multiple cameras and frame saving in video.py

samples/python2/browse.py

@@ -16,7 +16,7 @@ if len(sys.argv) > 1:
     img = cv2.imread(fn)
 else:
     sz = 4096
-    print 'generating %dx%d procudural image ...' % (sz, sz)
+    print 'generating %dx%d procedural image ...' % (sz, sz)
     img = np.zeros((sz, sz), np.uint8)
     track = np.cumsum(np.random.rand(500000, 2)-0.5, axis=0)
     track = np.int32(track*10 + (sz/2, sz/2))

samples/python2/video.py

@@ -49,13 +49,30 @@ def create_capture(source):
 
 if __name__ == '__main__':
     import sys
-    try: fn = sys.argv[1]
+    import argparse
-    except: fn = 'synth:bg=../cpp/lena.jpg:noise=0.1'
     
-    cap = create_capture(fn)
+    parser = argparse.ArgumentParser()
+    parser.add_argument('sources', nargs='*', default=['synth:bg=../cpp/lena.jpg:noise=0.1'])
+    parser.add_argument('-shotdir', nargs=1, default='.')
+    args = parser.parse_args()
+    print args
+
+    print 'Press SPACE to save current frame'
+
+    caps = map(create_capture, args.sources)
+    shot_idx = 0
     while True:
+        imgs = []
+        for i, cap in enumerate(caps):
             ret, img = cap.read()
-        cv2.imshow('img', img)
+            imgs.append(img)
+            cv2.imshow('capture %d' % i, img)
         ch = cv2.waitKey(1)
         if ch == 27:
             break
+        if ch == ord(' '):
+            for i, img in enumerate(imgs):
+                fn = '%s/shot_%d_%03d.bmp' % (args.shotdir[0], i, shot_idx)
+                cv2.imwrite(fn, img)
+                print fn, 'saved'
+            shot_idx += 1