Another adaptation, to run on a saved model. Supposed to filter false positives from the detector, the first model (638 positive, 638 negative) run gave 20/34 wrong :( (Plus, the model is 128M, so I'm not in a hurry to include it)

filterneg.cpp

/*
 * Copyright (c) 2011. Philipp Wagner <bytefish[at]gmx[dot]de>.
 * Released to public domain under terms of the BSD Simplified license.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *   * Neither the name of the organization nor the names of its contributors
 *     may be used to endorse or promote products derived from this software
 *     without specific prior written permission.
 *
 *   See <http://www.opensource.org/licenses/bsd-license>
 */
 
#include "opencv2/core/core.hpp"
#include "opencv2/highgui/highgui.hpp"

#include "facerec.hpp"

#include <iostream>
#include <fstream>
#include <sstream>

using namespace cv;
using namespace std;

static void read_file(const string& filename, vector<string>& todo) {
    std::ifstream file(filename.c_str(), ifstream::in);
    if (!file) {
        string error_message = "No valid input file was given, please check the given filename.";
        CV_Error(CV_StsBadArg, error_message);
    }
    string line;
    while (getline(file, line)) {
        todo.push_back(line);
    }
}

int main(int argc, const char *argv[]) {
    if (argc != 2) {
        cout << "usage: " << argv[0] << " <csv.ext>" << endl;
        exit(1);
    }
    string fn = string(argv[1]);
    vector<string> todo;

    try {
        read_file(fn, todo);
    } catch (cv::Exception& e) {
        cerr << "Error opening file \"" << fn << "\". Reason: " << e.msg << endl;
        exit(1);
    }

    Ptr<FaceRecognizer> model = createLBPHFaceRecognizer();
    model->load("posneg.yml");

    for(vector<string>::iterator it = todo.begin(); it != todo.end(); it++) {
        Mat current = imread(*it, 0);
        int predictedLabel = model->predict(current);
        if(predictedLabel == 0)
          cout << *it << endl;
    }

    return 0;
}