Results 121 to 130 of about 1,330 (167)
Some of the next articles are maybe not open access.
Compact vortex wavefront coding camera
Computational Imaging V, 2020We experimentally design, construct and test a compact optical system featuring a vortex diffractive waveplate placed in the aperture stop of the lens system. The wavefront coding camera diffracts polarized coherent illumination in the system's focal plane and reduces the peak intensity of the beam by two orders of magnitude while simultaneously ...
Kyle Novak, Abbie T. Watnik
openaire +1 more source
Wavefront decoding of trellis codes
Proceedings of 1995 IEEE International Symposium on Information Theory, 2002A novel reduced-complexity trellis decoding algorithm is described. The new algorithm, called wavefront decoding (WD), avoids the throughput bottleneck caused by metric and state-information feedback, which characterizes previously known breadth-first decoding algorithms.
openaire +1 more source
Widening the angle of view in wavefront coding
2015 20th Microoptics Conference (MOC), 2015The cubic phase mask is known to cause significant changes of point spread function (PSF) as the angle of view increases. view. Instead of the conventional on-axis PSF in the best focal plane, we utilized the arithmetic-average of PSFs at various angles of view to generate the deconvolution filter for wavefront coding, and confirmed that the effective ...
Yuka Uemura, Shinichi Komatsu
openaire +1 more source
The design of wavefront coded imaging system
SPIE Proceedings, 2016Wavefront Coding is a new method to extend the depth of field, which combines optical design and signal processing together. By using optical design software ZEMAX ,we designed a practical wavefront coded imaging system based on a conventional Cooke triplet system .Unlike conventional optical system, the wavefront of this new system is modulated by a ...
Shun Lan, Zhaofeng Cen, Xiaotong Li
openaire +1 more source
The Simulation of Wavefront Coding Imaging Systems
2007 IEEE International Conference on Integration Technology, 2007In the domain of reconnaissance, remote sensing, etc., people want to get high resolution images. There is a conflict between the resolution and the optical system defocus. In order to acquire high resolution images, some methods are taken to minish the defocus, but these ways affect the cost and weight of the system.
Hui Bin +3 more
openaire +1 more source
Optimized restoration of wavefront coded images
SPIE Proceedings, 2014Wavefront coding (WFC) uses a special aspheric optics and digital image processing to extend the depth of focus in imaging systems. An intermediate blurred image is generated by the spatial convolution of the image with the point spread function (PSF) of a cubic phase mask. Restoration tests are performed on an optically encoded image.
C. Toxqui-Quitl +3 more
openaire +1 more source
Catastrophes in wavefront-coding spatial-domain design
Applied Optics, 2010Spatial-domain design for wavefront-coding systems frequently simplifies the defining oscillatory integral of the point spread function (PSF) by means of the stationary phase approximation (SPA). Although the SPA applies over much of the support of the PSF, it tends to break down at or near the regions of highest intensity.
openaire +2 more sources
Wavefront coding for millimeter wave imaging
Frontiers in Optics, 2006The large numerical apertures employed in millimeter wave imaging are necessary for light gathering and resolution, but result in limited depth-of-field. We explore wavefront coding to extend the depth-of-field and examine effects on system performance.
Gregory Behrmann +4 more
openaire +1 more source
Wavefront Coding Optical System Design
Integrated Computational Imaging Systems, 2001In this paper a new technique for a new optical/digital system design is discussed. Wavefront Coding method is used to incorporate commercial optical/design software and custom-built software package to optimize digital imaging.
Inga A. Prischepa, Edward R. Dowski
openaire +1 more source
Wavefront-coding technique for inexpensive and robust retinal imaging
Optics Letters, 2014We propose a hybrid optical-digital imaging system that can provide high-resolution retinal images without wavefront sensing or correction of the spatial and dynamic variations of eye aberrations. A methodology based on wavefront coding is implemented in a fundus camera in order to obtain a high-quality image of retinal detail.
Justo, Arines +4 more
openaire +2 more sources