I am working on the problem of face recognition. I need a help to display, the name of that person in the image by tagging(Display the name of the person by performing face recognition). Can anyone help me with this?
Hi, I would decompose the problem in two steps : create a learning database of the person you want to tag, and the recognition step. For the first step, you will first have to create a database containing multiple view of the face of each person you want to recognize. That database will consist of a list of pictures with the corresponding name. So to sum up:
vector<Mat> images;
vector<int> labels;
vector<string> names;
images = [pic1;pic2;pic3;pic4;...]
labels = [0 ;0 ;1 ;2 ;...]
names = [nom1;nom2;nom3]
In this example, you have 3 persons, with some pictures of them. labels correspond to the index in the names vector.
You can then use a classifier (I suggest you the LBP face detector):
Ptr<FaceRecognizer> model = createLBPHFaceRecognizer();
model->train(images, labels);
Now model contains everything you need to tag peoples. To get the class, you just have to do that:
int predicted = model->predict(askingImg);
cout<<"Hello "<<names[predicted]<<"!"<<endl;
Thanks for your suggestion. I tried the following code for face recognition in videos http://docs.opencv.org/trunk/modules/contrib/doc/facerec/tutorial/facerec_video_recognition.html And I made necessary changes according to your answer to display names in the program. But I failed to do it. When I say this int predicted = model->predict(askingImg); cout<<names[prediction]<<endl; nothing is displayed in the command window.
Please let me know if there is a way to tag people in a video.
I actually tried with your answer. But the name of the person is not getting displayed in the video. I am now trying to display names of person in a video. For that I am using the code from the following link http://docs.opencv.org/trunk/modules/contrib/doc/facerec/tutorial/facerec_video_recognition.html
and I tried your answer to display the names of the persons in the video. But it is failing.
Below is the code
//g++ -ggdb pkg-config --cflags opencv -o basename online_faceRec_video.cpp .cpp online_faceRec_video.cpp pkg-config --libs opencv
/* * Copyright (c) 2011. Philipp Wagner <bytefish[at]gmx[dot]de>. * Released to public domain under terms of the BSD Simplified license.
using namespace cv; //using namespace cv::face; using namespace std;
static void read_csv(const string& filename, vector<mat>& images, vector<int>& labels, vector<string>& names, char separator = ';') { 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, path, classlabel,classnames; while (getline(file, line)) { stringstream liness(line); getline(liness, path, separator); getline(liness, classlabel); getline(liness, classnames); if(!path.empty() && !classlabel.empty()) { images.push_back(imread(path, 0)); labels.push_back(atoi(classlabel.c_str())); names.push_back(classnames.c_str()); } } } int main(int argc, const char *argv[]) { // Check for valid command line arguments, print usage // if no arguments were given. if (argc != 4) { cout << "usage: " << argv[0] << " </path> </path> </path>" << endl; cout << "\t </path> -- Path to the Haar Cascade for face detection." << endl; cout << "\t </path> -- Path to the CSV file with the face database." << endl; cout << "\t <device id=""> -- The webcam device id to grab frames from." << endl; exit(1); } // Get the path to your CSV: string fn_haar = string(argv[1]); string fn_csv = string(argv[2]); int deviceId = atoi(argv[3]); // These vectors hold the images and corresponding labels: vector<mat> images; vector<int> labels; vector<string> names;
try {
read_csv(fn_csv, images, labels,names);
} catch (cv::Exception& e) {
cerr << "Error opening file \"" << fn_csv << "\". Reason: " << e.msg << endl;
exit(1);
}
int im_width = images[0].cols;
int im_height = images[0].rows;
Ptr<FaceRecognizer> model = createFisherFaceRecognizer ...Asked: 2014-10-26 21:42:31 -0600
Seen: 2,123 times
Last updated: Nov 14 '14