Results 171 to 180 of about 8,441 (216)

Wavefront Coding Optical System Design

Integrated Computational Imaging Systems, 2001
In 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 with adaptive optics

SPIE Proceedings, 2015
We have implemented an extended depth of field optical system by wavefront coding with a micromachined membrane deformable mirror. This approach provides a versatile extension to standard wavefront coding based on fixed phase mask. First experimental results validate the feasibility of the use of adaptive optics for variable depth wavefront coding in ...
Temitope E. Agbana, Oleg Soloviev, Vitalii Bezzubik, Vsevolod Patlan, Michel Verhaegen, Gleb Vdovin   +5 more
openaire   +2 more sources

Wavefront decoding of trellis codes

Proceedings of 1995 IEEE International Symposium on Information Theory, 2002
A 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

Optimized restoration of wavefront coded images

SPIE Proceedings, 2014
Wavefront 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, Eva Acosta, Justo Arines, A. Padilla-Vivanco   +3 more
openaire   +1 more source

Wavefront coding for millimeter wave imaging

Frontiers in Optics, 2006
The 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, Mark Mirotznik, Joseph N. Mait, David Wikner, Joseph van der Gracht   +4 more
openaire   +1 more source

Joint fractional Fourier analysis of wavefront-coding systems

Optics Letters, 2009
The analysis of wavefront-coding systems is explored via the joint fractional Fourier signal representation (JFF) of the pupil function. The properties of the JFF of the pupil function are presented and are shown to be revealing with regard to the system response to defocus. Numerical examples that illustrate the properties are given.
Shane, Barwick, Jerome S, Finnigan
openaire   +2 more sources

Extending depth-of-field: Spherical coding versus asymmetric wavefront coding

Frontiers in Optics 2009/Laser Science XXV/Fall 2009 OSA Optics & Photonics Technical Digest, 2009
We compare the image quality between asymmetric wavefront codings and the simple-to-manufacture spherical aberration over an extended focal range. We verify and explain the superior performance of the spherical aberration via simulation results.
Dirk Robinson, David G. Stork
openaire   +1 more source

Wavefront coding with Jacobi-Fourier phase masks

Current Developments in Lens Design and Optical Engineering XX, 2019
Wavefront coding is a hybrid optical-computational technique that makes use of a phase modulating element in conjunction with a deconvolution algorithm to extend the depth of focus of imaging systems. The phase mask codes the wave-front in such a way that the point-spread function do not change appreciably as a function of defocus.
Enrique González-Amador, Alfonso Padilla-Vivanco, Carina Toxqui-Quitl, Juan Miguel Olvera-Angeles, Justo Arines, Eva Acosta   +5 more
openaire   +1 more source

The Simulation of Wavefront Coding Imaging Systems

2007 IEEE International Conference on Integration Technology, 2007
In 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, null Li Jingzhen, Wu Qingyang, Wen Desheng   +3 more
openaire   +1 more source

Coded Shack-Hartmann Wavefront Sensor

2016
Wavefront sensing is an old yet fundamental problem in adaptive optics. Traditional wavefront sensors are limited to time-consuming measurements, complicated and expensive setup, or low theoretically achievable resolution. In this thesis, we introduce an optically encoded and computationally decodable novel approach to the wavefront sensing problem ...
openaire   +2 more sources