Update app.py

app.py

@@ -347,6 +347,13 @@ def process_line(img, outdir='./output'):
 
     # 检查输入是否为字符串路径
     if isinstance(img, str):
+        # 打印尝试读取的路径
+        print(f"Trying to read image from: {img}")
+        
+        # 检查文件是否存在
+        if not os.path.isfile(img):
+            raise ValueError(f"The file {img} does not exist.")
+        
         img = cv2.imread(img)  # 读取图像文件
         if img is None:
             raise ValueError("Failed to read the image. Check the file path.")