using svm xml file for object detection

asked 2015-12-10 00:44:55 -0500

kaushikmit gravatar image

I am trying to use SVM for object detection. I have a set of a positive and negative images. Using this code I have trained the files into an xml file. Now I want a code that can use that file for object detection.

#include <opencv2/core/core.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <cv.h>
#include <highgui.h>
#include <cvaux.h>
#include <iostream>
#include <vector>
using namespace std;
using namespace cv;

int main ( int argc, char** argv )
    cout << "OpenCV Training SVM Automatic Number Plate Recognition\n";
    cout << "\n";

    char* path_Plates;
    char* path_NoPlates;
    int numPlates;
    int numNoPlates;
    int imageWidth=150;
    int imageHeight=150;

    //Check if user specify image to process
        numPlates= 12;
        numNoPlates= 67 ;
        path_Plates= "/home/kaushik/opencv_work/Manas6/Pics/Positive_Images/";
        path_NoPlates= "/home/kaushik/opencv_work/Manas6/Pics/Negative_Images/i";

        cout << "Usage:\n" << argv[0] << " <num Plate Files> <num Non Plate Files> <path to plate folder files> <path to non plate files> \n";
        return 0;

    Mat classes;//(numPlates+numNoPlates, 1, CV_32FC1);
    Mat trainingData;//(numPlates+numNoPlates, imageWidth*imageHeight, CV_32FC1 );

    Mat trainingImages;
    vector<int> trainingLabels;

    for(int i=1; i<= numPlates; i++)

        stringstream ss(stringstream::in | stringstream::out);

            const char* a = ss.str().c_str();
            Mat img = imread(ss.str(), CV_LOAD_IMAGE_UNCHANGED);
            img= img.clone().reshape(1, 1);
        catch(Exception e){;}

    for(int i=0; i< numNoPlates; i++)
        stringstream ss(stringstream::in | stringstream::out);
        ss << path_NoPlates<<i << ".jpg";
            const char* a = ss.str().c_str();
            Mat img=imread(ss.str(),CV_LOAD_IMAGE_UNCHANGED);
            img= img.clone().reshape(1, 1);
        catch(Exception e){;}

    //trainingData = trainingData.reshape(1,trainingData.rows);
    trainingData.convertTo(trainingData, CV_32FC1);

    FileStorage fs("SVM.xml", FileStorage::WRITE);
    fs << "TrainingData" << trainingData;
    fs << "classes" << classes;

    return 0;

Also I have downloaded the code given in documentation but i am unable to use it. Any help would be greatly appreciatd.

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unfortunately, so far, you have not trained anything. all you did was, to save the traindata to disk.

berak gravatar imageberak ( 2015-12-10 00:46:55 -0500 )edit

are you using opencv3 ?

here's the original 2.4 code

berak gravatar imageberak ( 2015-12-10 01:02:26 -0500 )edit

Sorry Berak , but I am totally new to svm.I wanted to know what do i do next?

kaushikmit gravatar imagekaushikmit ( 2015-12-10 01:12:22 -0500 )edit

Please, don't duplicate posts

LorenaGdL gravatar imageLorenaGdL ( 2015-12-10 01:14:58 -0500 )edit