Iris imaging system and iris identification module

An imaging system and iris technology, applied in the field of biometric identification, can solve the problems of the overall length of the optical imaging system, the complex lens processing technology, and the small working distance range, and achieve the effects of good imaging quality, wide working distance range, and simple and compact structure.

Active Publication Date: 2019-05-21
SUZHOU SIYUAN KEAN INFORMATION TECH
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AI Technical Summary

Problems solved by technology

Compared with the iris imaging lens with two lens structures, the iris imaging lens with three lenses increases the degree of freedom in optical design. The use of aspherical lenses controls the spherical aberration of the optical imaging system to a certain extent and improves the imaging quality. Due to the complex lens processing technology, the overall length of the entire optical imaging system is too long and takes up a lot of space
[0004] Although liquid optics can better take into account the advantages of the above two systems, the previous liquid optics system has the following problems: the range of working distance has been expanded but still small, the image quality is poor, the image is dark, and the exposure under external light source long time, large size

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  • Iris imaging system and iris identification module
  • Iris imaging system and iris identification module
  • Iris imaging system and iris identification module

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Embodiment

[0040]Now take the iris imaging system embodiment of the present invention with working distances of 1000 mm, 612 mm, and 297 mm as examples to illustrate the actual effects that can be achieved.

[0041] When the working distance is 1000mm, from Figure 2a It can be seen from the figure that the MTF transfer function curve of the lens is compact and straight, all the field of view curves are less than 1 division on the ordinate axis corresponding to 80lp / mm, and the lowest MTF curve is greater than 0.5 at 80lp / mm. And with the Modulus of the OTF on the left (Modulus of the OTF) on the ordinate and the line pair frequency (Spatial frequency in cycles per mm) on the abscissa below, the area surrounded by the city is as large as possible, indicating that the system is in all fields of view. The imaging quality is excellent and consistent, and the iris image is overall uniform without particularly bad areas. from Figure 2b It can be seen that the field curvature of the imaging...

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Abstract

The invention discloses an iris imaging system comprising a front component, a zooming component and a rear component . The iris imaging optical system is an imaging system based on combination of a traditional optical system and a liquid optical system and has advantages of good imaging quality and low distortion characteristic in a close-distance working range. The diopter of the zooming component is changed by external voltage signal driving; and the automatic focusing is realized by combining the image intelligent algorithm. Moreover, the focusing speed is fast; and the service life is long. The imaging system has advantages of simple and compact structure, great convenience in debugging, and low cost.

Description

technical field [0001] The invention relates to the field of biological identification, in particular to an iris imaging system and an iris identification module. Background technique [0002] Iris recognition belongs to the field of biometrics. It is a biometric technology based on the iris of the eye. The iris image texture information collected by the optical system is processed to authenticate the user's identity. Compared with other biometric technologies such as fingerprints, it has significant advantages such as non-contact and good stability, and has become one of the most accurate identification technologies in current identity features. The difficulty in implementing iris recognition technology lies in how to collect clear and high-quality iris images under the premise of comfort for different users. Therefore, the optical system for collecting high-quality iris images becomes the key to iris recognition equipment. [0003] The existing iris collection optical sys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B3/14G02B15/00G06K9/00
Inventor 倪蔚民吴锦昇
Owner SUZHOU SIYUAN KEAN INFORMATION TECH
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