Building Computer Vision Projects with OpenCV 4 and C++

Face Detection and Recognition with the DNN Module

In this chapter, we are going to learn the main techniques of face detection and recognition. Face detection is the process whereby faces are located in a whole image. In this chapter, we are going to cover different techniques to detect faces in images, from classic algorithms using cascade classifiers with Haar features to newer techniques using deep learning. Face recognition is the process of identifying a person that appears in an image. We are going to cover the following topics in this chapter:

• Face detection with different methods
• Face preprocessing
• Training a machine learning algorithm from collected faces
• Face recognition
• Finishing touches