Update app.py

app.py

@@ -20,7 +20,7 @@ from depth_anything.dpt import DepthAnything
 from depth_anything.util.transform import Resize, NormalizeImage, PrepareForNet
 from moviepy.editor import *
 
-edge = None
+edge = []
 gradient = None
 params = { "fnum":0, "l":16, "c":3, "k":7 }
 frame_selected = 0
@@ -342,7 +342,7 @@ def select_frame(v, evt: gr.SelectData):
     if evt.index != frame_selected:
         masks[frame_selected] = v
         frame_selected = evt.index
-        edge = None
+        edge = []
         
     return masks[frame_selected], frame_selected
 
@@ -382,8 +382,8 @@ def draw_mask(l, c, k, v, d, evt: gr.EventData):
     delta = 0
     ddepth = cv2.CV_16S
 
-    if edge == None or params["fnum"] != frame_selected or params["l"] != l or params["c"] != c or params["k"] != k:
-      if edge != None:
+    if edge == [] or params["fnum"] != frame_selected or params["l"] != l or params["c"] != c or params["k"] != k:
+      if edge != []:
           d["background"] = cv2.imread(masks[frame_selected]).astype(np.uint8)
 
       bg = cv2.cvtColor(d["background"], cv2.COLOR_RGBA2GRAY)