Method and apparatus for extraction and matching of biometric detail

A biometric and detailed technology, applied in the field of biometric information identification of individuals, can solve the problems of difficulty in using databases, complicated matching processes, and inability to construct uniformly sorted fixed-length keys, etc., and achieve a simple and rapid matching process. Effect

Inactive Publication Date: 2009-12-02
SNOWFLAKE TECH CORP
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  • Application Information

AI Technical Summary

Problems solved by technology

Due to sensor noise and other adverse factors, there is no guarantee that the same set of points will be extracted each time an individual is authenticated / identified
Thus, such prior art methods must be flexible and take into account missing and extra point locations, which prevents them from constructing fixed-length keys that are always ordered in a uniform manner
As a result, the matching process is severely complicated and it becomes difficult to quickly search the vast database in the manner taught by the prior art

Method used

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  • Method and apparatus for extraction and matching of biometric detail
  • Method and apparatus for extraction and matching of biometric detail
  • Method and apparatus for extraction and matching of biometric detail

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Embodiment Construction

[2000] It is well known in the art that skin and some other body tissues reflect infrared light in the near-infrared range of approximately 700 to 900 nanometers, while blood absorbs radiation in this range. Thus, in video images of body tissue captured under infrared illumination, blood vessels appear as dark lines against the brighter background of the surrounding flesh. However, due to the reflective nature of subcutaneous fat, blood vessels that lie beneath large accumulations of this fat may be difficult or impossible to see when illuminated with direct light, that is, light that arrives from roughly a single direction.

[2010] When imaging regions of body tissue in the near-infrared range under highly diffuse infrared illumination, the contrast between blood vessels and surrounding flesh is significantly higher than when the tissue is viewed under direct infrared illumination. It appears that most of the diffuse infrared light reflected by the subcutaneous fat is direct...

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Abstract

A method and apparatus of identification by extracting and matching biometric detail from a subcutaneous vein infrared image. The image's Region of Interest is identified and artifacts are removed. A bank of filters, such as Symmetric Gabor Filters, Complex Gabor Filters, Log Gabor Filters, Oriented Gaussian Functions, or Wavelets, filters the image into a set of key value images that are subdivided into regions. An enrollment key, defined by ordered statistical measures of pixel intensities within the regions, is compared using a distance metric to a stored verification key. Various statistical measures may be used, such as variance, standard deviation, mean, absolute average deviation, max value, min value, max absolute value, median value, or a combination of these statistical measures. Various distance metrics may be used, such as Euclidean, Hamming, Euclidean Squared, Manhattan, Pearson Correlation, Pearson Squared Correlation, Chebychev, or Spearman Rank Correlation.

Description

technical field [0015] The present invention relates generally to identifying individuals using biometric information, and more particularly to identifying and authenticating individuals using images of subcutaneous veins. From a technical point of view, the present invention proposes a method for identifying an individual by extracting and matching biometric details from an infrared image of a person's subcutaneous veins. Background technique [0020] Biometrics refer to identification or identification based on physical or behavioral characteristics. Biometrics are increasingly being used to provide positive identification with a high degree of confidence, often through 1:1 (one-to-one) identification or 1:n ( One-to-many) matching / identification to identify and / or authenticate an individual using biometric information. It should be understood that, as used herein, the term "identify" refers to both authentication (confirming that a person is who they claim to be) and ide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06F21/32G06V40/14
CPCG06K9/00G06K2009/00932G06V40/14G06F18/00
Inventor P·M·梅内恩
Owner SNOWFLAKE TECH CORP
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