diff --git a/config/config_models.py b/config/config_models.py
index 90b7f3f..1579098 100644
--- a/config/config_models.py
+++ b/config/config_models.py
@@ -13,6 +13,7 @@ class ROIType(str, Enum):
     """ROI类型枚举"""
     POLYGON = "polygon"
     RECTANGLE = "rectangle"
+    FULLSCREEN = "fullscreen"
 
 
 class AlgorithmType(str, Enum):
diff --git a/core/preprocessor.py b/core/preprocessor.py
index 5571b70..6343aac 100644
--- a/core/preprocessor.py
+++ b/core/preprocessor.py
@@ -43,7 +43,9 @@ class ROICropper:
             裁剪后的图像，失败返回None
         """
         try:
-            if roi.roi_type == ROIType.RECTANGLE:
+            if roi.roi_type == ROIType.FULLSCREEN:
+                return image.copy()
+            elif roi.roi_type == ROIType.RECTANGLE:
                 return self._crop_rectangle(image, roi.coordinates)
             elif roi.roi_type == ROIType.POLYGON:
                 return self._crop_polygon(image, roi.coordinates)
@@ -137,7 +139,10 @@ class ROICropper:
         height, width = image_shape
         mask = np.zeros((height, width), dtype=np.uint8)
         
-        if roi.roi_type == ROIType.RECTANGLE:
+        if roi.roi_type == ROIType.FULLSCREEN:
+            mask[:] = 255
+
+        elif roi.roi_type == ROIType.RECTANGLE:
             if len(roi.coordinates) >= 2:
                 x1, y1 = int(roi.coordinates[0][0]), int(roi.coordinates[0][1])
                 x2, y2 = int(roi.coordinates[1][0]), int(roi.coordinates[1][1])