diff --git a/detect.py b/detect.py
index 282520b..b9f916f 100644
--- a/detect.py
+++ b/detect.py
@@ -6,7 +6,7 @@ import numpy as np
 
 class Detect:
     def __init__(self):
-        pass
+        self.big_img = None
 
     def read_base64_image(self, base64_string):
         # 解码Base64字符串为字节串