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, in parallel with the biometric capture proper the method comprising:
- said area of the body is illuminated using at least a radiation including at least two different respective wavelengths between about 500 nm and 1150 nm,at least two reflectometry measurements are carried out in relation to said at least two different respective wavelengths between about 500 nm and 1150 nm, so as to measure the reflection rate of the tissues of said body area for said at least two wavelengths,the ratio of these two measured rates is calculated, andthe calculated ratio of these two measured rates is compared with an interval of reference values of the proportion of oxygenated hemoglobin relative to the deoxygenated hemoglobin characterizing a living tissue for the wavelengths concerned,whereby, if said 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 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.
3 Assignments
0 Petitions
Accused Products
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.
22 Citations
26 Claims
-
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, in parallel with the biometric capture proper the method comprising:
-
said area of the body is illuminated using at least a radiation including at least two different respective wavelengths between about 500 nm and 1150 nm, at least two reflectometry measurements are carried out in relation to said at least two different respective wavelengths between about 500 nm and 1150 nm, so as to measure the reflection rate of the tissues of said body area for said at least two wavelengths, the ratio of these two measured rates is calculated, and the calculated ratio of these two measured rates is compared with an interval of reference values of the proportion of oxygenated hemoglobin relative to the deoxygenated hemoglobin characterizing a living tissue for the wavelengths concerned, whereby, if said 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 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)
-
Specification