1,165 Hits in 3.7 sec

Pulsed-waveform generator based on coupled oscillators

Mabel Ponton, Almudena Suarez
2014 2014 IEEE MTT-S International Microwave Symposium (IMS2014)  
The maximum propagation frequency through the NLTL is calculated with a realistic numerical technique, which enables an optimized design.  ...  Waveform sharpening in nonlinear transmission lines (NLTL) is analyzed in detail and applied to the design of a pulse-generator based on two coupled oscillators.  ...  With L = 0.3 nH, the response to a ramp input is shown in Fig. 2(a) , where the reduction of the wave rise time as it propagates through the NLTL cells can be noted.  ... 
doi:10.1109/mwsym.2014.6848471 fatcat:io2fefu2a5acta7h2tf7zfsr5u

Temperature Difference Between Gas Species In Absorption Measurements Using Diode Laser Absorption Spectroscopy And The Effect On Temperature Reduction

Akira Kuwahara
2021 Atomic spectroscopy  
However, there remains a considerable uncertainty regarding the significant temperature reduction compared with the temperature of argon atoms at the edge of the supersonic plasma jet, which is at 790  ...  The spectral resolution for the detection of slight shifts can also be enhanced by a temperature reduction using adiabatic expansion.  ...  addition to temperature reduction.  ... 
doi:10.46770/as.2021.006 fatcat:r4vvmgbxmzgkxlxx4cp7aq75sy

Adaptive Edge Enhancing Technique of Impulsive Noise Removal in Color Digital Images [chapter]

Bogdan Smolka
2011 Lecture Notes in Computer Science  
In this paper a novel class of noise attenuating and edge enhancing filters for color image processing is introduced and analyzed.  ...  Therefore it can be used in any application in which simultaneous denoising and edge enhancement is a prerequisite for further steps of the color image processing pipeline.  ...  The ability of the GVMG to remove impulses while sharpening the color image edges by reducing their width is also depicted in Fig. 5 which exhibits the row 60 of the blue channel of color test image  ... 
doi:10.1007/978-3-642-20404-3_5 fatcat:mknpg6rdxrcb3amudvufpuqgae

Interaction of ON and OFF pathways for visual contrast measurement

Heiko Neumann, Luiz Pessoa, Thorsten Hansen
2008 Biological cybernetics  
Ramp edge response A ramp edge pro®le of height h and width is de®ned by f ramp u h Á Hu P u X 19 where P u denotes a ®nite pulse of width .  ...  2 3 X 21 This shows that there exists an optimum scale for processing a ramp edge of a priori unknown width and height.  ...  In the case of discrete signals and images, any transitions are of unit width at minimum, i.e., P1.  ... 
doi:10.1007/s00422-008-0225-1 fatcat:ywwaswnlxrbxphcklno247wqwm

Interaction of ON and OFF pathways for visual contrast measurement

Heiko Neumann, Luiz Pessoa, Thorsten Hanse
1999 Biological cybernetics  
Ramp edge response A ramp edge pro®le of height h and width is de®ned by f ramp u h Á Hu P u X 19 where P u denotes a ®nite pulse of width .  ...  2 3 X 21 This shows that there exists an optimum scale for processing a ramp edge of a priori unknown width and height.  ...  In the case of discrete signals and images, any transitions are of unit width at minimum, i.e., P1.  ... 
doi:10.1007/s004220050580 pmid:10592025 fatcat:itg3ts2wj5hyteaxpkdyqfdzku

Mach Bands: How Many Models are Possible? Recent Experimental Findings and Modeling Attempts

1996 Vision Research  
Mach bands are illusory bright and dark bands seen where a luminance plateau meets a ramp, as in half-shadows or penumbras.  ...  ~For example, Fry (1948) introduced a "frequency-equalizing" mechanism having as one of its functions the reduction of brightnessgradients adjacent to sharp edges.  ...  Therefore, with their set-up, ramp widths of less than around 7.5 arcmin produced no Mach bands.  ... 
doi:10.1016/0042-6989(95)00341-x pmid:8917780 fatcat:qbyg5lh7kzad3fixqhwpq3obry

