update

modules/__init__.py

@@ -12,7 +12,7 @@ def imwrite_unicode(path, img, params=None):
     if not ext:
         ext = ".png"
     result, encoded_img = cv2.imencode(ext, img, params if params else [])
-    if result:
+    result, encoded_img = cv2.imencode(f".{ext}", img, params if params is not None else [])
         encoded_img.tofile(path)
         return True
     return False