descriptions for watershed.py and video.py

samples/python2/fitline.py

@@ -63,6 +63,8 @@ def update(_=None):
     cv2.imshow('fit line', img)
 
 if __name__ == '__main__':
+    print __doc__
+
     cv2.namedWindow('fit line')
     cv2.createTrackbar('noise', 'fit line', 3, 50, update)
     cv2.createTrackbar('point n', 'fit line', 100, 500, update)

samples/python2/video.py

@@ -1,3 +1,32 @@
+'''
+Video capture sample.
+
+Sample shows how VideoCapture class can be used to acquire video
+frames from a camera of a movie file. Also the sample provides 
+an example of procedural video generation by an object, mimicking 
+the VideoCapture interface (see Chess class). 
+
+'create_capture' is a convinience function for capture creation, 
+falling back to procedural video in case of error.
+
+Usage:
+    video.py [--shotdir <shot path>] [source0] [source1] ...'
+
+    sourceN is an
+     - integer number for camera capture
+     - name of video file
+     - synth:<params> for procedural video
+
+Synth examples:
+    synth:bg=../cpp/lena.jpg:noise=0.1
+    synth:class=chess:bg=../cpp/lena.jpg:noise=0.1:size=640x480
+
+Keys:
+    ESC    - exit
+    SPACE  - save current frame to <shot path> directory
+
+'''
+
 import numpy as np
 import cv2
 from time import clock
@@ -100,8 +129,7 @@ presets = dict(
 
 
 def create_capture(source = 0, fallback = presets['chess']):
-    '''
-      source: <int> or '<int>|<filename>|synth [:<param_name>=<value> [:...]]'
+    '''source: <int> or '<int>|<filename>|synth [:<param_name>=<value> [:...]]'
     '''
     source = str(source).strip()
     chunks = source.split(':')
@@ -136,9 +164,7 @@ if __name__ == '__main__':
     import sys
     import getopt
 
-    print 'USAGE: video.py [--shotdir <dir>] [source0] [source1] ...'
-    print "source: '<int>' or '<filename>' or 'synth:<params>'"
-    print
+    print __doc__
 
     args, sources = getopt.getopt(sys.argv[1:], '', 'shotdir=')
     args = dict(args)
@@ -146,8 +172,6 @@ if __name__ == '__main__':
     if len(sources) == 0:
         sources = [ 0 ]
 
-    print 'Press SPACE to save current frame'
-
     caps = map(create_capture, sources)
     shot_idx = 0
     while True:

samples/python2/watershed.py

@@ -1,18 +1,31 @@
-import numpy as np
-import cv2
-from common import Sketcher
+'''
+Watershed segmentation
+=========
 
-help_message = '''
-  USAGE: watershed.py [<image>]
+This program demonstrates the watershed segmentation algorithm 
+in OpenCV: watershed().
 
-  Use keys 1 - 7 to switch marker color
+Usage
+-----
+watershed.py [image filename]
+
+Keys
+----
+  1-7   - switch marker color
   SPACE - update segmentation
   r     - reset
-  a     - switch autoupdate
+  a     - toggle autoupdate
   ESC   - exit
 
 '''
 
+
+
+
+import numpy as np
+import cv2
+from common import Sketcher
+
 class App:
     def __init__(self, fn):
         self.img = cv2.imread(fn)
@@ -60,5 +73,5 @@ if __name__ == '__main__':
     import sys
     try: fn = sys.argv[1]
     except: fn = '../cpp/fruits.jpg'
-    print help_message
+    print __doc__
     App(fn).run()