Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Design and Experiment of an Optical System using a Prism with a High Enough Refractive Index for Wet Fingerprint Identification

물 묻은 지문을 인식하기 위한 프리즘 광학계의 설계 및 실험적 고찰

  • Kang, Myung-Hoon (Department of Nano Systems Engineering and Institute for Nano Manufacturing, Inje University) ;
  • Kim, Jin-Su (Department of Nano Systems Engineering and Institute for Nano Manufacturing, Inje University) ;
  • Jung, Jin-Woo (Department of Nano Systems Engineering and Institute for Nano Manufacturing, Inje University) ;
  • Ko, Eun-Mi (Department of Nano Systems Engineering and Institute for Nano Manufacturing, Inje University) ;
  • Kim, Jae-Gu (Department of Nano Systems Engineering and Institute for Nano Manufacturing, Inje University) ;
  • Cho, Guan-Sik (Department of Nano Systems Engineering and Institute for Nano Manufacturing, Inje University) ;
  • Song, Han-Jung (Department of Nano Systems Engineering and Institute for Nano Manufacturing, Inje University) ;
  • Hwang, Jae-Mun (Hankook Computer Vision)
  • 강명훈 (인제대학교 나노시스템공학과, 나노매뉴팩처링 연구소) ;
  • 김진수 (인제대학교 나노시스템공학과, 나노매뉴팩처링 연구소) ;
  • 정진우 (인제대학교 나노시스템공학과, 나노매뉴팩처링 연구소) ;
  • 고은미 (인제대학교 나노시스템공학과, 나노매뉴팩처링 연구소) ;
  • 김재규 (인제대학교 나노시스템공학과, 나노매뉴팩처링 연구소) ;
  • 조관식 (인제대학교 나노시스템공학과, 나노매뉴팩처링 연구소) ;
  • 송한정 (인제대학교 나노시스템공학과, 나노매뉴팩처링 연구소) ;
  • 황재문 (한국컴퓨터비젼)
  • Published : 2007.12.25
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Abstract

We propose a design and analysis of an optical system using a prism with a high enough refractive index for wet fingerprint identification. Important parameters including the tilting angle($\beta$) of the $1^{st}$ image plane, an anamorphic distortion, and a tilt of image plane are considered in terms of the apex angle of the prism($\alpha$) and refractive index of the prism material. Our suggestion on refractive index and apex angle of the prism corroborates well with experimental results.

본 연구는 지문 인식 시스템 중에서 프리즘을 이용한 광학계의 설계에 대한 것이다. 이는 프리즘, 렌즈, 그리고 CMOS 이미지 센서(혹은 CCD) 등으로 구성되어 있는 광학계이다. 종래의 프리즘을 이용한 지문인식 광학계에서는 지문에 물이 묻어 있는 경우에 영상의 품질이 현저히 저하되는 문제점이 있다. 이 경우에 프리즘의 굴절률을 높임으로써 영상의 품질을 충분히 높일 수 있었다. 또한 프리즘과 렌즈를 사용함으로 인하여 발생하는 비대칭 축소 왜곡(anamorphic distortion)과 상면의 지를 최소화되는 프리즘 꼭지각 $\alpha$를 제안한다.

Keywords

References

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