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Latent fingerprint label-free Stokes parameter polarized confocal microimaging system and method

A confocal microscopic imaging and marking-free technology, which is applied in the direction of polarization-affected characteristics, can solve the problems of complicated operation and fingerprint damage, and achieve the effect of improving fingerprint recognition, avoiding damage, and rich texture details

Inactive Publication Date: 2018-12-11
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the general traditional polarization imaging method is complicated to operate, and the sample still needs to be treated with gold, silver and other metal powders before some experiments, which will inevitably cause damage to fingerprints.

Method used

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  • Latent fingerprint label-free Stokes parameter polarized confocal microimaging system and method
  • Latent fingerprint label-free Stokes parameter polarized confocal microimaging system and method
  • Latent fingerprint label-free Stokes parameter polarized confocal microimaging system and method

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Embodiment 1

[0051] see figure 1 , which is a schematic diagram of the imaging scanning experiment performed by the label-free Stokes parametric polarization confocal microscopy imaging system of the latent fingerprint in this embodiment. The system includes:

[0052] The polarization generation module 10 includes a laser 11 and a polarizer P5; the laser light emitted by the laser 11 generates polarized light through the polarizer P5. The laser 11 is preferably a helium-neon laser.

[0053] Confocal scanning module 20, it comprises objective lens L6, displacement stage 21 and lens L0; The polarized light that the polarizer P5 of polarization generation module 10 produces is incident on fingerprint sample Q through objective lens L6 focusing, and described displacement stage 21 is preferably precision displacement The station (PI, E664.S3) realizes XY scanning on the fingerprint sample Q, and after passing through the fingerprint sample Q, the outgoing light carrying the fingerprint infor...

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Abstract

The invention discloses a latent fingerprint label-free Stokes parameter polarized confocal microimaging system and method. The system comprises a polarization generation module, a confocal scanning module, a polarization measurement module and a data collection imaging module. According to the system, fingerprint polarization scanning imaging is carried out based on Stokes parameter measurement,and Stokes parameter and polarized parameter fingerprint images can be obtained after a monochromatic plane polarized light passes through an object printed with fingerprint marks; the background brightness formed by transmission of an objected, such as a mirror, can be well reduced, so that the fingerprint has remarkable contrast with the background, the image background interference can be weakened, and the fingerprint differentiation degree can be improved; and the fingerprint image has rich texture details and shows clear featured details of primary feature, secondary feature and partial tertiary feature which is hard to observe in other fingerprint imaging methods. The method is simple and easy to operate, does not need processing on a fingerprint sample, and can avoid destroying fingerprints.

Description

technical field [0001] The invention relates to the technical field of latent fingerprint detection, in particular to a marking-free Stokes parametric polarization confocal microscopic imaging system and method for latent fingerprints. Background technique [0002] Latent fingerprints are the sweat and sebum secreted by the sweat pores and fat glands on the fingers all the time. When the finger touches and exerts force on an object, the sweat and oil on the finger are reflected on the traces of the fingerprint pattern. Latent fingerprints are easily overlooked because they cannot be directly observed, but they contain information about each person's unique dermis lines. By analyzing the overall morphological information of the mastoid lines on the latent fingerprint and the detailed features formed by the deflection of the mastoid lines, the classification and identification can be compared with the database samples to realize fingerprint identification and individual identi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/21
CPCG01N21/21
Inventor 吴泳波唐志列杜嘉萍朱明建李曼华
Owner SOUTH CHINA NORMAL UNIVERSITY
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