Update shape_transformation.cpp

modules/xfeatures2d/samples/shape_transformation.cpp

@@ -26,9 +26,14 @@ static void help()
 int main(int argc, char** argv)
 {
     help();
+    if (argc < 3)
+    {
+      printf("Not enough parameters\n");
+      return -1;
+    }
     Mat img1 = imread(argv[1], IMREAD_GRAYSCALE);
     Mat img2 = imread(argv[2], IMREAD_GRAYSCALE);
-    if(img1.empty() || img2.empty() || argc<2)
+    if(img1.empty() || img2.empty())
     {
         printf("Can't read one of the images\n");
         return -1;