fix issue 2086

ppocr/utils/utility.py

@@ -14,7 +14,6 @@
 
 import logging
 import os
-import imghdr
 import cv2
 
 
@@ -52,12 +51,14 @@ def get_image_file_list(img_file):
         raise Exception("not found any img file in {}".format(img_file))
 
     img_end = {'jpg', 'bmp', 'png', 'jpeg', 'rgb', 'tif', 'tiff', 'gif', 'GIF'}
-    if os.path.isfile(img_file) and imghdr.what(img_file) in img_end:
+    if os.path.isfile(img_file) and os.path.splitext(img_file)[-1][
+            1:] in img_end:
         imgs_lists.append(img_file)
     elif os.path.isdir(img_file):
         for single_file in os.listdir(img_file):
             file_path = os.path.join(img_file, single_file)
-            if os.path.isfile(file_path) and imghdr.what(file_path) in img_end:
+            if os.path.isfile(file_path) and os.path.splitext(file_path)[-1][
+                    1:] in img_end:
                 imgs_lists.append(file_path)
     if len(imgs_lists) == 0:
         raise Exception("not found any img file in {}".format(img_file))