diff --git a/script/ImageStats.py b/script/ImageStats.py
index 894e1a8..b4d2ccb 100644
--- a/script/ImageStats.py
+++ b/script/ImageStats.py
@@ -26,7 +26,7 @@ def get_centroid(source):
         centroid  = (results.getValue("XM",0), results.getValue("YM",0))
         ov = Crosshairs(Pen(java.awt.Color.ORANGE),  java.awt.Point(int(centroid[0]),int(centroid[1])), java.awt.Dimension(15,15))
         op.addOverlay(ov)
-        return centroid
+        return centroid    
               
 
 
@@ -39,15 +39,16 @@ class SimulatedSource(Filter):
         if img is None: 
             return None 
         ip = load_image(img)         
-        pad_h = int((random.random()-0.5) * 20)
-        pad_v = int((random.random()-0.5) * 20)
+        pad_h = int((random.random()-0.5) * 300)
+        pad_v = int((random.random()-0.5) * 300)
+        print "Pad = " , (pad_h, pad_v)
         ip = pad_image(ip, -pad_h, pad_h, pad_v, -pad_v, fill_color = Color.BLACK)
         return ip.getBufferedImage() 
         #return img
         
     def waitNext(self, timeout):
         #self.pushImage(self.process(self.img,None))
-        self.process(self.img, None)
+        self.pushImage(self.process(self.img, None))
         print "---> " , self.getImage()
         
         
@@ -64,18 +65,22 @@ class ImageStats(DeviceBase):
         self.com_x_samples, self.com_y_samples = [], []
         class ComX(Readable):
             def read(self):     
+                if len(self.image_stats.com_x_samples)==0: return None
                 return mean(self.image_stats.com_x_samples)
         self.com_x_mean = ComX(); self.com_x_mean.image_stats = self
         class ComY(Readable):
             def read(self):     
+                if len(self.image_stats.com_y_samples)==0: return None
                 return mean(self.image_stats.com_y_samples)
         self.com_y_mean = ComY(); self.com_y_mean.image_stats = self
         class ComXVar(Readable):
             def read(self):     
+                if len(self.image_stats.com_x_samples)==0: return None
                 return stdev(self.image_stats.com_x_samples)
         self.com_x_stdev = ComXVar(); self.com_x_stdev.image_stats = self
         class ComXVar(Readable):
             def read(self):     
+                if len(self.image_stats.com_y_samples)==0: return None
                 return stdev(self.image_stats.com_y_samples)
         self.com_y_stdev = ComXVar(); self.com_y_stdev.image_stats = self
         set_device_alias(self.com_x_mean, name + " com x mean")
@@ -116,8 +121,8 @@ if __name__ == "__builtin__":
     
     add_device(ImageStats("image_stats", simulated_source), True)
     image_stats.enableBackground(False)    
-    for i in range (1):        
+    for i in range (10):        
         image_stats.update()        
         print image_stats.take(), image_stats.com_x_mean.read(), image_stats.com_y_mean.read() 
-        
+        time.sleep(1)