Study Of Non-contact Multi-spectral Hand Imaging Acquisition System

With the rapid development of modern society, and we gradually focus on identitysecurity, everyone identification technology also have higher requirements, single-modalbiometrics has its limitations, has failed to meet the needs of the people. So we designed acollection system through non-contact manner of hand image, the role of the plane of the lightsource, to collect the hand feature images together, identified by embedding algorithms. Theset of hand-imaging acquisition device greatly reduces the user identification error rate, has abroad application prospect in the community, the praise of users.The system adopts the470nm wavelength is blue and near infraredwavelength is850nm as the main light source, by comparison experiment, the light source system by way of a series consisting of collected palm vein and the effect is the best. The entire system by way of palm and lighting systems collect non-contact hand image after image acquisition hand finished, extract feature information of the hand, and then combinedwith feature recognition algorithm for identification.In this paper, the TMS320DM6437DaVinci core, obtained by TVP5146video decoderchip collection interval for palm, palm, palm vein image of23ms, and through the screendisplay. The design of the hardware circuit section includes a palm image capture needs lightcircuit, palm image acquisition part, hand recognition feature information showed someperipheral circuits and auxiliary circuit modules, the software part includes a light sourcemodule initialization, TMS320DM6437inside the device, initialization CMOS image sensor,the display module driver, voice module initialization, decision algorithm defining the palmregion and the recognition algorithm module.The design by the blue and near-infrared light source composed of a system, the systemcollected by CMOS image sensor palm, palm and palm vein image, the captured image istransferred to the palm TMS320DM6437in processing, will first go through the video decoderTVP5146, it the main role here is to complete the analog-digital conversion, after a series oftreatments will transmit image data processing to the video processing front endTMS320DM6437are processed, the system will enter through the processing of the imagedata stored in the DDR2cache, TMS320DM6437video processing backend will read the datain the DDR2, after processing the image to the LCD screen will be displayed by the LCD screen can be seen to the palm image capture main texture is very clear, high-contrast images,you can to complete the identification of the exact identity of the user.