initial commit

samples/python/morphology.py

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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):
+        sz = cv.getTrackbarPos('op/size', 'morphology')
+        iters = cv.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 = 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()