--- CV/CV.xs	2006/03/07 16:26:25	1.34
+++ CV/CV.xs	2006/03/07 16:45:53	1.35
@@ -357,7 +357,7 @@
         double diff = 0.;
         int peak = 0;
 
-        if (x && y)
+        if (w && h)
           for (y = 0; y < h; y++)
             {
               guchar *pa_ = pa + y * sa;