[CCV] Added method to visualize gaussian pyramids

Signed-off-by: Jim Martens <github@2martens.de>

ccv/saliency/includes/lab_pyramid.h

@@ -68,6 +68,12 @@ public:
      */
     gauss_pyramid get_pyramid(int channel);
 
+    /**
+     * Visualizes the gaussian pyramids.
+     * They need to be created first.
+     */
+    void visualize_gaussian_pyrs();
+
     /**
      * Computes the center-surround and surround-center contrasts and stores them for later use.
      *