The Design Of Low-power Palm Print & Palm Vein Recognition Module Base On Cotex-M4

With the growing demand for personal identity authentication in the information society,biometric technology and products have been widely applied to all aspects of social life.Palm print and palm vein recognition technology is a new biometric technology born in the past ten years.This technology has occupied a place in the biometric technology industry because of its Multimoding,anti-prosthesis,anti-counterfeiting and high precision.However,the traditional palm print and palm vein biometric products are limited to commercial markets such as access control and attendance due to factors such as excessive volume and high power,resulting in palm print and palm vein biometric technology still in a vacant situation in portable devices and personal terminal markets.In order to fill the gap in the portable field of palm print and palm vein recognition products,this subject researches and designs a palm print and palm vein recognition module suitable for portable devices and personal terminal products.The module is based on the ARM architecture Cotex-M4 core CPU.With low power consumption and small size,it can independently perform local offline authentication.This topic mainly carried out the following work:Improved light source and optical path design.The light source and optical path design scheme of the original palm print and palm vein recognition system has higher power dissipation and lower light utilization rate.In this subject,the number of 6 visible light LEDs and 12 infrared LEDs is reduced to 4 and 8 respectively.The light guide lens is redesigned according to the principle of TIR lens,which improves the light utilization rate and reduces the light source power dissipation of the system.Consumption,through the adjustment of the parameters of the image sensor,the brightness of the image obtained by the system is similar to that of the original system.A structure of a miniaturized palm print and palm vein recognition module was designed.Based on the improved light source and optical path design scheme,combined with the current mainstream portable device dimensions,a compact palm print and palm vein recognition module structure suitable for portable devices is designed.Through the rational layout of the components,the system structure size is reduced to 38x28x16 mm by using a stacked structure design.A hardware circuit based on Cotex-M4 low-power palm print and palm vein recognition module is designed.Aiming at the defect of high power consumption of the original palm print and palm vein system hardware circuit,a hardware circuit based on Cotex-M4 architecture is designed to design a palm print and palm vein recognition module with low power consumption and local offline authentication.With minimum system selection and design,circuit PCB design,and power estimation of the circuitry,the circuit estimates power consumption to less than 2W.After testing,the system designed by this project has a maximum power of 1890 mW,a rated power of 1320.5mW,and a standby power of 25?W.The system supports local feature storage and offline authentication for 20 people,and the recognition speed is less than 2s.The system can meet the needs of integration into portable devices and personal terminal devices.The design of the system fills the gap in palm print and palm vein recognition technology in the portable device and personal terminal markets.