Finger vein image acquisition device and method

Abstract

The invention provides a finger vein image acquisition device. The device comprises a light source for irradiating a finger, an imaging device for generating an image of finger veins, and a main controller communicating with the imaging device; the finger vein image generated by the imaging device is output to the main controller by a video output port to be processed; the main controller comprises a finger entry identifying unit, a finger position judging unit, a finger vein image brightness adjusting unit, a light source controller, a filter plate, an optical lens, a CMOS controller, an LED indicating lamp, and a display controller, wherein the light source controller is used for controlling the brightness of the light source; the filter plate is used for filtering stray visible light and placed blow the finger; the optical lens is arranged adjacent to the filter plate; the LED indicating lamp is used for displaying the putting position of the finger; and the display controller is used for controlling the on and off of the LED indicating lamp. The device and the method can automatically and quickly acquire the high-quality finger vein image with proper brightness and proper position.

Description

technical field [0001] The invention relates to a finger vein image collection method and device for personal identification. Background technique [0002] Human finger vein distribution patterns can be used to identify individuals. At present, human finger vein image collection generally adopts infrared light source to irradiate the finger and project it on the imaging device. Since the hemoglobin in the finger vein has a stronger absorption rate of infrared light than other tissues, the distribution map of the finger vein can be obtained on the imaging device. . However, due to the thickness and thickness of each finger may be different, the placement position may be different each time, and the collected vein images may have fingers not in place, overexposure, and light leakage. Therefore, how to automatically collect high-quality finger vein images with appropriate brightness and position is a problem that must be solved by the finger vein recognition system. The exis...

AI Technical Summary

Problems solved by technology

However, due to the thickness and thickness of each finger may be different, the placement position may be different each time, and the collected vein images may have fingers not in place, overexposure, and light leakage. Therefore, how to automatically collect high-quality finger vein images with appropriate brightness and position is a problem that must be solved by the finger vein recognition system.

The existing finger vein image acquisition method or focus on the design of the acquisition device structure or the design of the light source control circuit does not mention this problem: such as Kono M et al. in Near-infrared finger vein patterns for personal identification, Applied Optics.2002 , 41(35): 7429-7436 proposed to avoid the problem of excessive infrared light by manually adjusting the brightness of the light source. Miura N et al. Feature extraction of finger-vein patterns based on repeated line tracking and its application to personal identification, Machine Vision and Applications.2004, (15): 194-203 proposed that the brightness of the light source can be automatically adjusted according to the brightness of the vein image, but there is no technical solution. Xie Jianbin and others proposed the design of the infrared light source control circuit in the patent ZL200620050963.3. They all It does not mention how to dynamically control the light source and guide finger placement according to the quality of the obtained vein image

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