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Another solution that I often use is to create a text file containing the image names and pass that filename as argument.

The text file can be created with ls *.jpg > process.txt (or dir *.jpg > process.txt in Windows).

Then read the file line by line:

ifstream myfile(argv[1]);
while(!myfile.eof()){
    getline(myfile,imagefilename);
    cv::imread(img,imagefilename);
    //...process img...
}
myfile.close();