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morphology python sample
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@ -54,3 +54,6 @@ def mtx2rvec(R):
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axis = np.cross(vt[0], vt[1])
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return axis * np.arctan2(s, c)
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def draw_str(dst, (x, y), s):
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cv2.putText(dst, s, (x+1, y+1), cv2.FONT_HERSHEY_PLAIN, 1.0, (0, 0, 0), thickness = 2, linetype=cv2.CV_AA)
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cv2.putText(dst, s, (x, y), cv2.FONT_HERSHEY_PLAIN, 1.0, (255, 255, 255), linetype=cv2.CV_AA)
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@ -1,19 +1,58 @@
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import numpy as np
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import cv2
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img = cv2.imread('../cpp/baboon.jpg', False)
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def callback(k):
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k = 2*(k-10)
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st = cv2.getStructuringElement(cv2.MORPH_ELLIPSE, (abs(k), abs(k)))
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op = cv2.MORPH_BLACKHAT
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if k > 0:
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op = cv2.MORPH_TOPHAT
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res = cv2.morphologyEx(img, op, st)
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cv2.imshow('img', res)
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if __name__ == '__main__':
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import sys
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from itertools import cycle
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from common import draw_str
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callback(20)
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cv2.createTrackbar('k', 'img', 10, 20, callback)
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try: fn = sys.argv[1]
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except: fn = '../cpp/baboon.jpg'
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img = cv2.imread(fn)
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modes = cycle(['erode/dilate', 'open/close', 'blackhat/tophat', 'gradient'])
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str_modes = cycle(['ellipse', 'rect', 'cross'])
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cur_mode = modes.next()
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cur_str_mode = str_modes.next()
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cv2.waitKey()
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def update(dummy=None):
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sz = cv2.getTrackbarPos('op/size', 'morphology')
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iters = cv2.getTrackbarPos('iters', 'morphology')
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opers = cur_mode.split('/')
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if len(opers) > 1:
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sz = sz - 10
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op = opers[sz > 0]
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sz = abs(sz)
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else:
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op = opers[0]
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sz = sz*2+1
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str_name = 'MORPH_' + cur_str_mode.upper()
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oper_name = 'MORPH_' + op.upper()
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st = cv2.getStructuringElement(getattr(cv2, str_name), (sz, sz))
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res = cv2.morphologyEx(img, getattr(cv2, oper_name), st, iterations=iters)
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draw_str(res, (10, 20), 'mode: ' + cur_mode)
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draw_str(res, (10, 40), 'operation: ' + oper_name)
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draw_str(res, (10, 60), 'structure: ' + str_name)
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draw_str(res, (10, 80), 'ksize: %d iters: %d' % (sz, iters))
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cv2.imshow('morphology', res)
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cv2.namedWindow('morphology')
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cv2.createTrackbar('op/size', 'morphology', 12, 20, update)
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cv2.createTrackbar('iters', 'morphology', 1, 10, update)
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update()
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print "Controls:"
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print " 1 - change operation"
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print " 2 - change structure element shape"
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print
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while True:
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ch = cv2.waitKey()
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if ch == 27:
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break
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if ch == ord('1'):
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cur_mode = modes.next()
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if ch == ord('2'):
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cur_str_mode = str_modes.next()
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update()
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