Comparative texture analysis of tissue for biometric spoof detection
AssigneeLumidigm, Inc.
InventorRobert K. Rowe
Life of this patent
Estimating the term…
Abstract
Methods are described of evaluating the genuineness of a sample presented for biometric evaluation. The sample is illuminated under distinct optical conditions. Light scattered from the sample is received. Multiple images are formed, each image being formed from the received light for one of the optical conditions. A set of texture measures is generated, each texture measure being generated from one of the images. It is determined whether the generated texture measures is consistent with the sample being authentic unconcealed biological tissue.
Claims21
A method of evaluating genuineness of a sample presented for biometric evaluation, the method comprising:
- illuminating with illumination optics the sample with light having a plurality of different wavelengths;
- receiving via detection optics light scattered from the sample for each of the plurality of distinct optical conditions;
- forming a plurality of images, each such image being formed from the received light for a respective one of the plurality of distinct optical conditions;
- and
- analyzing the plurality of images using a computational device, wherein the analyzing comprises:
- generating a plurality of texture measures, each such texture measure being generated from a respective one of the plurality of images;
- and
- determining whether the generated plurality of texture measures is consistent with the sample being authentic unconcealed biological tissue.
A method of evaluating genuineness of a sample presented for biometric evaluation, the method comprising:
- illuminating with illumination optics the sample with light having a plurality of different wavelengths;
- receiving via detection optics light scattered from the sample for each of the different wavelengths;
- forming a plurality of images, each such image being formed from the received light for a respective one of the different wavelengths;
- and
- analyzing the plurality of images using a computational device, wherein the analyzing comprises:
- generating a plurality of image contrast measures, each such image contrast measure being generated from one of the plurality of images by performing a spatial moving-window analysis of the one of the plurality of images;
- and
- determining from the plurality of image contrast measures whether the sample has an image contrast under red illumination that is less than an image contrast under blue illumination.
An apparatus for evaluating genuineness of a sample presented for biometric evaluation, the apparatus comprising:
- means for illuminating the sample with light having a plurality of different wavelengths;
- means for receiving light scattered from the sample for each of the plurality of distinct optical conditions;
- means for forming a plurality of images, each such image being formed from the received light for a respective one of the plurality of distinct optical conditions;
- means for generating a plurality of texture measures, each such texture measure being generated from a respective one of the plurality of images;
- and
- means for determining whether the generated plurality of texture measures is consistent with the sample being authentic unconcealed biological tissue.
Dependencies are inferred from the claim text.