Update Samples

samples/cpp/demhist.cpp

@@ -56,11 +56,6 @@ static void updateBrightnessContrast( int /*arg*/, void* )
                    Scalar::all(0), -1, 8, 0 );
     imshow("histogram", histImage);
 }
-static void help()
-{
-    std::cout << "\nThis program demonstrates the use of calcHist() -- histogram creation.\n"
-              << "Usage: \n" << "demhist [image_name -- Defaults to baboon.jpg]" << std::endl;
-}
 
 const char* keys =
 {
@@ -70,9 +65,10 @@ const char* keys =
 int main( int argc, const char** argv )
 {
     CommandLineParser parser(argc, argv, keys);
+    parser.about("\nThis program demonstrates the use of calcHist() -- histogram creation.\n");
     if (parser.has("help"))
     {
-        help();
+        parser.printMessage();
         return 0;
     }
     string inputImage = parser.get<string>(0);