small bugfix

semseg/SemanticSegmentation.h

@@ -109,7 +109,7 @@ class SemanticSegmentation : public NICE::Persistent
      * @param segresult segmentation results (output)
      * @param probabilities probabilities for each pixel (output)
      */
-    void classify ( const std::vector<std::string> & filelist,
+    virtual void classify ( const std::vector<std::string> & filelist,
                     NICE::MultiChannelImageT<double> & segresult,
                     NICE::MultiChannelImage3DT<double> & probabilities );