mirror of
https://github.com/opencv/opencv.git
synced 2024-11-27 20:50:25 +08:00
75 lines
2.4 KiB
Python
Executable File
75 lines
2.4 KiB
Python
Executable File
#!/usr/bin/env python
|
|
|
|
'''
|
|
This program illustrates the use of findContours and drawContours.
|
|
The original image is put up along with the image of drawn contours.
|
|
|
|
Usage:
|
|
contours.py
|
|
A trackbar is put up which controls the contour level from -3 to 3
|
|
'''
|
|
|
|
# Python 2/3 compatibility
|
|
from __future__ import print_function
|
|
import sys
|
|
PY3 = sys.version_info[0] == 3
|
|
|
|
if PY3:
|
|
xrange = range
|
|
|
|
import numpy as np
|
|
import cv2 as cv
|
|
|
|
def make_image():
|
|
img = np.zeros((500, 500), np.uint8)
|
|
black, white = 0, 255
|
|
for i in xrange(6):
|
|
dx = int((i%2)*250 - 30)
|
|
dy = int((i/2.)*150)
|
|
|
|
if i == 0:
|
|
for j in xrange(11):
|
|
angle = (j+5)*np.pi/21
|
|
c, s = np.cos(angle), np.sin(angle)
|
|
x1, y1 = np.int32([dx+100+j*10-80*c, dy+100-90*s])
|
|
x2, y2 = np.int32([dx+100+j*10-30*c, dy+100-30*s])
|
|
cv.line(img, (x1, y1), (x2, y2), white)
|
|
|
|
cv.ellipse( img, (dx+150, dy+100), (100,70), 0, 0, 360, white, -1 )
|
|
cv.ellipse( img, (dx+115, dy+70), (30,20), 0, 0, 360, black, -1 )
|
|
cv.ellipse( img, (dx+185, dy+70), (30,20), 0, 0, 360, black, -1 )
|
|
cv.ellipse( img, (dx+115, dy+70), (15,15), 0, 0, 360, white, -1 )
|
|
cv.ellipse( img, (dx+185, dy+70), (15,15), 0, 0, 360, white, -1 )
|
|
cv.ellipse( img, (dx+115, dy+70), (5,5), 0, 0, 360, black, -1 )
|
|
cv.ellipse( img, (dx+185, dy+70), (5,5), 0, 0, 360, black, -1 )
|
|
cv.ellipse( img, (dx+150, dy+100), (10,5), 0, 0, 360, black, -1 )
|
|
cv.ellipse( img, (dx+150, dy+150), (40,10), 0, 0, 360, black, -1 )
|
|
cv.ellipse( img, (dx+27, dy+100), (20,35), 0, 0, 360, white, -1 )
|
|
cv.ellipse( img, (dx+273, dy+100), (20,35), 0, 0, 360, white, -1 )
|
|
return img
|
|
|
|
def main():
|
|
img = make_image()
|
|
h, w = img.shape[:2]
|
|
|
|
contours0, hierarchy = cv.findContours( img.copy(), cv.RETR_TREE, cv.CHAIN_APPROX_SIMPLE)
|
|
contours = [cv.approxPolyDP(cnt, 3, True) for cnt in contours0]
|
|
|
|
def update(levels):
|
|
vis = np.zeros((h, w, 3), np.uint8)
|
|
levels = levels - 3
|
|
cv.drawContours( vis, contours, (-1, 2)[levels <= 0], (128,255,255),
|
|
3, cv.LINE_AA, hierarchy, abs(levels) )
|
|
cv.imshow('contours', vis)
|
|
update(3)
|
|
cv.createTrackbar( "levels+3", "contours", 3, 7, update )
|
|
cv.imshow('image', img)
|
|
cv.waitKey()
|
|
print('Done')
|
|
|
|
|
|
if __name__ == '__main__':
|
|
print(__doc__)
|
|
main()
|
|
cv.destroyAllWindows()
|