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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
'''
# Python 2/3 compatibility
from __future__ import print_function
import sys
PY3 = sys.version_info[0] == 3
import numpy as np
import cv2 as cv
def main():
import sys
from itertools import cycle
from common import draw_str
try:
fn = sys.argv[1]
except:
fn = 'baboon.jpg'
img = cv.imread(cv.samples.findFile(fn))
if img is None:
print('Failed to load image file:', fn)
sys.exit(1)
cv.imshow('original', img)
modes = cycle(['erode/dilate', 'open/close', 'blackhat/tophat', 'gradient'])
str_modes = cycle(['ellipse', 'rect', 'cross'])
if PY3:
cur_mode = next(modes)
cur_str_mode = next(str_modes)
else:
cur_mode = modes.next()
cur_str_mode = str_modes.next()
def update(dummy=None):
try: # do not get trackbar position while trackbar is not created
sz = cv.getTrackbarPos('op/size', 'morphology')
iters = cv.getTrackbarPos('iters', 'morphology')
except:
return
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 = cv.getStructuringElement(getattr(cv, str_name), (sz, sz))
res = cv.morphologyEx(img, getattr(cv, 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))
cv.imshow('morphology', res)
cv.namedWindow('morphology')
cv.createTrackbar('op/size', 'morphology', 12, 20, update)
cv.createTrackbar('iters', 'morphology', 1, 10, update)
update()
while True:
ch = cv.waitKey()
if ch == 27:
break
if ch == ord('1'):
if PY3:
cur_mode = next(modes)
else:
cur_mode = modes.next()
if ch == ord('2'):
if PY3:
cur_str_mode = next(str_modes)
else:
cur_str_mode = str_modes.next()
update()
print('Done')
if __name__ == '__main__':
print(__doc__)
main()
cv.destroyAllWindows()
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