morphology python sample

samples/python2/common.py

@@ -54,3 +54,6 @@ def mtx2rvec(R):
     axis = np.cross(vt[0], vt[1])
     return axis * np.arctan2(s, c)
 
+def draw_str(dst, (x, y), s):
+    cv2.putText(dst, s, (x+1, y+1), cv2.FONT_HERSHEY_PLAIN, 1.0, (0, 0, 0), thickness = 2, linetype=cv2.CV_AA)
+    cv2.putText(dst, s, (x, y), cv2.FONT_HERSHEY_PLAIN, 1.0, (255, 255, 255), linetype=cv2.CV_AA)

samples/python2/morphology.py

@@ -1,19 +1,58 @@
 import numpy as np
 import cv2
 
-img = cv2.imread('../cpp/baboon.jpg', False)
 
-def callback(k):
+if __name__ == '__main__':
-    k = 2*(k-10)
+    import sys
-    st = cv2.getStructuringElement(cv2.MORPH_ELLIPSE, (abs(k), abs(k)))
+    from itertools import cycle
-    op = cv2.MORPH_BLACKHAT
+    from common import draw_str
-    if k > 0:
-        op = cv2.MORPH_TOPHAT
-    res = cv2.morphologyEx(img, op, st)
-    cv2.imshow('img', res)
 
-callback(20)
+    try: fn = sys.argv[1]
-cv2.createTrackbar('k', 'img', 10, 20, callback)
+    except: fn = '../cpp/baboon.jpg'
+    img = cv2.imread(fn)
 
+    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()
 
-cv2.waitKey()
+    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()
+    print "Controls:"
+    print "  1 - change operation"
+    print "  2 - change structure element shape"
+    print
+    while True:
+        ch = 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()