Merge pull request #10529 from LaurentBerger:ExampleGoogleNet

* Add a parameter labels to command line

* default value

* samples: caffe_googlenet.cpp minor refactoring

samples/dnn/caffe_googlenet.cpp

@@ -60,7 +60,7 @@ static void getMaxClass(const Mat &probBlob, int *classId, double *classProb)
     *classId = classNumber.x;
 }
 
-static std::vector<String> readClassNames(const char *filename = "synset_words.txt")
+static std::vector<String> readClassNames(const char *filename )
 {
     std::vector<String> classNames;
 
@@ -87,6 +87,7 @@ const char* params
     = "{ help           | false | Sample app for loading googlenet model }"
       "{ proto          | bvlc_googlenet.prototxt | model configuration }"
       "{ model          | bvlc_googlenet.caffemodel | model weights }"
+      "{ label          | synset_words.txt | names of ILSVRC2012 classes }"
       "{ image          | space_shuttle.jpg | path to image file }"
       "{ opencl         | false | enable OpenCL }"
 ;
@@ -106,6 +107,7 @@ int main(int argc, char **argv)
     String modelTxt = parser.get<string>("proto");
     String modelBin = parser.get<string>("model");
     String imageFile = parser.get<String>("image");
+    String classNameFile = parser.get<String>("label");
 
     Net net;
     try {
@@ -113,7 +115,7 @@ int main(int argc, char **argv)
         net = dnn::readNetFromCaffe(modelTxt, modelBin);
         //! [Read and initialize network]
     }
-    catch (cv::Exception& e) {
+    catch (const cv::Exception& e) {
         std::cerr << "Exception: " << e.what() << std::endl;
         //! [Check that network was read successfully]
         if (net.empty())
@@ -169,7 +171,7 @@ int main(int argc, char **argv)
     //! [Gather output]
 
     //! [Print results]
-    std::vector<String> classNames = readClassNames();
+    std::vector<String> classNames = readClassNames(classNameFile.c_str());
     std::cout << "Best class: #" << classId << " '" << classNames.at(classId) << "'" << std::endl;
     std::cout << "Probability: " << classProb * 100 << "%" << std::endl;
     //! [Print results]