Results 21 to 30 of about 9,619,631 (286)

Quantisation Scale-Spaces [PDF]

open access: yes, 2021
To appear in A. Elmoataz, J. Fadili, Y. Queau, J. Rabin, L. Simon (Eds.): Scale Space and Variational Methods in Computer Vision.
openaire   +3 more sources

Three-Dimensional Ultrasonic Reverse-Time Migration Imaging of Submarine Pipeline Nondestructive Testing in Cylindrical Coordinates

open access: yesJournal of Marine Science and Engineering, 2023
Submarine pipelines are a safe and energy-efficient mode of gas transport. However, due to the complex manufacturing process and harsh operating environment, submarine pipelines are subject to fatigue cracks under long-term cyclic loading.
Daicheng Peng   +5 more
doaj   +1 more source

Derivatives in scale space [PDF]

open access: yes, 1996
Various derivatives (1st to 4th order) describe different signal characters in scale space: the first derivative represents signal variation which can be used for coding; the second derivative characterizes the size of signal local structure and can be used for adaptive smoothing; the third and fourth order derivatives relate zero-crossing(or other ...
Ge Cong, Songde Ma
openaire   +2 more sources

Global Distribution of Persistence of Total Electron Content Anomaly

open access: yesAtmosphere, 2019
To better understand the ionospheric morphology response to lithospheric activities, we study the global location preference of the positive and negative total electron content (TEC) anomalies persisting continuously for longer than 24 h at middle and ...
Yang-Yi Sun   +3 more
doaj   +1 more source

INTEGRATING SCALE AND SPACE IN 3D CITY MODELS [PDF]

open access: yesThe International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2012
This paper presents the problem of the current separate treatment of levels of detail in city models. We propose a solution, detail the main principles, and present our initial results on the approach.
J. Stoter   +3 more
doaj   +1 more source

Scale and space dependencies of soil nitrogen variability [PDF]

open access: yesNonlinear Processes in Geophysics, 2017
In this study, we use multifractal analysis, through generalized dimensions (Dq) and the relative entropy (E(δ)), to investigate the residual effects of fertigation treatments applied to a previous crop on wheat and grain biomass and nitrogen content ...
A. M. Tarquis   +7 more
doaj   +1 more source

Interest point detection and scale selection in space-time [PDF]

open access: yes, 2003
. Several types of interest point detectors have been proposed for spatial images. This paper investigates how this notion can be generalised to the detection of interesting events in space-time data.
Laptev, Ivan   +5 more
core   +1 more source

On the axiomatic foundations of linear scale-space : Combining semi-group structure with causality vs. scale invariance

open access: yes, 1996
The notion of multi-scale representation is essential to many aspects of early visual processing. This article deals with the axiomatic formulation of the special type of multi-scale representation known as scale-space representation.
Lindeberg, Tony
core   +2 more sources

SWIFF : space weather integrated forecasting framework [PDF]

open access: yes, 2013
This research has received funding from the European Commission’s FP7 Program with the grant agreement SWIFF (Project No. 2633430, swiff.eu). The KU Leuven simulations were conducted on the computational resources provided by the PRACE Tier-0 Project No.
Viviane Pierrard   +84 more
core   +1 more source

Three-dimensional hollow tubular structure of rocket chemical depletion [PDF]

open access: yesAtmospheric Chemistry and Physics
The rocket launch process causes a series of disturbances in the ionosphere, among which a typical phenomenon is the formation of ionospheric electron density depletions caused by chemical reactions involving rocket exhaust, known as Holes in the ...
C. Deng   +12 more
doaj   +1 more source

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