diff --git a/hgdriver/hgdev/image_process.cpp b/hgdriver/hgdev/image_process.cpp
index 50a2617..bfc3aca 100644
--- a/hgdriver/hgdev/image_process.cpp
+++ b/hgdriver/hgdev/image_process.cpp
@@ -1167,7 +1167,7 @@ namespace hg_imgproc
 			mats_.clear();
 
 			double 		threshold = 40;
-			int 		edge = 30;
+			int 		edge = 40;
 			int dis = img_conf_.discardblank_percent;
 			if (img_conf_.is_autodiscradblank_vince)
 				dis *= 1.5;