diff --git a/hgdriver/hgdev/image_process.cpp b/hgdriver/hgdev/image_process.cpp
index fbf086e..7bbf9e4 100644
--- a/hgdriver/hgdev/image_process.cpp
+++ b/hgdriver/hgdev/image_process.cpp
@@ -230,7 +230,9 @@ namespace hg_imgproc
 		~imgproc()
 		{
 		 	free_auto_txt_hanld();
+#ifdef FREE_GLOBAL_OBJECTS
 			cv::unload();
+#endif
 		}
 
 		// load data