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Spatial filter

About: Spatial filter is a research topic. Over the lifetime, 6170 publications have been published within this topic receiving 100451 citations.


Papers
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Proceedings ArticleDOI
02 May 1993
TL;DR: A sensor system that measures the surface pattern of objects by using a spatial filtering tactile sensor that has a bandpass spatial filtering function and changes its center of spatial frequency with the tactile motion is described.
Abstract: A sensor system that measures the surface pattern of objects by using a spatial filtering tactile sensor is described. The sensor has a bandpass spatial filtering function and changes its center of spatial frequency with the tactile motion. The idea of this method is based on the nervous system in a human finger. This sensor system is characterized by robot measurement for nonuniform contact states, adaptability for a wide spatial frequency range in the surface pattern of objects, and high spatial resolution. The characteristics of the sensor are analyzed, an adaptive operation algorithm for identifying the surface pattern of objects is described, and simulation and experimental results are given. >

42 citations

Journal ArticleDOI
TL;DR: In this article, the authors investigate light propagation in the materials with periodically modulated gain-loss profile in both transverse and longitudinal directions with respect to the direction of light propagation.
Abstract: We investigate light propagation in the materials with periodically modulated gain-loss profile in both transverse and longitudinal directions with respect to the direction of light propagation. We predict the effects of self-collimation (diffraction-free propagation) of the beams, as well as the superdiffusion (spatial frequency filtering) of the beams depending on the geometry of the gain-loss lattice, and justify the predictions by numerical simulations of the paraxial wave propagation equations.

42 citations

Patent
31 Mar 1972
TL;DR: In this paper, a surface inspection system uses a highly focused spot of light moved rapidly over the surface to perform an inspection This permits a ready location of the defects, gives some indication as to their size, and permits a high resolution inspection to be performed in a relatively short time.
Abstract: A surface inspection system uses a highly focused spot of light moved rapidly over the surface to perform an inspection This permits a ready location of the defects, gives some indication as to their size, and permits a high resolution inspection to be performed in a relatively short time An optical arrangement is employed in which a scanned beam is brought back through the same lens system used in generating the scan to produce an immobilized return signal beam A stop or spatial filter is used on the return beam to permit only the light scattered from defects to reach a detector

42 citations

Journal ArticleDOI
TL;DR: The distortion tolerance and noise properties of the minimum average correlation energy filter are investigated in detail in this paper.
Abstract: A new SDF type correlation filter referred to as the minimum average correlation energy (MACE) filter has been recently described in the literature. In this paper, we experimentally address the distortion tolerance and noise properties of this filter. The MACE filter has attractive properties that include: easily detectable peaks, distortion invariance, simplified training set selection, solutions to input bias effects, performance in noise and real background clutter, and less clutter with its reduced number of training set images. Each of these properties is investigated in detail in this paper.

42 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202321
202265
202181
2020144
2019180
2018179