mirror of
https://github.com/opencv/opencv.git
synced 2024-11-25 19:50:38 +08:00
141 lines
3.9 KiB
Matlab
141 lines
3.9 KiB
Matlab
#! /usr/bin/env octave
|
|
|
|
printf("OpenCV Octave version of contours\n");
|
|
|
|
## import the necessary things for OpenCV
|
|
cv;
|
|
|
|
|
|
global _SIZE;
|
|
global _red;
|
|
global _green;
|
|
global _blue;
|
|
global contours;
|
|
|
|
## some default constants
|
|
_SIZE = 500;
|
|
_DEFAULT_LEVEL = 3;
|
|
|
|
## definition of some colors
|
|
_red = cvScalar (0, 0, 255, 0);
|
|
_green = cvScalar (0, 255, 0, 0);
|
|
_white = cvRealScalar (255);
|
|
_black = cvRealScalar (0);
|
|
|
|
## the callback on the trackbar, to set the level of contours we want
|
|
## to display
|
|
function on_trackbar (position)
|
|
global cv;
|
|
global _SIZE;
|
|
global _red;
|
|
global _green;
|
|
global _blue;
|
|
global contours;
|
|
|
|
## create the image for putting in it the founded contours
|
|
contours_image = cvCreateImage (cvSize (_SIZE, _SIZE), 8, 3);
|
|
|
|
## compute the real level of display, given the current position
|
|
levels = position - 3;
|
|
|
|
## initialisation
|
|
_contours = contours;
|
|
|
|
if (levels <= 0)
|
|
## zero or negative value
|
|
## => get to the nearest face to make it look more funny
|
|
_contours = contours.h_next.h_next.h_next;
|
|
endif
|
|
|
|
## first, clear the image where we will draw contours
|
|
cvSetZero (contours_image);
|
|
|
|
## draw contours in red and green
|
|
cvDrawContours (contours_image, _contours, _red, _green, levels, 3, cv.CV_AA, cvPoint (0, 0));
|
|
|
|
## finally, show the image
|
|
cvShowImage ("contours", contours_image);
|
|
endfunction
|
|
|
|
## create the image where we want to display results
|
|
image = cvCreateImage (cvSize (_SIZE, _SIZE), 8, 1);
|
|
|
|
## start with an empty image
|
|
cvSetZero (image);
|
|
|
|
## draw the original picture
|
|
for i=0:6-1,
|
|
dx = mod(i,2) * 250 - 30;
|
|
dy = (i / 2) * 150;
|
|
|
|
cvEllipse (image,
|
|
cvPoint (dx + 150, dy + 100),
|
|
cvSize (100, 70),
|
|
0, 0, 360, _white, -1, 8, 0);
|
|
cvEllipse (image,
|
|
cvPoint (dx + 115, dy + 70),
|
|
cvSize (30, 20),
|
|
0, 0, 360, _black, -1, 8, 0);
|
|
cvEllipse (image,
|
|
cvPoint (dx + 185, dy + 70),
|
|
cvSize (30, 20),
|
|
0, 0, 360, _black, -1, 8, 0);
|
|
cvEllipse (image,
|
|
cvPoint (dx + 115, dy + 70),
|
|
cvSize (15, 15),
|
|
0, 0, 360, _white, -1, 8, 0);
|
|
cvEllipse (image,
|
|
cvPoint (dx + 185, dy + 70),
|
|
cvSize (15, 15),
|
|
0, 0, 360, _white, -1, 8, 0);
|
|
cvEllipse (image,
|
|
cvPoint (dx + 115, dy + 70),
|
|
cvSize (5, 5),
|
|
0, 0, 360, _black, -1, 8, 0);
|
|
cvEllipse (image,
|
|
cvPoint (dx + 185, dy + 70),
|
|
cvSize (5, 5),
|
|
0, 0, 360, _black, -1, 8, 0);
|
|
cvEllipse (image,
|
|
cvPoint (dx + 150, dy + 100),
|
|
cvSize (10, 5),
|
|
0, 0, 360, _black, -1, 8, 0);
|
|
cvEllipse (image,
|
|
cvPoint (dx + 150, dy + 150),
|
|
cvSize (40, 10),
|
|
0, 0, 360, _black, -1, 8, 0);
|
|
cvEllipse (image,
|
|
cvPoint (dx + 27, dy + 100),
|
|
cvSize (20, 35),
|
|
0, 0, 360, _white, -1, 8, 0);
|
|
cvEllipse (image,
|
|
cvPoint (dx + 273, dy + 100),
|
|
cvSize (20, 35),
|
|
0, 0, 360, _white, -1, 8, 0);
|
|
endfor
|
|
|
|
## create window and display the original picture in it
|
|
cvNamedWindow ("image", 1);
|
|
cvShowImage ("image", image);
|
|
|
|
## create the storage area
|
|
storage = cvCreateMemStorage (0);
|
|
|
|
## find the contours
|
|
[nb_contours, contours] = cvFindContours (image, storage, sizeof_CvContour, CV_RETR_TREE, CV_CHAIN_APPROX_SIMPLE, cvPoint (0,0));
|
|
|
|
## comment this out if you do not want approximation
|
|
contours = cvApproxPoly (contours, sizeof_CvContour, storage, CV_POLY_APPROX_DP, 3, 1);
|
|
|
|
## create the window for the contours
|
|
cvNamedWindow ("contours", 1);
|
|
|
|
## create the trackbar, to enable the change of the displayed level
|
|
cvCreateTrackbar ("levels+3", "contours", 3, 7, @on_trackbar);
|
|
|
|
## call one time the callback, so we will have the 1st display done
|
|
on_trackbar (_DEFAULT_LEVEL);
|
|
|
|
## wait a key pressed to end
|
|
cvWaitKey (0);
|