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Spectral filtering as a method of visualising and removing striped artefacts in digital elevation data [PDF]
, 2008 Spectral filtering was compared with traditional mean spatial filters to assess their ability to identify and remove striped artefacts in digital elevation data. The techniques were applied to two datasets: a 100 m contour derived digital elevation model
Albani +51 more
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Optics Express, 2022 In this paper, directly following from Gage [J. Opt. Soc. Am.23,46(1993)10.1364/JOSA.23.000046], we study the design of a particular theoretical filter for photography, that we call the locus filter. It is built in such a way that a Wien-Planckian light (of any temperature) is spectrally mapped to another Wien-Planckian light.
Rada Deeb, Graham Finlayson
openaire +4 more sources
Wave disturbance filtering in dynamic positioning systems [PDF]
Modeling, Identification and Control, 1996 Three different approaches to wave disturbance filtering in dynamic positioning systems are studied in this paper. It is shown that a conventional design based on notch filters leads to approximately the same achievable performance of the total control ...
Tor S. Schei
doaj +1 more source
Implementation of Adaptive Unsharp Masking as a pre-filtering method for watermark detection and extraction [PDF]
, 2016 Digital watermarking has been one of the focal points of research interests in order to provide multimedia security in the last decade. Watermark data, belonging to the user, are embedded on an original work such as text, audio, image, and video and thus,
Ilk, Hakki Gokhan, Jane, Onur
core +2 more sources
Journal of Advances in Modeling Earth Systems, 2021 Identifying internal waves in complex flow fields is a long‐standing problem in fluid dynamics, oceanography and atmospheric science, owing to the overlap of internal waves temporal and spatial scales with other flow regimes. Lagrangian filtering—that is,
Callum J. Shakespeare +5 more
doaj +1 more source
Compressed air mechanical drying for railway branch of Europe [PDF]
Transport Problems, 2010 The up-to-date compressed air drying methods for necessities of different industrial branches are covered. In particular, the approved, reliable method of compressed air drying is suggested.
Leonid RIPOL’-SARAGOSI
doaj
Error Reduction in Vision-Based Multirotor Landing System
Sensors, 2022 New applications are continuously appearing with drones as protagonists, but all of them share an essential critical maneuver—landing. New application requirements have led the study of novel landing strategies, in which vision systems have played and ...
Juan Pedro Llerena Caña +2 more
doaj +1 more source
Manipulation Robustness of Collaborative Filtering Systems
, 2009 A collaborative filtering system recommends to users products that similar users like. Collaborative filtering systems influence purchase decisions, and hence have become targets of manipulation by unscrupulous vendors.
Van Roy, Benjamin, Yan, Xiang
core +4 more sources
A resistivity survey of phosphate deposits containing hardpan pockets in Oulad Abdoun, Morocco [PDF]
Geofísica Internacional, 2006 In the great Oulad Abdoun Basin exploitation of a new phosphate deposit was begun after the Grand Daoui horizon was exhausted. Inclusions of sterile hardpan—so-called “disturbances” —are hard to detect and interfere with phosphate extraction.
Saad Bakkali
doaj
Spatial frequency processing in the central and peripheral visual field during scene viewing
, 2016 Visuospatial attention and gaze control depend on the interaction of foveal and peripheral processing. The foveal and peripheral regions of the visual field are differentially sensitive to parts of the spatial-frequency spectrum.
Cajar, Anke +2 more
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