Enable fade & rudimentary delay in image display

head_pose.py

@@ -59,6 +59,12 @@ argParser.add_argument(
     default=15,
     help="Interval at which to save heatmap frames (in seconds)"
 )
+argParser.add_argument(
+    '--queue-length',
+    type=int,
+    default=0,
+    help="Nr of frames to keep in queue (adds a delay)"
+)
 
 args = argParser.parse_args()
 
@@ -231,6 +237,8 @@ if args.output_dir:
     startTime = time.time()
     lastSaveTime = startTime
 
+if args.queue_length:
+    imageQueue = []
 
 while True:
     t1 = time.time()
@@ -451,6 +459,13 @@ while True:
     wpercent = (imageWindowSize[0] / float(image.size[0]))
     hsize = int((float(image.size[1]) * float(wpercent)))
     image = image.resize((imageWindowSize[0], hsize))
+
+    if args.queue_length:
+        imageQueue.append(image)
+        if len(imageQueue) > args.queue_length:
+            logger.warn("Use image from queue :-)")
+            image = imageQueue.pop(0)
+
     tkpi = ImageTk.PhotoImage(image)
     imageCanvas.delete("IMG")
     imagesprite = imageCanvas.create_image(500,500,image=tkpi, tags="IMG")
@@ -485,7 +500,7 @@ while True:
         pass
 
     # (optionally) very slowly fade out previous metrics:
-    # metrics = metrics * .999
+    metrics = metrics * .9997
 
     keyPress = cv2.waitKey(5)