Method of validating a biometric capture, notably a body print
First Claim
1. A method of validating biometric capture, in particular body print capture from an area of the body, in particular a fingerprint or face print, of an individual, wherein, in the area of the body provided with the biometric characteristic to be detected, the method comprising:
- illuminating said area of the body using at least a radiation including at least two different respective wavelengths between about 500 nm and 1150 nm,carrying out at least two reflectometry measurements in relation to said at least two different respective wavelengths between about 500 nm and 1150 nm, wherein it comprises the following stepsmeasuring a first reflection rate of the tissues of said body area at a first wavelength, said first reflection rate being the reflected power divided by the incident power,measuring a second reflection rate of the tissues of said body area at a second wavelength, said second reflection rate being the reflected power divided by the incident power,calculating the ratio of the first reflection rate and the second reflection rate, andcomparing the calculated ratio with an interval of reference values of the proportion of oxygenated hemoglobin relative to the deoxygenated hemoglobin, said interval of reference values characterizing a living tissue for the wavelengths of said radiation with which said area of the body has been illuminated,whereby, if said calculated ratio is within said interval, said area of the body is considered to be living and the biometric capture can be validated, or, if said calculated ratio is not within said interval, said area of the body is considered not to be living and the biometric capture may not be validated.
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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 two measured indices; and comparing the ratio with a range of reference values characterizing a haemoglobin-containing living tissue in terms of proportions of oxygenated and non-oxygenated forms characteristic of the living states 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.
16 Citations
26 Claims
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1. A method of validating biometric capture, in particular body print capture from an area of the body, in particular a fingerprint or face print, of an individual, wherein, in the area of the body provided with the biometric characteristic to be detected, the method comprising:
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illuminating said area of the body using at least a radiation including at least two different respective wavelengths between about 500 nm and 1150 nm, carrying out at least two reflectometry measurements in relation to said at least two different respective wavelengths between about 500 nm and 1150 nm, wherein it comprises the following steps measuring a first reflection rate of the tissues of said body area at a first wavelength, said first reflection rate being the reflected power divided by the incident power, measuring a second reflection rate of the tissues of said body area at a second wavelength, said second reflection rate being the reflected power divided by the incident power, calculating the ratio of the first reflection rate and the second reflection rate, and comparing the calculated ratio with an interval of reference values of the proportion of oxygenated hemoglobin relative to the deoxygenated hemoglobin, said interval of reference values characterizing a living tissue for the wavelengths of said radiation with which said area of the body has been illuminated, whereby, if said calculated ratio is within said interval, said area of the body is considered to be living and the biometric capture can be validated, or, if said calculated ratio is not within said interval, said area of the body is considered not to be living and the biometric capture may not be validated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification