Revision history [back]

this has nothing to do with opencv, it is all about argc/argv argument parsing

the problem is here:

    if (argc != 1){
             return -1;
     }

your program will always return -1, if you actually give it an argument (because argc will be 2 then, remember, argv[0] is the program name) . so , change it to, e.g. :

    if (argc < 2) {
             cerr << "this program expects a path to an image !" << endl;
             return -1;
     }