mirror of
https://github.com/opencv/opencv.git
synced 2024-11-24 19:20:28 +08:00
66 lines
1.8 KiB
Python
Executable File
66 lines
1.8 KiB
Python
Executable File
#! /usr/bin/env python
|
|
|
|
print "OpenCV Python version of convexhull"
|
|
|
|
# import the necessary things for OpenCV
|
|
import cv2.cv as cv
|
|
|
|
# to generate random values
|
|
import random
|
|
|
|
# how many points we want at max
|
|
_MAX_POINTS = 100
|
|
|
|
if __name__ == '__main__':
|
|
|
|
# main object to get random values from
|
|
my_random = random.Random ()
|
|
|
|
# create the image where we want to display results
|
|
image = cv.CreateImage ( (500, 500), 8, 3)
|
|
|
|
# create the window to put the image in
|
|
cv.NamedWindow ('hull', cv.CV_WINDOW_AUTOSIZE)
|
|
|
|
while True:
|
|
# do forever
|
|
|
|
# get a random number of points
|
|
count = my_random.randrange (0, _MAX_POINTS) + 1
|
|
|
|
# initialisations
|
|
points = []
|
|
|
|
for i in range (count):
|
|
# generate a random point
|
|
points.append ( (
|
|
my_random.randrange (0, image.width / 2) + image.width / 4,
|
|
my_random.randrange (0, image.width / 2) + image.width / 4
|
|
))
|
|
|
|
# compute the convex hull
|
|
storage = cv.CreateMemStorage(0)
|
|
hull = cv.ConvexHull2 (points, storage, cv.CV_CLOCKWISE, 1)
|
|
|
|
# start with an empty image
|
|
cv.SetZero (image)
|
|
|
|
# draw all the points as circles in red
|
|
for i in range (count):
|
|
cv.Circle (image, points [i], 2,
|
|
(0, 0, 255, 0),
|
|
cv.CV_FILLED, cv.CV_AA, 0)
|
|
|
|
# Draw the convex hull as a closed polyline in green
|
|
cv.PolyLine(image, [hull], 1, cv.RGB(0,255,0), 1, cv.CV_AA)
|
|
|
|
# display the final image
|
|
cv.ShowImage ('hull', image)
|
|
|
|
# handle events, and wait a key pressed
|
|
k = cv.WaitKey (0) % 0x100
|
|
if k == 27:
|
|
# user has press the ESC key, so exit
|
|
break
|
|
cv.DestroyAllWindows()
|