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Finger and palm print imaging system

An imaging system, palmprint technology, applied in instruments, character and pattern recognition, computer parts and other directions, can solve the problems of bulky equipment, high cost of vertebral body/cylinder prism, etc., achieve small size, light weight, good experience effect

Active Publication Date: 2015-07-08
深圳百迈技术有限公司
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

Therefore, although this technical solution reduces the cost, the cost of the pyramid / cylindrical prism is relatively expensive. In addition, the equipment volume is still very large

Method used

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  • Finger and palm print imaging system
  • Finger and palm print imaging system
  • Finger and palm print imaging system

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Embodiment Construction

[0044] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0045] The physical principle utilized by the embodiments of the finger and palmprint imaging system provided by the present invention is frustrated total internal reflection (FTIR, frustrated Total Internal Reflection), and its basic principles are as follows:

[0046] The incident light passes through the optically dense medium n 1 into the optically rarefied medium n 2 interface, if the incident angle θ 1 greater than the critical angle θ c , then all incident rays are reflected back to the original medium n 1 The phenomenon inside is called total reflection. Although under ordinary total reflection conditions, all light returns to the incident medium, but there is a phase change, that is, half-wave loss. And the ...

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Abstract

The invention discloses a finger and palm print imaging system which comprises a liquid cavity outer wall, a liquid cavity, a liquid cavity inner wall, a cavity, a reflector set, a light source and an imaging mechanism which are sequentially arranged. The liquid cavity is filled with transparent liquid, the reflector set is arranged in the liquid cavity, the light source is arranged in the cavity or the liquid cavity, and the imaging mechanism is arranged in the cavity. The outer surface of the liquid cavity outer wall is an acquisition surface and used for making contact with the palm with finger and palm prints to be acquired, and the liquid cavity outer wall and the liquid cavity inner wall are both made of the transparent material. Fixed angles are formed among the light source, the reflector set and the imaging mechanism, the relative positions of the light source, the reflector set and the imaging mechanism are unchanged, the light source, the reflector set and the imaging mechanism can synchronously move, and the imaging mechanism can synchronously acquire reflected light. A light path in the imaging system is characterized in that light emitted by the light source generates the reflected light on the acquisition surface making contact with the palm with the finger and palm prints to be acquired, the reflected light is reflected by the reflector set to enter the cavity, and then the finger and palm prints are acquired through the imaging mechanism. The finger and palm print imaging system has the advantages of being more compact in structure, small in size, low in weight and low in production cost.

Description

technical field [0001] The invention relates to the technical field of finger and palm print image acquisition, in particular to a finger and palm print imaging system. Background technique [0002] In recent years, with the rapid development of biometric technology and Internet technology, fingerprint recognition products have penetrated into daily work and life. Among them, the four-finger collector and the half-palm fingerprint collector are the mainstream products used in the fields of entry-exit and criminal investigation. As the requirements for security levels become higher and higher, the requirements for the acquisition capabilities of the collectors also increase, including image quality and acquisition area. [0003] In view of the requirements on image quality, the existing optical fingerprint collectors mainly realize high-contrast fingerprint images by adopting internal total reflection. Such as figure 1 As shown, it is a schematic diagram of the principle o...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06K9/20
Inventor 周飞
Owner 深圳百迈技术有限公司
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