diff --git a/script/camtool.py b/script/camtool.py
index 760fa8c..4252e0b 100644
--- a/script/camtool.py
+++ b/script/camtool.py
@@ -175,7 +175,14 @@ class CamTool(DeviceBase):
         self.start()
         self.bg_capture.write(images)
         sleep(2.0)
-        while( self.bg_capture_remain.read() > 0):
+        while(True):
+            finished = True
+            for retry in range(10):
+                if self.bg_capture_remain.read() >0 :
+                    finished = false
+                    break
+            if finished:
+                break
             time.sleep(0.1)                
         #self.stop()        
         #self.bg_capture.write(images)