mirror of
https://github.com/opencv/opencv.git
synced 2024-12-05 09:49:12 +08:00
136 lines
4.2 KiB
Python
Executable File
136 lines
4.2 KiB
Python
Executable File
#! /usr/bin/env python
|
|
|
|
print "OpenCV Python version of contours"
|
|
|
|
# import the necessary things for OpenCV
|
|
import cv2.cv as cv
|
|
|
|
# some default constants
|
|
_SIZE = 500
|
|
_DEFAULT_LEVEL = 3
|
|
|
|
# definition of some colors
|
|
_red = (0, 0, 255, 0);
|
|
_green = (0, 255, 0, 0);
|
|
_white = cv.RealScalar (255)
|
|
_black = cv.RealScalar (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.CreateImage ( (_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.SetZero (contours_image)
|
|
|
|
# draw contours in red and green
|
|
cv.DrawContours (contours_image, _contours,
|
|
_red, _green,
|
|
levels, 3, cv.CV_AA,
|
|
(0, 0))
|
|
|
|
# finally, show the image
|
|
cv.ShowImage ("contours", contours_image)
|
|
|
|
if __name__ == '__main__':
|
|
|
|
# create the image where we want to display results
|
|
image = cv.CreateImage ( (_SIZE, _SIZE), 8, 1)
|
|
|
|
# start with an empty image
|
|
cv.SetZero (image)
|
|
|
|
# draw the original picture
|
|
for i in range (6):
|
|
dx = (i % 2) * 250 - 30
|
|
dy = (i / 2) * 150
|
|
|
|
cv.Ellipse (image,
|
|
(dx + 150, dy + 100),
|
|
(100, 70),
|
|
0, 0, 360, _white, -1, 8, 0)
|
|
cv.Ellipse (image,
|
|
(dx + 115, dy + 70),
|
|
(30, 20),
|
|
0, 0, 360, _black, -1, 8, 0)
|
|
cv.Ellipse (image,
|
|
(dx + 185, dy + 70),
|
|
(30, 20),
|
|
0, 0, 360, _black, -1, 8, 0)
|
|
cv.Ellipse (image,
|
|
(dx + 115, dy + 70),
|
|
(15, 15),
|
|
0, 0, 360, _white, -1, 8, 0)
|
|
cv.Ellipse (image,
|
|
(dx + 185, dy + 70),
|
|
(15, 15),
|
|
0, 0, 360, _white, -1, 8, 0)
|
|
cv.Ellipse (image,
|
|
(dx + 115, dy + 70),
|
|
(5, 5),
|
|
0, 0, 360, _black, -1, 8, 0)
|
|
cv.Ellipse (image,
|
|
(dx + 185, dy + 70),
|
|
(5, 5),
|
|
0, 0, 360, _black, -1, 8, 0)
|
|
cv.Ellipse (image,
|
|
(dx + 150, dy + 100),
|
|
(10, 5),
|
|
0, 0, 360, _black, -1, 8, 0)
|
|
cv.Ellipse (image,
|
|
(dx + 150, dy + 150),
|
|
(40, 10),
|
|
0, 0, 360, _black, -1, 8, 0)
|
|
cv.Ellipse (image,
|
|
(dx + 27, dy + 100),
|
|
(20, 35),
|
|
0, 0, 360, _white, -1, 8, 0)
|
|
cv.Ellipse (image,
|
|
(dx + 273, dy + 100),
|
|
(20, 35),
|
|
0, 0, 360, _white, -1, 8, 0)
|
|
|
|
# create window and display the original picture in it
|
|
cv.NamedWindow ("image", 1)
|
|
cv.ShowImage ("image", image)
|
|
|
|
# create the storage area
|
|
storage = cv.CreateMemStorage (0)
|
|
|
|
# find the contours
|
|
contours = cv.FindContours(image,
|
|
storage,
|
|
cv.CV_RETR_TREE,
|
|
cv.CV_CHAIN_APPROX_SIMPLE,
|
|
(0,0))
|
|
|
|
# comment this out if you do not want approximation
|
|
contours = cv.ApproxPoly (contours,
|
|
storage,
|
|
cv.CV_POLY_APPROX_DP, 3, 1)
|
|
|
|
# create the window for the contours
|
|
cv.NamedWindow ("contours", 1)
|
|
|
|
# create the trackbar, to enable the change of the displayed level
|
|
cv.CreateTrackbar ("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
|
|
cv.WaitKey (0)
|