add resolution selection

sobel.py

@@ -38,6 +38,12 @@
     type=float,
     help="rescale image by this factor",
     default=1.0)
+parser.add_argument(
+    "-s",
+    "--set_resolution",
+    type=int,
+    nargs=2,
+    help='override default camera resolution as H W')
 parser.add_argument(
     'video_file',
     metavar='video_file',
@@ -101,6 +107,12 @@ def nothing(x):
         neighbourhood,
         15,
         nothing)
+
+    # override default camera resolution
+
+    if (args.set_resolution is not None):
+        cap.set(cv2.CAP_PROP_FRAME_HEIGHT, args.set_resolution[1])
+        cap.set(cv2.CAP_PROP_FRAME_WIDTH, args.set_resolution[0])
 
     while (keep_processing):