From now on use NaoMover from motion.py

Also use `read_config` from `utils.py`

scripts/detection_demo.py

@@ -1,18 +1,17 @@
 from __future__ import print_function
 from __future__ import division
 
-import json
+from utils import read_config
 from imagereaders import NaoImageReader, VideoReader
 from finders import BallFinder
 
 
 if __name__ == '__main__':
     video = VideoReader(0, loop=True)
-    with open('ball_hsv.json') as f:
-        hsv = json.load(f)
+    hsv = read_config()
     hsv_lower = tuple(map(hsv.get, ('low_h', 'low_s', 'low_v')))
     hsv_upper = tuple(map(hsv.get, ('high_h', 'high_s', 'high_v')))
-    finder = BallFinder(hsv_lower, hsv_upper, 5, None)
+    finder = BallFinder(hsv_lower, hsv_upper, hsv['min_radius'], None)
     try:
         while True:
             frame = video.get_frame()