نتایج جستجو برای: spatial aliasing

تعداد نتایج: 364732  

Journal: :IEICE Transactions 2014
Chuang Shi Hideyuki Nomura Tomoo Kamakura Woon-Seng Gan

(2014). Spatial aliasing effects in a steerable parametric loudspeaker for stereophonic sound reproduction. IEICE transactions on fundamentals of electronics, communications and computer sciences, E97-A(9), 1859-1866. or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any mat...

2003
Francesco Savelli

Two or more different entities that appear identical when observed in isolation are perceptually aliased. While the nature of perceptual aliasing is clearly general and its occurrence depends on the kind of entities and perceptual skills assumed, it originates a very practical problem when it comes to acquiring purposeful spatial representations, e.g., maps, of an unknown environment under expl...

2008
A. Cigada M. Lurati F. Ripamonti M. Vanali

In the scientific and industrial community a growing interest is nowadays devoted to sound source localization techniques. Among all the existing methods, the use of the beamforming algorithm in sound source localization problems is increasing, thanks to its many advantages if compared to the other available methods (Nearfield Acoustic Holography and Helmholtz Equation Least Square Method). The...

2007
Daniel Scherzer Stefan Jeschke Michael Wimmer

Shadow mapping suffers from spatial aliasing (visible as blocky shadows) as well as temporal aliasing (visible as flickering). Several methods have already been proposed for reducing such artifacts, but so far none is able to provide satisfying results in real time. This paper extends shadow mapping by reusing information of previously rasterized images, stored efficiently in a so-called histor...

Journal: :Journal of the Optical Society of America. A, Optics and image science 1987
N J Coletta D R Williams

In the extrafoveal retina, interference fringes at spatial frequencies higher than the resolution limit look like two-dimensional spatial noise, the origin of which has not been firmly established. We show that over a limited range of high spatial frequencies this noise takes on a striated appearance, with the striations running perpendicular to the true fringe orientation. A model of cone alia...

2009
Alireza Shapoury

Ultra Wideband Antenna Array Processing Under Spatial Aliasing. (August 2007) Alireza Shapoury, B.S., Shahid Beheshti University of Iran; M.S., Iran University of Science and Technology Chair of Advisory Committee: Dr. Erchin Serpedin Given a certain transmission frequency, Shannon spatial sampling limit defines an upper bound for the antenna element spacing. Beyond this bound, the exceeded amb...

2014
Bosun XIE Yang LIU

Ambisonics are a series of flexible sound reproduction systems that decompose and reconstruct sound field by each order approximation of spatial harmonics decomposition. Circular or spherical microphone array has been used for Ambisonics recording. For an array with given radius as well as given number and configuration of microphones, the spatial harmonics signals up to certain temporal freque...

Journal: :Vision Research 1996
Larry N. Thibos David L. Still Arthur Bradley

Psychometric performance was measured for contrast detection and spatial resolution tasks in foveal and peripheral vision. Objective evidence was obtained for a quantitative difference between resolution acuity and detection acuity in the peripheral field. These two types of spatial acuity differed by up to an order of magnitude (3 vs 30 c/deg at 30 deg eccentricity) and they varied with stimul...

ژورنال: فیزیک زمین و فضا 2018

Spatial aliasing is an unwanted side effect that produces artifacts during seismic data processing, imaging and interpolation. It is often caused by insufficient spatial sampling of seismic data and often happens in CMP (Common Mid-Point) gather. To tackle this artifact, several techniques have been developed in time-space domain as well as frequency domain such as frequency-wavenumber, frequen...

Journal: :Comput. Graph. Forum 2005
Nicholas Diakopoulos Peter D. Stephenson

In recent work, a set of line digitization algorithms based on the hierarchy of runs in the digital line has unified and generalized the iterative line-drawing algorithms used in computer graphics. In this paper, the additional structural information generated by these algorithms is leveraged to describe a run-based approach to draw anti-aliased line segments in which anti-aliased run-masks are...

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