Polarization coded aperture
Reads0
Chats0
TLDR
Two examples are presented to illustrate the advantages of polarization coded apertures, in which the incoming light will rotate its polarization at a portion of an aperture.Abstract:
Two examples are presented to illustrate the advantages of polarization coded apertures, in which the incoming light will rotate its polarization at a portion of an aperture. In the first example the depth of field of a diffraction limited lens is increased without sacrificing the light throughput; in the second example the axial focal intensity of a pixelated Fresnel zone plate is increased by 100%. Both examples work for linearly polarized or unpolarized illumination.read more
Citations
More filters
Journal ArticleDOI
Computational Plenoptic Imaging
TL;DR: This state‐of‐the‐art report reviews approaches that optically encode the dimensions of the plenoptic function transcending those captured by traditional photography and reconstruct the recorded information computationally.
Proceedings ArticleDOI
Computational plenoptic imaging
TL;DR: The state of the art in joint optical modulation and computation reconstruction for acquisition of high-dynamic-range imagery and spectral information is discussed, and how much of this visual information is irreversibly lost in conventional image acquisition is shown.
Journal ArticleDOI
Design and fabrication of random phase diffusers for extending the depth of focus.
E. E. García-Guerrero,Eugenio Rafael Mendez Mendez,H. M. Escamilla,Tamara A. Leskova,Alexei A. Maradudin +4 more
TL;DR: It is found that the non-absorbing optical diffusers can be used as depth-of-focus extenders and the three-dimensional distribution of the mean intensity in the neighborhood of focus is calculated.
Journal ArticleDOI
Punching holes in light: recent progress in single-shot coded-aperture optical imaging.
TL;DR: This review comprehensively surveys state-of-the-art single-shot coded-aperture optical imaging and provides two representative examples of active-encoded and passive-encoding approaches, with a particular emphasis on their methodology and applications as well as their advantages and challenges.
Journal ArticleDOI
Extending the depth of field through unbalanced optical path difference
TL;DR: A simple method to extend the depth of field of a conventional camera by inserting a transparent annular ring in front of the pupil of the lens by creating an unbalanced optical path difference across the lens aperture.
References
More filters
Journal ArticleDOI
Extended depth of field through wave-front coding
TL;DR: An optical-digital system that delivers near-diffraction-limited imaging performance with a large depth of field that is the standard incoherent optical system modified by a phase mask with digital processing of the resulting intermediate image.
Journal ArticleDOI
Diffraction Images in Systems with an Annular Aperture
E. H. Linfoot,Emil Wolf +1 more
TL;DR: In this article, the effects of central obstruction of the aperture on the three-dimensional light distribution near the focus of an aberration-free optical system were investigated and it was shown that when the central obstruction is large, the bright central nucleus becomes longer and narrower, so that focal depth and resolving power are both increased.
Journal ArticleDOI
Computational imaging with the logarithmic asphere: theory
Wanli Chi,Nicholas George +1 more
TL;DR: A theory for an integrated system is described that combines a logarithmic aspheric imaging lens with maximum-entropy digital processing to extend the depth of field ten times over that of a conventional lens and to provide near-diffraction-limited resolution.
Journal ArticleDOI
Optical/digital incoherent image processing for extended depth of field.
Ting-Chung Poon,Masoud Motamedi +1 more
TL;DR: A simple hybrid optical/digital image processing system in which a TV camera device is coupled with an annular aperture is considered and annular-pass filtering to compensate for the loss of contrast is performed by a digital computer.
Journal ArticleDOI
Gabor zone plate with binary transmittance values.
T D Beynon,I Kirk,T R Mathews +2 more
TL;DR: The measured optical properties of such a plate are shown to be in agreement with those of the idealized Gabor plate that possesses a radially sinusoidal transmittance function.