updated tutorial with new retina interface use

samples/cpp/tutorial_code/contrib/retina_tutorial.cpp

@@ -99,10 +99,10 @@ int main(int argc, char* argv[]) {
         // if the last parameter is 'log', then activate log sampling (favour foveal vision and subsamples peripheral vision)
         if (useLogSampling)
         {
-                        myRetina = new cv::Retina(inputFrame.size(), true, cv::RETINA_COLOR_BAYER, true, 2.0, 10.0);
+                        myRetina = cv::createRetina(inputFrame.size(), true, cv::RETINA_COLOR_BAYER, true, 2.0, 10.0);
         }
         else// -> else allocate "classical" retina :
-            myRetina = new cv::Retina(inputFrame.size());
+            myRetina = cv::createRetina(inputFrame.size());
 
         // save default retina parameters file in order to let you see this and maybe modify it and reload using method "setup"
         myRetina->write("RetinaDefaultParameters.xml");