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      1 #!/usr/bin/env python
      2 
      3 '''
      4 Morphology operations.
      5 
      6 Usage:
      7   morphology.py [<image>]
      8 
      9 Keys:
     10   1   - change operation
     11   2   - change structure element shape
     12   ESC - exit
     13 '''
     14 
     15 import numpy as np
     16 import cv2
     17 
     18 
     19 if __name__ == '__main__':
     20     print __doc__
     21 
     22     import sys
     23     from itertools import cycle
     24     from common import draw_str
     25 
     26     try:
     27         fn = sys.argv[1]
     28     except:
     29         fn = '../data/baboon.jpg'
     30 
     31     img = cv2.imread(fn)
     32 
     33     if img is None:
     34         print 'Failed to load image file:', fn
     35         sys.exit(1)
     36 
     37     cv2.imshow('original', img)
     38 
     39     modes = cycle(['erode/dilate', 'open/close', 'blackhat/tophat', 'gradient'])
     40     str_modes = cycle(['ellipse', 'rect', 'cross'])
     41     cur_mode = modes.next()
     42     cur_str_mode = str_modes.next()
     43 
     44     def update(dummy=None):
     45         sz = cv2.getTrackbarPos('op/size', 'morphology')
     46         iters = cv2.getTrackbarPos('iters', 'morphology')
     47         opers = cur_mode.split('/')
     48         if len(opers) > 1:
     49             sz = sz - 10
     50             op = opers[sz > 0]
     51             sz = abs(sz)
     52         else:
     53             op = opers[0]
     54         sz = sz*2+1
     55 
     56         str_name = 'MORPH_' + cur_str_mode.upper()
     57         oper_name = 'MORPH_' + op.upper()
     58         st = cv2.getStructuringElement(getattr(cv2, str_name), (sz, sz))
     59         res = cv2.morphologyEx(img, getattr(cv2, oper_name), st, iterations=iters)
     60 
     61         draw_str(res, (10, 20), 'mode: ' + cur_mode)
     62         draw_str(res, (10, 40), 'operation: ' + oper_name)
     63         draw_str(res, (10, 60), 'structure: ' + str_name)
     64         draw_str(res, (10, 80), 'ksize: %d  iters: %d' % (sz, iters))
     65         cv2.imshow('morphology', res)
     66 
     67     cv2.namedWindow('morphology')
     68     cv2.createTrackbar('op/size', 'morphology', 12, 20, update)
     69     cv2.createTrackbar('iters', 'morphology', 1, 10, update)
     70     update()
     71     while True:
     72         ch = 0xFF & cv2.waitKey()
     73         if ch == 27:
     74             break
     75         if ch == ord('1'):
     76             cur_mode = modes.next()
     77         if ch == ord('2'):
     78             cur_str_mode = str_modes.next()
     79         update()
     80     cv2.destroyAllWindows()
     81