Convert LibSVM output to vector of floats

Question

I need to form HOGDescriptor::setSVMDetector() input.

I compute descriptors with openCV then use libSVM to get model file. To form input i know that i need

Answer 1

Ok, it seems things are clear now. Alphas are the first column in my case. Since i had all of them equal to -1 or 1 (dunno why) in my test model, i thought these were labels.

Anyway, here is my parser (but you need to leave only SVs in file):

std::ifstream ifs("cars_model.model");

    const int nsv = 90;
    const int nfeatures = 144;

    float rho = 12.5459;

    char ts[4000] = ""; // !

    std::vector res(nfeatures,0);

    std::vector alphas;

    Mat_ temp(nsv, nfeatures);

    int c = 0;

    std::cout << "Loading model file...\n";

    for (int i=0; i> al;
        alphas.push_back(al);

        for (int j=0; j> ind >> junk >> s;

            temp.at(c, j) = s;

            //std::cout << f << ' ' << s << '\n';

        }

        c++;

    }

    ifs.close();

    std::cout << "Computing primal form...\n";

    for (int i=0; i(i,j) * alpha);
        }

    }

    //res.push_back(-rho);

    std::ofstream ofs("primal.txt");

    for (int i=0; i

And you know, it works. You can set rho as threshold of the detector.