diff --git a/script/device/Image.py b/script/device/Image.py
index f115639..9ff6d46 100644
--- a/script/device/Image.py
+++ b/script/device/Image.py
@@ -26,6 +26,7 @@ class ImageCorrectedIntensity(DeviceBase, Readable):
         ret = self.getParent().intensity.take()         
         if ret is not None:             
             trans = transm.value    
+            count_time = get_count_time()
             if (trans == 0.0) or (count_time==0):
                 ret= float("nan")
             else:
@@ -145,5 +146,5 @@ pixel.addListener(_pixelListener)
 
 add_device(RegisterMatrixSource("detector_image", image.matrix), True)      
 detector_image.monitored = True
-
+image.matrix.update()