Negative b for octant 1

Code/Seg/DirectionalScanner/dynamicalscannero1.cpp

@@ -240,7 +240,7 @@ void DynamicalScannerO1::bindTo (int a, int b, int c)
     nu = (templ_nu * new_n1) / old_n1;
   else
     nu = (templ_nu * new_ninf) / old_ninf;
-  if (dlb < 0)  // dlb should stay positive to avoid the direction change
+  if (dlb > 0)  // dlb should stay negative to avoid the direction change
   {             //   of the support line inequations.
     dla = -dla;
     dlb = -dlb;