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Image acquisition system

An image acquisition system, technology for iris images, applied in the field of systems including multiple optical components

Active Publication Date: 2018-08-03
FOTONATION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, each camera employed includes the same optics, set to the corresponding focal length, so this system involves many of the disadvantages highlighted above

Method used

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Experimental program
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Embodiment Construction

[0028] Embodiments of the invention include a multi-optics single sensor image acquisition system comprising a cluster of fixed focus lenses mounted to an image sensor having parallel spaced apart optical axes. Each lens directs light to a specific area of ​​the sensor, where each lens is designed to provide a different field of view at a different fixed focal length, so that the iris area captured by each lens can have similar characteristics, such as size and resolution.

[0029] Each lens in the cluster may have a different entrance pupil diameter AS, and a different f-number F=AS / f. Each lens can focus at different distances. For example, when focusing at distance Z, the diffraction formulas NP and FP for near and far points can be used to calculate the desired average focal length Z for each lens in the cluster.

[0030]

[0031]

[0032] where δ=2λF 2 is the depth of field, and λ is the wavelength, which is typically 0.85 microns for cameras used for iris image a...

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PUM

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Abstract

An image acquisition system for acquiring iris images for use in biometric recognition of a subject includes an optical system comprising a cluster of at least 2 lenses arranged in front of a common image sensor with each lens optical axis in parallel spaced apart relationship. Each lens has a fixed focus and a different aperture to provide a respective angular field of view. The lens with the closest focus has the smallest aperture and the lens with the farthest focus has the largest aperture so that iris images can be acquired across a focal range of at least from 200mm to 300mm.

Description

technical field [0001] The present invention relates to an image acquisition system, in particular to a system comprising a plurality of optical assemblies each arranged to be capable of capturing a respective image of an iris area for use in biometric identification. Background technique [0002] Biometric recognition based on images of the iris area uses individual radial patterns in the iris. Image acquisition systems for such biometric identification need to resolve at least 2 lines per mm within the iris pattern in order to provide reliable identification of the subject. In mobile phones and smartphones in particular, two factors limit the immediate use of conventional lens systems: the mobile phone market strives to minimize overall camera cost; and making phone housings as thin as possible. [0003] It would be desirable to have a dedicated image acquisition system capable of capturing images of the iris region of the face of approximately the same size in sharp focu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/00G06K9/00
CPCG02B27/0075G06V40/19G06V40/193H04N23/10H04N23/11H04N23/56G02B3/0043G02B3/0056
Inventor P·科尔科兰P·比焦伊C·戴恩蒂A·戈恩查罗维
Owner FOTONATION LTD