
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printf("OpenCV Octave version of contours\n");
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## import the necessary things for OpenCV
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cv;
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global _SIZE;
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global _red;
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global _green;
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global _blue;
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global contours;
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## some default constants
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_SIZE = 500;
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_DEFAULT_LEVEL = 3;
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## definition of some colors
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_red = cvScalar (0, 0, 255, 0);
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_green = cvScalar (0, 255, 0, 0);
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_white = cvRealScalar (255);
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_black = cvRealScalar (0);
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## the callback on the trackbar, to set the level of contours we want
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## to display
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function on_trackbar (position)
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global cv;
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global _SIZE;
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global _red;
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global _green;
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global _blue;
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global contours;
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## create the image for putting in it the founded contours
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contours_image = cvCreateImage (cvSize (_SIZE, _SIZE), 8, 3);
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## compute the real level of display, given the current position
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levels = position - 3;
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## initialisation
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_contours = contours;
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if (levels <= 0)
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## zero or negative value
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## => get to the nearest face to make it look more funny
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_contours = contours.h_next.h_next.h_next;
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endif
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## first, clear the image where we will draw contours
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cvSetZero (contours_image);
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## draw contours in red and green
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cvDrawContours (contours_image, _contours, _red, _green, levels, 3, cv.CV_AA, cvPoint (0, 0));
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## finally, show the image
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cvShowImage ("contours", contours_image);
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endfunction
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## create the image where we want to display results
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image = cvCreateImage (cvSize (_SIZE, _SIZE), 8, 1);
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## start with an empty image
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cvSetZero (image);
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## draw the original picture
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for i=0:6-1,
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dx = mod(i,2) * 250 - 30;
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dy = (i / 2) * 150;
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cvEllipse (image,
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cvPoint (dx + 150, dy + 100),
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cvSize (100, 70),
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0, 0, 360, _white, -1, 8, 0);
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cvEllipse (image,
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cvPoint (dx + 115, dy + 70),
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cvSize (30, 20),
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0, 0, 360, _black, -1, 8, 0);
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cvEllipse (image,
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cvPoint (dx + 185, dy + 70),
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cvSize (30, 20),
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0, 0, 360, _black, -1, 8, 0);
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cvEllipse (image,
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cvPoint (dx + 115, dy + 70),
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cvSize (15, 15),
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0, 0, 360, _white, -1, 8, 0);
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cvEllipse (image,
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cvPoint (dx + 185, dy + 70),
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cvSize (15, 15),
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0, 0, 360, _white, -1, 8, 0);
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cvEllipse (image,
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cvPoint (dx + 115, dy + 70),
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cvSize (5, 5),
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0, 0, 360, _black, -1, 8, 0);
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cvEllipse (image,
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cvPoint (dx + 185, dy + 70),
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cvSize (5, 5),
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0, 0, 360, _black, -1, 8, 0);
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cvEllipse (image,
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cvPoint (dx + 150, dy + 100),
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cvSize (10, 5),
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0, 0, 360, _black, -1, 8, 0);
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cvEllipse (image,
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cvPoint (dx + 150, dy + 150),
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cvSize (40, 10),
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0, 0, 360, _black, -1, 8, 0);
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cvEllipse (image,
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cvPoint (dx + 27, dy + 100),
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cvSize (20, 35),
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0, 0, 360, _white, -1, 8, 0);
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cvEllipse (image,
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cvPoint (dx + 273, dy + 100),
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cvSize (20, 35),
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0, 0, 360, _white, -1, 8, 0);
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endfor
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## create window and display the original picture in it
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cvNamedWindow ("image", 1);
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cvShowImage ("image", image);
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## create the storage area
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storage = cvCreateMemStorage (0);
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## find the contours
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[nb_contours, contours] = cvFindContours (image, storage, sizeof_CvContour, CV_RETR_TREE, CV_CHAIN_APPROX_SIMPLE, cvPoint (0,0));
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## comment this out if you do not want approximation
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contours = cvApproxPoly (contours, sizeof_CvContour, storage, CV_POLY_APPROX_DP, 3, 1);
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## create the window for the contours
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cvNamedWindow ("contours", 1);
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## create the trackbar, to enable the change of the displayed level
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cvCreateTrackbar ("levels+3", "contours", 3, 7, @on_trackbar);
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## call one time the callback, so we will have the 1st display done
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on_trackbar (_DEFAULT_LEVEL);
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## wait a key pressed to end
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cvWaitKey (0);
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