상세정보
학술지
Analysis on Image Recovery for On-axis Digital Fresnel Hologram with Aliased Fringe Generated from Self-similarity of Point Spread Function
- 저자
- 채병규
- 발행일
- 202007
- 출처
- Optics Communications, v.466, pp.1-9
- ISSN
- 0030-4018
- 출판사
- Elsevier
- 협약과제
- 17HS2200, 고품질 생체정보 획득 분석을 위한 단층 이미징 및 인식 센서 기술 연구, 채병규
- 초록
- We analyze the aliasing phenomenon for on-axis digital Fresnel hologram with an enhanced numerical aperture (NA). The enhanced-NA digital hologram acquired computationally or optically at a closer distance from the object has an aliased fringe generated by undersampling process of the Fresnel prefactor. The point spread function known as Fresnel factor reveals a self-similar envelope when being sampled, which becomes a crucial mechanism in making this type of aliasing fringe of hologram. We describe that as the enhanced-NA hologram involves already the complementary aliased fringe that might come up in the reconstruction process, the robust recovery of object image can be realized. These behaviors are confirmed through numerical simulation. Based on the analysis of aliased hologram fringe, we provide a method for reconstructing the object image from the enhanced-NA digital Fresnel hologram without the shrinkage of image size.
- KSP 제안 키워드
- Digital hologram, Fresnel hologram, Image recovery, Numerical simulations, Object image, Point spread function(PSF), image size, numerical aperture, on-axis, reconstruction process, self-similarity