Expe on synthetic images

Code/Seg/DirectionalScanner/dynamicalscannero8.cpp

@@ -241,6 +241,12 @@ void DynamicalScannerO8::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
+  {            //   of the support line inequations.
+    dla = -dla;
+    dlb = -dlb;
+    c = -c;
+  }
   dlc1 = c - nu / 2;
   dlc2 = c + nu / 2;
 }

Code/Seg/ImageTools/vr2i.h

@@ -87,6 +87,14 @@ public:
     return ((xv * vec.xv + yv * vec.yv)
             * (xv * vec.xv + yv * vec.yv)); }
 
+  /**
+   * @fn bool leftside (Vr2i vec)
+   * \brief Returns if the given vector is on the left side of the vector.
+   * @param vec The given vector.
+   */
+  inline bool leftside (Vr2i vec) const {
+    return (xv * vec.yv > yv * vec.xv); }
+
   /**
    * @fn int squaredVectorProduct (Vr2i vec)
    * \brief Returns the squared norm of the vector product with given vector.