update - correct double-dot extension issue in imwrite_unicode function

modules/__init__.py

@@ -11,7 +11,7 @@ def imwrite_unicode(path, img, params=None):
     root, ext = os.path.splitext(path)
     if not ext:
         ext = ".png"
-    result, encoded_img = cv2.imencode(f".{ext}", img, params if params is not None else [])
+    result, encoded_img = cv2.imencode(ext, img, params if params is not None else [])
     if result:
         encoded_img.tofile(path)
         return True