What is the principle of face recognition?

The principle of face recognition is to capture an image or video stream containing a face with a camera, and automatically detect and track the face in the image, so as to recognize the detected face. Face recognition is a biometric technology based on human facial feature information, and its essence is image processing.

When a machine or mobile phone processes an image, it is necessary to check the geometry of facial organs and the distance between them. After the above operations are completed, compare with the facial features input for the first time, so as to realize successful information authentication and unlock the mobile phone.

The traditional face recognition technology is mainly based on visible images, but this method has insurmountable defects, especially when the ambient illumination changes, the recognition effect will drop sharply, which can not meet the needs of the actual system.

With the development of science and technology, multi-light source face recognition technology based on active near-infrared images has emerged. It can overcome the influence of light change and achieve excellent recognition performance. The performance of the whole system in accuracy, stability, speed, etc. exceeds that of 3D image face recognition. This technology has developed rapidly in recent two or three years, which makes face recognition technology gradually practical.