Results 161 to 170 of about 1,288 (199)
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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
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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
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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.
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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
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Joint fractional Fourier analysis of wavefront-coding systems
Optics Letters, 2009The 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
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Dynamic macroblock wavefront parallelism for parallel video coding
Journal of Visual Communication and Image Representation, 2015Detail performance analysis of the traditional macroblock row wavefront (MRW) parallelism.A new dynamic macroblock wavefront (DMW) parallelism.An efficient implementation of video encoder with DMW. Wavefront parallelism is effective for parallel video encoding thanks to its merits of low latency, no quality loss and high degree of parallelism.
Zhenyu Wang 0002 +4 more
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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
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Coded Shack-Hartmann Wavefront Sensor
2016Wavefront 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 ...
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Design of a single lens wavefront coded infrared camera
Applied OpticsWe present the design of a single lens infrared imaging system based on the wavefront coding approach. Spatially invariant PSF with consistent performance over the full field of view ±(4∘×3∘) and athermalization (−20∘C to +60∘C) is achieved in a compact single lens design by a combination of both lens bending and introduction of a generalized cubic ...
Mahendra Pratap Singh +3 more
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Wavefront Coded Microscope and Real-Time Processor
2002Abstract : A Wavefront Coded microscope and real-time processor were developed and tested Algorithms developed during this work lead to compact implementations yielding over 30 billion operations per second for reconstruction of a Wavefront Coded image Example results were obtained in the laboratory and provided in this ...
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