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Reflective digital holographic fingerprint imaging device

A digital holography and imaging device technology, applied in image communication, character and pattern recognition, television, etc., can solve the problems of high price, toxic gas, damage to the original condition of physical evidence, etc., and achieve the effect of non-destructive measurement

Inactive Publication Date: 2012-05-02
BEIJING UNIV OF TECH
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Problems solved by technology

After more than a century of exploration and practice, the fingerprint display technology has made great progress, but there are still unresolved problems, such as dust in the brush display method, toxic gas produced by the fumigation method, and some reagents and dyes are toxic. The colored substances will destroy the original condition of physical evidence, and some display reagents such as DFO (1,8-diazofluoren-9-one) are expensive

Method used

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  • Reflective digital holographic fingerprint imaging device
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  • Reflective digital holographic fingerprint imaging device

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Embodiment Construction

[0016] 1, composition structure of the present invention

[0017] The principle diagram of the digital holographic fingerprint acquisition imaging system device of the present invention is as follows figure 1 shown. The digital holographic fingerprint acquisition and imaging system of the present invention includes: a 50mW green solid-state laser with a central wavelength of 532nm, a continuous attenuation sheet, which is a dielectric film that can continuously attenuate the green laser light intensity, two and a half pieces Wave plate, a polarizing beam splitting prism, a polarizing beam splitting prism is a dielectric film that can reflect and transmit the green laser light intensity, two total reflection mirrors, the total reflection mirror is a medium that can reflect 100% of the green laser light Diaphragm, two beam expansion filter systems, the beam expansion filter system is a beam expansion optical system that can expand the diameter of the green laser beam, which bel...

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Abstract

The invention relates to a digital holographic device, in particular to a fingerprint acquisition and imaging device applied in the field of police. Aiming at the problems of poisonous detection and damage of the original state of physical evidences, which exist in the latent fingerprint appearing technology, the invention provides the non-contact digital holographic fingerprint acquisition device with nondestructive measurement, the device comprises a laser, a continuous attenuation piece, a half-wave plate, a polarization beam splitter prism, a completely reflecting mirror, a beam scattering filter system, a beam combination prism, a CCD (Charge Coupled Device) image sensor and a computer. The reflective digital holographic fingerprint imaging device disclosed by the invention can carry out acquisition for many times without destroying fingerprints, so that the problem of insufficient site fingerprint acquisition in the traditional criminal investigation can be solved, and extra information-phase information is provided for acquiring fingerprint information texture. The reflective digital holographic fingerprint imaging device has a practical significance for the fingerprint acquisition in the field of police.

Description

Technical field: [0001] The invention relates to a digital holographic device, in particular to a fingerprint collection and imaging device in the police field. Background technique: [0002] With the great progress of computer processing power and the application of automatic fingerprint recognition, fingerprint recognition technology has been widely used in people's life. One of the most critical issues in fingerprint identification technology is the display technology of latent fingerprints. If the fingerprints left at the crime scene cannot be effectively displayed, subsequent information extraction and fingerprint identification cannot be performed. At present, there are many kinds of fingerprint display technologies used in criminal investigation scenes. According to the principle of color rendering, they can be divided into: background color display, chemical reaction display, physical and chemical effect display, and laser display method. After more than a century o...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06K9/20A61B5/117H04N5/225G03H1/12A61B5/1172
Inventor 罗婷王云新王大勇赵洁张亦卓
Owner BEIJING UNIV OF TECH
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