+++ /dev/null
-#! /usr/bin/env python
-
-print "OpenCV Python version of contours"
-
-# import the necessary things for OpenCV
-from opencv import cv
-from opencv import highgui
-
-# some default constants
-_SIZE = 500
-_DEFAULT_LEVEL = 3
-
-# definition of some colors
-_red = cv.cvScalar (0, 0, 255, 0);
-_green = cv.cvScalar (0, 255, 0, 0);
-_white = cv.cvRealScalar (255)
-_black = cv.cvRealScalar (0)
-
-# the callback on the trackbar, to set the level of contours we want
-# to display
-def on_trackbar (position):
-
- # create the image for putting in it the founded contours
- contours_image = cv.cvCreateImage (cv.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
-
- # first, clear the image where we will draw contours
- cv.cvSetZero (contours_image)
-
- # draw contours in red and green
- cv.cvDrawContours (contours_image, _contours,
- _red, _green,
- levels, 3, cv.CV_AA,
- cv.cvPoint (0, 0))
-
- # finally, show the image
- highgui.cvShowImage ("contours", contours_image)
-
-if __name__ == '__main__':
-
- # create the image where we want to display results
- image = cv.cvCreateImage (cv.cvSize (_SIZE, _SIZE), 8, 1)
-
- # start with an empty image
- cv.cvSetZero (image)
-
- # draw the original picture
- for i in range (6):
- dx = (i % 2) * 250 - 30
- dy = (i / 2) * 150
-
- cv.cvEllipse (image,
- cv.cvPoint (dx + 150, dy + 100),
- cv.cvSize (100, 70),
- 0, 0, 360, _white, -1, 8, 0)
- cv.cvEllipse (image,
- cv.cvPoint (dx + 115, dy + 70),
- cv.cvSize (30, 20),
- 0, 0, 360, _black, -1, 8, 0)
- cv.cvEllipse (image,
- cv.cvPoint (dx + 185, dy + 70),
- cv.cvSize (30, 20),
- 0, 0, 360, _black, -1, 8, 0)
- cv.cvEllipse (image,
- cv.cvPoint (dx + 115, dy + 70),
- cv.cvSize (15, 15),
- 0, 0, 360, _white, -1, 8, 0)
- cv.cvEllipse (image,
- cv.cvPoint (dx + 185, dy + 70),
- cv.cvSize (15, 15),
- 0, 0, 360, _white, -1, 8, 0)
- cv.cvEllipse (image,
- cv.cvPoint (dx + 115, dy + 70),
- cv.cvSize (5, 5),
- 0, 0, 360, _black, -1, 8, 0)
- cv.cvEllipse (image,
- cv.cvPoint (dx + 185, dy + 70),
- cv.cvSize (5, 5),
- 0, 0, 360, _black, -1, 8, 0)
- cv.cvEllipse (image,
- cv.cvPoint (dx + 150, dy + 100),
- cv.cvSize (10, 5),
- 0, 0, 360, _black, -1, 8, 0)
- cv.cvEllipse (image,
- cv.cvPoint (dx + 150, dy + 150),
- cv.cvSize (40, 10),
- 0, 0, 360, _black, -1, 8, 0)
- cv.cvEllipse (image,
- cv.cvPoint (dx + 27, dy + 100),
- cv.cvSize (20, 35),
- 0, 0, 360, _white, -1, 8, 0)
- cv.cvEllipse (image,
- cv.cvPoint (dx + 273, dy + 100),
- cv.cvSize (20, 35),
- 0, 0, 360, _white, -1, 8, 0)
-
- # create window and display the original picture in it
- highgui.cvNamedWindow ("image", 1)
- highgui.cvShowImage ("image", image)
-
- # create the storage area
- storage = cv.cvCreateMemStorage (0)
-
- # find the contours
- nb_contours, contours = cv.cvFindContours (image,
- storage,
- cv.sizeof_CvContour,
- cv.CV_RETR_TREE,
- cv.CV_CHAIN_APPROX_SIMPLE,
- cv.cvPoint (0,0))
-
- # comment this out if you do not want approximation
- contours = cv.cvApproxPoly (contours, cv.sizeof_CvContour,
- storage,
- cv.CV_POLY_APPROX_DP, 3, 1)
-
- # create the window for the contours
- highgui.cvNamedWindow ("contours", 1)
-
- # create the trackbar, to enable the change of the displayed level
- highgui.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
- highgui.cvWaitKey (0)
projects / opencv / blobdiff