Embedded human face recognition gate prohibition attendance-recording machine

Abstract

The invention relates to an embedded type door control work attendance checking machine with the function of face recognition, which belongs to the technical field of biological characteristic recognition. The door control work attendance checking machine adopts the technical scheme that an embedded type host DSP is used, and the machine comprises a CMOS infrared photography module used for capturing facial images, an infrared Led Module used as a constant light source, a Wiegand interface and a USB interface; besides, infrared light filters with narrow bands are arranged on the camera shot of the CMOS infrared photography module, and the band width of the infrared light filters with narrow bands only allows near infrared light emitted by the infrared Led Module to pass through and shields visible light and other kinds of infrared light in the sunlight; the DSP presents the simulated generation of door control Wiegand signals by an IO interface and is used as a standard output control means for door control. The machine adopts the infrared light filters with narrow bands and the infrared Led Module to thoroughly solve the problem of visible light influence, which troubles face recognition for a long time, and the machine has the advantages of unique convenience, untouchable performance and stability and can be widely applied to the field of door control work attendance check.

Description

technical field [0001] The invention belongs to the field of biometric identification, and relates to an embedded face recognition access control time attendance machine, in particular to an access control time attendance machine using an infrared narrowband infrared filter for infrared face recognition technology. Background technique [0002] The access control system has been widely used in the world, and the product application types have developed from contact to non-contact, from ID cards and IC cards to biometric identification, and from single access control functions to dual functions of access control and time attendance. At present, a large number of devices with dual functions of biometric identification and access control time attendance are sold in the market, mainly fingerprint identification access control time attendance products, but due to the inherent defects of fingerprints such as peeling, dry and wet fingers, high rejection rate, and fingerprint printin...

AI Technical Summary

Problems solved by technology

However, the amount of computation of the face recognition algorithm is far greater than that of the fingerprint recognition algorithm, so it is generally limited to online applications on the PC platform, such as the "Face Recognition Access Control and Attendance System" of the authorized announcement number CN 1110767C

In addition, studies have shown that the feature difference of the same person under different light is even greater than the feature difference between different people under the same light. Therefore, face recognition technology based on visible light images has insurmountable defects in the influence of ambient light. When the ambient light during recognition is different from that during registration, the recognition performance will be greatly reduced, which cannot meet the requirements of actual product applications.

It is for this reason that the current face recognition access control attendance is limited to first entering the job number or swiping the card, and then performing a 1:1 face recognition comparison, which greatly reduces the convenience of the biometric recognition product itself.

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