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Correction algorithm for image distortion of optical fingerprint collector

A fingerprint collector and image distortion technology, applied in instruments, computing, computer parts and other directions, can solve the problems of optical fingerprint collector image distortion, optical fingerprint collector image distortion and other problems

Active Publication Date: 2010-09-29
凯迈(洛阳)电子有限公司
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Problems solved by technology

[0005] The purpose of the present invention arises from this, and proposes a correction algorithm for image distortion of an optical fingerprint collector, which solves the matching problem caused by image distortion of an optical fingerprint collector

Method used

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  • Correction algorithm for image distortion of optical fingerprint collector
  • Correction algorithm for image distortion of optical fingerprint collector
  • Correction algorithm for image distortion of optical fingerprint collector

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Embodiment Construction

[0016] The present invention will be further described now in conjunction with accompanying drawing:

[0017] The hardware environment that is used to implement the present invention is: the optical fingerprint collector that CAMA-e Shenzhen company produces, ACPIMultiprocessor PC-4400+ computer, 2.00GB memory, 64M graphics card; The software environment of operation is: Window XP, with C and MATLAB 6.5 The programming language can realize the method proposed by the present invention.

[0018] 1. Design image distortion control points

[0019] The distortion of the fingerprint image needs to be completed by measuring the distortion parameters of the optical fingerprint collector. The distribution of fingerprint feature points is random, so a square grid needs to be used instead of the measurement.

[0020] Use a square grid to align the fingerprint optical collector in the horizontal and vertical directions, collect a distorted image I(i, j), and its size is m×n, convert the ...

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Abstract

The invention relates to a correction algorithm for the image distortion of an optical fingerprint collector. Fingerprint images acquired by a traditional optical fingerprint collector more or less have different degrees of image distortion which is non-linear and easy to influence the matching effect. The correction algorithm for the image distortion of an optical fingerprint collector, which is disclosed in the invention, finishes image correction by deducing an image distortion function through a corresponding relation between distorted images acquired on the optical collector of square grids and grid control points of square grid images. Linear and non-linear distorted fingerprint images acquired by the optical fingerprint collector are corrected by the invention so that the same fingerprint can be accurately matched under homologous and nonhomologous conditions, and fingerprint images are propelled to develop towards a standardization direction.

Description

technical field [0001] The invention relates to image collection and matching in an automatic fingerprint identification system, belongs to the field of digital image processing and pattern recognition, and mainly relates to a correction algorithm for image distortion of an optical fingerprint collector. It is suitable for the matching process of the optical collector image and the plane printing fingerprint image in the computer automatic fingerprint identification system. Background technique [0002] Automated Fingerprint Identification System (AFIS), as an important biometric authentication technology, has been widely used in the market, especially in the field of public security, and the continuous market demand has further promoted the development of AFIS technology. The prerequisite for fingerprint identification is to obtain digital fingerprint images, which are mainly completed by various fingerprint collectors. Current fingerprint collectors mainly include optical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06K9/20G06K9/32
Inventor 范峰韩松峰陈大海孟卫华齐文钊史毅
Owner 凯迈(洛阳)电子有限公司
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