![www.luxoft.com 13
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cv::Mat img = cv::imread("photo.png");
cv::CascadeClassifier faceCascade;
faceCascade.load("/haarcascade_frontalface_default.xml"));
std::vector<cv::Rect> faces;
faceCascade.detectMultiScale(img, faces, 1.1, 10);
for (int i = 0; i < faces.size(); ++i) {
cv::rectangle(img, faces[i].tl(), faces[i].br(), cv::Scalar(255, 0, 255), 3);
}
cv::imshow("Image", img);
cv::waitKey(0);](https://image.slidesharecdn.com/facerecognitionwithceditedfrazier-210802094641/85/Face-recognition-with-c-13-320.jpg)
![www.luxoft.com 15
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void detect_face_on_image_and_draw_circle(
cv::Mat& img,
cv::CascadeClassifier& faceCascade) {
std::vector<cv::Rect> faces;
faceCascade.detectMultiScale(img, faces, 1.1, 10);
for (int i = 0; i < faces.size(); ++i) {
cv::rectangle(img, faces[i].tl(), faces[i].br(), cv::Scalar(255, 0, 255), 3);
}
}](https://image.slidesharecdn.com/facerecognitionwithceditedfrazier-210802094641/85/Face-recognition-with-c-15-320.jpg)
Face recognition with c++
- 1. www.luxoft.com Facial Recognition with C++ Pavel Zhdanov
- 3. www.luxoft.com 3 www.luxoft.com Algorithm ● Face detection ● Train a face recognition model ● Recognize faces in images (video streams) with OpenCV.
- 4. www.luxoft.com 4 www.luxoft.com std::string path = "photo.png"; cv::Mat img = cv::imread(path); cv::imshow("Image", img); cv::waitKey(0);
- 6. www.luxoft.com 6 www.luxoft.com Haar Cascades An Object Detection Algorithm used to identify faces in an image or real time video
- 7. www.luxoft.com 7 www.luxoft.com https://github.com/opencv/opencv/tree/master/data/haarcascades These include models for: • Face detection • Eye detection • Upper body • Lower body detection • License plate detection • Etc.
- 8. www.luxoft.com 8 www.luxoft.com How It Works The Features
- 9. www.luxoft.com 9 www.luxoft.com Features • Edge • Line • Any structure in the image where there is a sudden change of intensities
- 11. www.luxoft.com 11 www.luxoft.com An edge is detected if the Haar value is closer to 1
- 12. www.luxoft.com 12 www.luxoft.com Sample Haar Features
- 13. www.luxoft.com 13 www.luxoft.com cv::Mat img = cv::imread("photo.png"); cv::CascadeClassifier faceCascade; faceCascade.load("/haarcascade_frontalface_default.xml")); std::vector<cv::Rect> faces; faceCascade.detectMultiScale(img, faces, 1.1, 10); for (int i = 0; i < faces.size(); ++i) { cv::rectangle(img, faces[i].tl(), faces[i].br(), cv::Scalar(255, 0, 255), 3); } cv::imshow("Image", img); cv::waitKey(0);
- 15. www.luxoft.com 15 www.luxoft.com void detect_face_on_image_and_draw_circle( cv::Mat& img, cv::CascadeClassifier& faceCascade) { std::vector<cv::Rect> faces; faceCascade.detectMultiScale(img, faces, 1.1, 10); for (int i = 0; i < faces.size(); ++i) { cv::rectangle(img, faces[i].tl(), faces[i].br(), cv::Scalar(255, 0, 255), 3); } }
- 16. www.luxoft.com 16 www.luxoft.com cv::VideoCapture cap(1); cv::Mat img; while (true) { cap.read(img); cv::imshow("Image", img); cv::waitKey(1); }
- 17. www.luxoft.com 17 www.luxoft.com cv::VideoCapture cap(1); cv::Mat img; cv::CascadeClassifier faceCascade; faceCascade.load(“haarcascade_frontalface_default.xml")); while (true) { cap.read(img); detect_face_on_image_and_draw_circle(img, faceCascade); cv::imshow("Image", img); cv::waitKey(1); }
- 18. www.luxoft.com Thank you for your attention