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Viewing changes to sw/ext/opencv_bebop/opencv/samples/python/houghcircles.py

  • Committer: Paparazzi buildbot
  • Date: 2016-05-18 15:00:29 UTC
  • Revision ID: felix.ruess+docbot@gmail.com-20160518150029-e8lgzi5kvb4p7un9
Manual import commit 4b8bbb730080dac23cf816b98908dacfabe2a8ec from v5.0 branch.

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sw/ext/opencv_bebop/opencv/samples/python/houghcircles.py
 
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#!/usr/bin/python
 
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'''
 
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This example illustrates how to use cv2.HoughCircles() function.
 
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Usage:
 
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    houghcircles.py [<image_name>]
 
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    image argument defaults to ../data/board.jpg
 
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'''
 
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# Python 2/3 compatibility
 
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from __future__ import print_function
 
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import cv2
 
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import numpy as np
 
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import sys
 
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if __name__ == '__main__':
 
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    print(__doc__)
 
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    try:
 
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        fn = sys.argv[1]
 
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    except IndexError:
 
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        fn = "../data/board.jpg"
 
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    src = cv2.imread(fn, 1)
 
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    img = cv2.cvtColor(src, cv2.COLOR_BGR2GRAY)
 
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    img = cv2.medianBlur(img, 5)
 
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    cimg = src.copy() # numpy function
 
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    circles = cv2.HoughCircles(img, cv2.HOUGH_GRADIENT, 1, 10, np.array([]), 100, 30, 1, 30)
 
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    a, b, c = circles.shape
 
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    for i in range(b):
 
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        cv2.circle(cimg, (circles[0][i][0], circles[0][i][1]), circles[0][i][2], (0, 0, 255), 3, cv2.LINE_AA)
 
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        cv2.circle(cimg, (circles[0][i][0], circles[0][i][1]), 2, (0, 255, 0), 3, cv2.LINE_AA)  # draw center of circle
 
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    cv2.imshow("source", src)
 
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    cv2.imshow("detected circles", cimg)
 
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    cv2.waitKey(0)