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 overall system performance exceeds that of 3D face recognition in accuracy, stability and speed. This technology has developed rapidly in recent two or three years, which makes face recognition technology gradually practical.