Results 211 to 220 of about 13,696 (250)

A fast impulsive noise color image filter using fuzzy metrics

Real-Time Imaging, 2005
In this paper, the problem of impulsive noise reduction in multichannel images is addressed. A new filter is proposed on the basis of a recently introduced family of computationally attractive filters with a good detail-preserving ability (FSVF). FSVF is based on privileging the central pixel in each filtering window in order to replace it only when it
Samuel Morillas, Valentín Gregori, Guillermo Peris-Fajarnés, Pedro Latorre   +3 more
openaire   +1 more source

Design and Construction of a Compact Electrostatic Fast Impulse Current Generator

2005 IEEE Pulsed Power Conference, 2005
A new version of a very fast impulse current generator based on the use a floating electrode was designed and constructed. The "Roman generator" is an electrostatic generator able to produce lightning-like current derivatives, with amplitude in the order of kA.
O. Diazt, F. Roman
openaire   +1 more source

Solid Dielectric Material Influence on Fast Impulse Partial Discharge Behavior

2005 IEEE Pulsed Power Conference, 2005
The cumulative effect of partial discharges (PD) in solid dielectric materials can lead to insulation aging and reduction in dielectric breakdown stress levels. Partial discharge events are parasitic to power levels. This paper compares PD behaviors of four model solid dielectric materials with embedded electrodes exposed to single fast impulses ...
A. Wilder, W. Eickelberg, J. Wilder
openaire   +1 more source

Fast impulsive noise removal

IEEE Transactions on Image Processing, 2001
A generic n-dimensional filter with the primary purpose of eliminating impulsive-like noise is presented. This recursive nonlinear filter is composed of two conditional rules, which are applied independently, in any order, one after the other. It identifies noisy items by inspection of their surrounding neighborhood, and afterwards it replaces their ...
openaire   +3 more sources

Transformer Oil Breakdown Dynamics Stressed by Fast Impulse Voltages: Experimental and Modeling Investigation

IEEE Transactions on Plasma Science, 2014
Streamer and breakdown behavior of transformer oil under impulse voltage are investigated with experimental observations and simulation. The optical observation by using Intensified Charge-coupled Device (ICCD) fast snapshot technique indicates that streamer channel branching is of a stochastic nature.
Yuan Li, Ming Xiao Zhu, Hai Bao Mu, Jun Bo Deng, Guan Jun Zhang, Jouya Jadidian, Markus Zahn, Wei Zheng Zhang, Zhi Min Li   +8 more
openaire   +1 more source

Fast impulsive noise removal in color images

2013 IEEE International Conference on Image Processing, 2013
In the paper a novel switching filter based on the reduced ordering statistics, combined with the peer group concept is proposed. The new technique assigns to each pixel the sum of the distances to two closest neighbors and if the sum exceeds a specified threshold, then the pixel is declared as corrupted and replaced, otherwise it is retained. The main
openaire   +1 more source

Greedy steep slope finder: The fast impulsive noise rejection for compressed measurement image signals

2012 International Symposium on Intelligent Signal Processing and Communications Systems, 2012
Impulsive noise in a compressed measurement signal can be detected by the energy distribution of the reconstructed sparse signal. In this paper, the fast preprocessing for impulsive noise rejection for a compressed measurement image signal is proposed. An image is sparsified by octave-tree wavelet transform with db8 as the mother wavelet. The impulsive
Suwichaya Suwanwimolkul, Parichat Sermwuthisarn, Supatana Auethavekiat   +2 more
openaire   +1 more source

An original setup to measure grounding resistances using fast impulse currents and very short leads

Electric Power Systems Research, 2019
Abstract This paper presents a method for measuring grounding resistances, which is based on the use of fast impulse current and short leads on the auxiliary measurement circuits. Usually, the conductor length of the voltage and current circuits used in grounding resistance measurements may be quite long depending on the grounding characteristics ...
A.B. Lima, C.E.F. Caetano, J.O.S. Paulino, W.C. Boaventura, I.J.S. Lopes, C.F. Barbosa   +5 more
openaire   +1 more source

How do fast impulse CMEs related to powerful flares but unrelated to eruptive filaments appear and move?

Advances in Space Research, 2015
Abstract GOES-12/SXI and SDO/AIA data were used to examine the formation and initial stage of movement for several fast pulse ‘halo’-type coronal mass ejections (HCMEs) that were related to GOES M and X class flares but unrelated to solar filament eruptions.
Iu.S. Zagainova, V.G. Fainshtein
openaire   +1 more source

Si/Ge Avalanche Photodiodes-Based Electrical Comb-Line Generators and Photoreceivers for Very-Fast Impulse Radio Wireless Linking

IEEE Photonics Technology Letters, 2012
We demonstrate the novel operation of a Si/Ge-based avalanche photodiode (APD) for the direct generation of ultra-wideband (UWB) frequency comb lines for impulse radio (IR) wireless communication. By applying a dc bias (Vbias) over the breakdown voltage (Vbr) of the APD, the device can exhibit a significant resonant frequency without any optical signal
Jin-Wei Shi, Feng-Ming Kuo, Daoxin Dai, John E. Bowers   +3 more
openaire   +1 more source