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#!/usr/bin/env python
'''
Morphology operations.
Usage:
morphology.py [<image>]
Keys:
1 - change operation
2 - change structure element shape
ESC - exit
'''
import numpy as np
import cv2
if __name__ == '__main__':
print __doc__
import sys
from itertools import cycle
from common import draw_str
try: fn = sys.argv[1]
except: fn = '../cpp/baboon.jpg'
img = cv2.imread(fn)
cv2.imshow('original', img)
modes = cycle(['erode/dilate', 'open/close', 'blackhat/tophat', 'gradient'])
str_modes = cycle(['ellipse', 'rect', 'cross'])
cur_mode = modes.next()
cur_str_mode = str_modes.next()
def update(dummy=None):
sz = cv2.getTrackbarPos('op/size', 'morphology')
iters = cv2.getTrackbarPos('iters', 'morphology')
opers = cur_mode.split('/')
if len(opers) > 1:
sz = sz - 10
op = opers[sz > 0]
sz = abs(sz)
else:
op = opers[0]
sz = sz*2+1
str_name = 'MORPH_' + cur_str_mode.upper()
oper_name = 'MORPH_' + op.upper()
st = cv2.getStructuringElement(getattr(cv2, str_name), (sz, sz))
res = cv2.morphologyEx(img, getattr(cv2, oper_name), st, iterations=iters)
draw_str(res, (10, 20), 'mode: ' + cur_mode)
draw_str(res, (10, 40), 'operation: ' + oper_name)
draw_str(res, (10, 60), 'structure: ' + str_name)
draw_str(res, (10, 80), 'ksize: %d iters: %d' % (sz, iters))
cv2.imshow('morphology', res)
cv2.namedWindow('morphology')
cv2.createTrackbar('op/size', 'morphology', 12, 20, update)
cv2.createTrackbar('iters', 'morphology', 1, 10, update)
update()
while True:
ch = 0xFF & cv2.waitKey()
if ch == 27:
break
if ch == ord('1'):
cur_mode = modes.next()
if ch == ord('2'):
cur_str_mode = str_modes.next()
update()
cv2.destroyAllWindows()
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