fix handle

demo/three_color.py

 # Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
 import argparse
 import cv2
+import urllib
+import numpy as np
 
 from maskrcnn_benchmark.config import cfg
 from demo.predictor import COCODemo
@@ -69,11 +71,10 @@ def img_to_three_color_map(img):
 
 def handle_from_url(image_url):
     """ 处理网路图片 """
-    cap = cv2.VideoCapture(image_url)
-    if (cap.isOpened()):
-        ret, img = cap.read()
-        return img_to_three_color_map(img)
-    return None
+    resp = urllib.request.urlopen(image_url)
+    image = np.asarray(bytearray(resp.read()), dtype="uint8")
+    image = cv2.imdecode(image, cv2.IMREAD_COLOR)
+    return img_to_three_color_map(image)
 
 
 def handle_from_path(image_path):