[특허]Liveness sensor

[미국특허] Liveness sensor 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G06K-009/00
출원번호	US-0177817 (2005-07-08)
등록번호	US-7440597 (2008-10-21)
발명자 / 주소	Rowe,Robert K.
출원인 / 주소	Rowe,Robert K.
대리인 / 주소	Townsend and Townsend and Crew LLP
인용정보	피인용 횟수 : 24 인용 특허 : 239

초록 ▼

Methods and systems are provided for biometric sensing. An illumination subsystem provides light at discrete wavelengths to a skin site of an individual. A detection subsystem receives light scattered from the skin site. A computational unit is interfaced with the detection system. The computational unit has instructions for deriving a spatially distributed multispectral image from the received light at the discrete wavelengths. The computational unit also has instructions for comparing the derived multispectral image with a database of multispectral images to identify the individual.

대표청구항 ▼

What is claimed is: 1. A sensor system comprising: an illumination subsystem disposed to provide light at a plurality of discrete wavelengths to a sample; a detection subsystem disposed to receive light scattered within tissue of the sample; and a computational unit interfaced with the detection subsystem and having: instructions for deriving spatially distributed multispectral characteristics of the received light at the plurality of discrete wavelengths; and instructions for determining a liveness state of the tissue from the derived spatially distributed multispectral characteristics. 2. The sensor system recited in claim 1 wherein the illumination subsystem comprises: a light source that provides the light at the plurality of discrete wavelengths; and illumination optics to direct the light to the skin site. 3. The sensor system recited in claim 2 wherein the light source comprises a plurality of quasimonochromatic light sources. 4. The sensor system recited in claim 3 wherein at least one of the quasimonochromatic light sources comprises an LED. 5. The sensor system recited in claim 3 wherein at least one of the quasimonochromatic light sources comprises a laser diode. 6. The sensor system recited in claim 1 wherein the illumination subsystem comprises: a broadband light source; and a filter disposed to filter light emitted from the broadband light source. 7. The sensor system recited in claim 6 wherein the broadband light source comprises an incandescent bulb. 8. The sensor system recited in claim 6 wherein the broadband light source comprises a glowbar. 9. The sensor system recited in claim 6 wherein the filter comprises a continuously variable filter. 10. The sensor system recited in claim 1 wherein the instructions for determining the liveness state of the tissue comprise: instructions for pixelating a spatial distribution of the derived spatially distributed multispectral characteristics; and instructions for performing a multivariate factor analysis on a matrix having entries in a first dimension corresponding to a pixel of a pixelated spatial distribution and having entries in a second dimension corresponding to one of the plurality of discrete wavelengths. 11. A method for determining a liveness state of a sample, the method comprising: illuminating the sample with light at a plurality of discrete wavelengths; receiving light scattered within tissue of the sample; deriving spatially distributed multispectral characteristics of the received light at the plurality of discrete wavelengths; and determining a liveness state of the tissue from the derived spatially distributed multispectral characteristics. 12. The method recited in claim 11 wherein illuminating the skin site comprises; providing light at the plurality of discrete wavelengths; and directing the light to the skin site. 13. The method recited in claim 12 wherein providing the light at the plurality of discrete wavelengths comprises generating the light as a plurality of quasimonochromatic beams. 14. The method recited in claim 12 wherein providing the light at the plurality of discrete wavelengths comprises: generating a broadband beam of light; and filtering the broadband beam. 15. The method recited in claim 14 wherein receiving the light comprises: angularly separating separate wavelength components of the received light; and directing the angularly separated wavelength components to a light detector. 16. The method recited in claim 11 wherein illuminating the skin site with the light comprises illuminating the skin site with the plurality of discrete wavelengths substantially simultaneously and with an identifiable encoding. 17. The method recited in claim 11 wherein illuminating the skin site with the light comprises providing the plurality of discrete wavelengths sequentially. 18. The method recited in claim 11 wherein the skin site comprises a volar surface of a fingertip. 19. The method recited in claim 11 wherein the skin site comprises a volar surface of a hand. 20. The method recited in claim 11 wherein determining the liveness state of the tissue comprises: pixelating spatial distributions of the derived spatially distributed multispectral characteristics; and performing a multivariate factor analysis on a matrix having entries in a first dimension corresponding to a pixel of a pixelated spatial distribution and having entries in a second dimension corresponding to one of the plurality of discrete wavelengths.

이 특허에 인용된 특허 (239) 인용/피인용 타임라인 분석

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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[미국특허] Liveness sensor 원문보기

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이 특허에 인용된 특허 (239) 인용/피인용 타임라인 분석

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