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Surface plasma resonance based fingerprint image acquisition method

A surface plasmon and fingerprint image technology, which is applied in the field of biometrics, can solve the problems of blurred finger imaging, small package size, and high imaging capability, and achieve the effects of improving recognition accuracy, increasing operating speed, and good image quality

Inactive Publication Date: 2006-07-19
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this acquisition method is that it can withstand a certain degree of temperature change, good stability, and low cost; the disadvantage is that the imaging of sweaty and slightly swollen fingers is blurred and the acquisition effect is poor under strong light, which hinders the processing and processing of fingerprint images. Recognition poses a larger obstacle
The advantages of the semiconductor chip acquisition method are high resolution, good sensitivity, small package size, and low power consumption; the disadvantage is that the imaging area is small (less than 1 square inch), susceptible to electrostatic interference, and easy to wear
The advantage of the ultrasonic acquisition method is that it has high imaging ability and is not affected by the sundries on the skin; the disadvantage is that the price is relatively high, and it is still in the laboratory stage

Method used

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  • Surface plasma resonance based fingerprint image acquisition method
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  • Surface plasma resonance based fingerprint image acquisition method

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Effect test

Embodiment 1

[0015] figure 2 It is a schematic diagram of a fingerprint image collection system according to an embodiment of the present invention (wherein 1-laser, 2-beam expander lens group, 3-polarizer, 4-fingerprint, 5-prism, 6-gold film, 7-imaging lens group, 8-image sensor). The cover glass and the isosceles right-angle prism are strictly cleaned, and one side of the cover glass is uniformly plated with 2nm thick chromium, and then uniformly plated with a 50nm thick gold film 6, and the cover glass coated with gold film 6 is used as a sensor Sheet, paste the sensing sheet to the bottom of the isosceles rectangular prism 5 with cedar oil, which can be easily replaced. Both the cover glass and the isosceles right-angle prism are made of K9 glass material, the refractive index is 1.516, and the refractive index of cedar oil is 1.5148-1.5152, and the refractive index of the three is close. A helium-neon laser 1 with a power of 3 milliwatts and a wavelength of 632.8 nanometers is used...

Embodiment 2

[0017] The isosceles right-angle prism is strictly cleaned, and the bottom surface of the isosceles right-angle prism is uniformly plated with 2nm thick chromium, and then uniformly plated with 60nm thick silver. A semiconductor laser with a power of 2 milliwatts and a wavelength of 635 nanometers is used as the light source. The laser beam is expanded by a beam expander lens group, collimated into a parallel beam with a circular cross-section with a diameter of about 15 mm (traditional methods can be used for beam expansion and collimation), and then passed through a polarizer (Glan-Taylor polarization Prism or Wollaston polarizing prism or Nicol polarizing prism) polarization is the polarized light whose vibration direction is parallel to the incident surface, and is incident on the bottom surface of the isosceles rectangular prism, and the prism (the prism has at least one bottom surface that can form a full spectrum in air) Reflecting prism) has a right-angled side length o...

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Abstract

The invention discloses a finger mark image collecting method based on surface plasma resonance phenomenon. The light beam from the light source aligns to an imitation collimated light beam after the beam expanding by the beam expanding lens group and then it becomes to a polarized light whose vibrating direction is parallel to the incident face, the polarized light then incidents to a step lens which projects it to the mental film, it presses the finger mark on the mental film or prints the marking ink on the mental film, the reflecting light imaging the image on the image sensor by an image lens set, the image sensor collects the finger mark image of the reflecting light beam.

Description

technical field [0001] The invention belongs to the technical field of biological identification, and in particular relates to a fingerprint image collection method based on the phenomenon of surface plasmon resonance. Background technique [0002] Fingerprint recognition technology is currently the most convenient, reliable, non-invasive and cheap biometric technology, and has a huge application market. At present, the collection methods of fingerprint images mainly include the following categories: optical total reflection method, semiconductor chip method and ultrasonic method. Optical total reflection fingerprint image collection is the most widely used method at present. It directly collects fingerprint images on glass or prisms. The basic principle is based on the principle of total reflection of light: The interface between glass and air undergoes total reflection, and the light is reflected to the image sensor, but the light that hits the fingerprint ridge does not ...

Claims

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Application Information

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IPC IPC(8): G06K9/20
Inventor 钟金钢李莹
Owner JINAN UNIVERSITY
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