Method for validating a biometrical acquisition, mainly a body imprint

Abstract

The invention relates to a method for validating a biometrical acquisition, mainly the acquisition of a body imprint of a body area such as fingerprints or a face imprint, wherein the method involves together with the biometric acquisition: lighting the body area using at least one radiation having at least two respective different wavelengths between approximately 500 nm and 1150 nm; taking at least two reflectometry measurements concerning said and at least two wavelengths for measuring the reflection index of the tissues for these wavelengths; calculating the ratio for the two measured indices; and comparing the ratio with a range of reference values characterising a haemoglobin-containing living tissue in terms of proportions of oxygenated and non-oxygenated forms characteristic of the living state for the wavelengths in question; if the ratio is included in said range, the body area is considered as living and the biometrical acquisition is validated; and conversely, if the body area is considered as not living, the biometrical acquisition cannot be validated.

Description

field of invention [0001] This application relates generally to the field of biometric capture of an individual, and in particular to a body imprint of a part of an individual's body, especially a fingerprint or facial imprint on an individual, for example for the purpose of identifying or authenticating an individual, more particularly Involves technological improvements in the field. Background technique [0002] When deception occurs in the capture of body prints, particularly fingerprints, according to one aspect, the so-called "fake finger" technique can be used: the fraudster uses a finger that reproduces a body print that characterizes an individual. Fake fingers (or fake body parts). For example, the fake finger could contain an imitation of the entire finger provided for the reproduction of the body print that needs to be detected to characterize a given individual, or the fake finger could simply contain a The individual's fingerprint reproduces an apparently ide...

AI Technical Summary

Problems solved by technology

[0008] However, it is necessary to consider such precise information on the oxidation rate of arterial blood, but if the method of the present invention is applied, it is excessive in the case of obtaining the biometrics of the individual, since it may be possible to obtain the information accuracy, but is not necessary for obtaining biometric information; moreover, the acquisition time for useful information is too long and the implementation is rather complex (modulation of associated optical signals, multiple processing operations for extracting pulse information and falsification ), so this well-known solution cannot be used to perform a fast and economical biometric process

In addition, optical analysis in transmission mode is not suitable for the general form of biometric sensors currently applied

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