diff --git a/hgdriver/hgdev/hg_scanner_239.cpp b/hgdriver/hgdev/hg_scanner_239.cpp
index 596031e..f3b0559 100644
--- a/hgdriver/hgdev/hg_scanner_239.cpp
+++ b/hgdriver/hgdev/hg_scanner_239.cpp
@@ -843,7 +843,7 @@ else
 	ic.is_autocontrast = 0;					//无参数
 	ic.is_autocrop = (ic.papertype == TwSS::None || ic.papertype ==TwSS::USStatement);
 	ic.is_autodiscradblank_normal = image_prc_param_.bits.page == PAGE_OMIT_EMPTY;
-	ic.discardblank_percent = omit_empty_level_ >= 60 ? 60 : omit_empty_level_;  	//默认20
+	ic.discardblank_percent = omit_empty_level_ >= 70 ? 70 : omit_empty_level_; 
 	ic.is_autodiscradblank_vince = image_prc_param_.bits.page == PAGE_OMIT_EMPTY_RECEIPT;
 	ic.is_switchfrontback = image_prc_param_.bits.exchange;
 	ic.autodescrew = image_prc_param_.bits.automatic_skew;
@@ -886,7 +886,7 @@ else
 	ic.errorExtention = image_prc_param_.bits.error_extention ;//
 	ic.textureRemove = image_prc_param_.bits.remove_txtture;//
 	ic.splitImage = image_prc_param_.bits.split;
-
+{
 	ic.cropRect.enable = custom_area_;
 	int height = (custom_area_br_y_ *ic.resolution_dst) /25.4 -  (custom_area_lt_y_ *ic.resolution_dst /25.4);
 	int width 	= (custom_area_br_x_ *ic.resolution_dst) /25.4 - (custom_area_lt_x_ *ic.resolution_dst /25.4);
@@ -894,7 +894,7 @@ else
 	ic.cropRect.width = width;
 	ic.cropRect.x = custom_area_lt_x_ *ic.resolution_dst /25.4;
 	ic.cropRect.y = custom_area_lt_y_ *ic.resolution_dst /25.4;
-
+}
 	ic.multiOutput = (MultiOutput)image_prc_param_.bits.multi_out; 
 	ic.normalCrop = image_prc_param_.bits.dark_sample;
 	ic.dogeardistabce = fractate_level_;
@@ -929,9 +929,6 @@ else
 	||image_prc_param_.bits.paper == PAPER_MAX_SIZE 
 	||image_prc_param_.bits.paper == PAPER_MAX_SIZE_CLIP 
 	||image_prc_param_.bits.paper == PAPER_TRIGEMINY
-	||image_prc_param_.bits.paper == PAPER_16K
-	||image_prc_param_.bits.paper == PAPER_8K
-	||image_prc_param_.bits.paper == PAPER_16K_LATERAL
 	)
 	{
 		ic.cropRect.enable = false;
@@ -1567,8 +1564,8 @@ void hg_scanner_239::thread_handle_usb_read(void)
 				LOG_INFO(LOG_LEVEL_DEBUG_INFO, "received 'STOPSCAN' message in usb thread, check remaining image and finish scanning ...\n");
 
 				// fetch all buffered images and exit ...
-				while(!is_dev_image_process_done())
-					std::this_thread::sleep_for(std::chrono::milliseconds(30));
+				//while(!is_dev_image_process_done())
+				std::this_thread::sleep_for(std::chrono::milliseconds(1000));
 
 				while (get_image_count() > 0)
 				{