Many-body localization protected quantum state transfer [article]

Norman Y. Yao, Chris R. Laumann, Ashvin Vishwanath
2015 arXiv   pre-print
For a finite SPT region of length , the two edge qubits interact with each other through their exponentially localized tails.  ...  All numerics are performed using a box distribution with mean and width shown in the figure. (a) Depicts the static coherence time of the edge qubit, which grows exponentially with system size.  ... 
arXiv:1508.06995v1 fatcat:gpdythlaezfxlaigsfs3igw4gi

Edge-enhancing nonlinear filter for reducing multiplicative noise

Mark A. Schulze, Edward R. Dougherty, Jaakko T. Astola
1997 Nonlinear Image Processing VIII  
Therefore, the MCV filter is a good choice for reducing speckle without blurring edges.  ...  This paper illustrates the design of a nonlinear filter for edge-enhancing smoothing of multiplicative noise using a morphology-based filter structure.  ...  When an MCV filter with a structuring element of width 9 is applied to this signal, the edge is sharpened significantly.  ... 
doi:10.1117/12.271141 fatcat:bua47cepbfdw3pvrt22rxbihje

Consequences of Broad Auditory Filters for Identification of Multichannel-Compressed Vowels

Pamela Souza, Richard Wright, Stephanie Bor
2012 Journal of Speech, Language and Hearing Research  
The filter widths were related to identification of vowels processed with 16-channel MCC and with a control (linear) condition.  ...  Listeners with flat loss made more errors than listeners with sloping loss, and there was a significant relationship between filter width and the effects of MCC.  ...  The notch width was defined as the deviation of each edge of the central notch from the center frequency (f c ), and was denoted as Δ f / f c .  ... 
doi:10.1044/1092-4388(2011/10-0238) pmid:22207696 pmcid:PMC3320671 fatcat:xa2l2huetbchhlewbvfx74wmge

Noise reduction in PET attenuation correction by maximum likelihood histogram sharpening of attenuation images

J C Price, S L Bacharach, N Freedman, R E Carson
1996 Journal of Nuclear Medicine  
METHODS Scans were acquired on a Posicam 6.5 (Positron Corp., Houston, TX) whole-body PET scanner (in-plane resolution: 6.3 mm FWHM (ramp filter), axial slice width: 12.5 mm FWHM).  ...  The bin width in the projection array was the same as the pixel width in the attenuation image.  ... 
pmid:8965146 fatcat:ncne6dcn4jexdmhqt64oe77ivq

Image Sharpening Detection Based on Difference Sets

Dongping Wang, Tiegang Gao, Yuan Zhang
2020 IEEE Access  
INDEX TERMS Image sharpening, sharpening detection, difference sets, image forensics.  ...  Image sharpening is one of the basic operations used to improve the visual effect of images.  ...  It can be seen that the relationship between the separated pixels is also changed in sharpened images through the EPTC and EPBC algorithms, as well as the principle of the sharpening operation.  ... 
doi:10.1109/access.2020.2980774 fatcat:f6xuwx6qsna63kcsckrgyd2fa4

Texture-based measurement of spatial frequency response using the dead leaves target: extensions, and application to real camera systems

Jon McElvain, Scott P. Campbell, Jonathan Miller, Elaine W. Jin, Francisco Imai, Nitin Sampat, Feng Xiao
2010 Digital Photography VI  
Unlike the traditional knife-edge target, the SFR derived from the dead leaves target will be penalized for systems that employ aggressive noise reduction.  ...  It is well known that the knife edge approach, and to a lesser degree the Siemens Star method, are susceptible to adaptive sharpening and noise reduction algorithms and can therefore produce results that  ...  This is particularly true for the large fraction of images that contain structure with low contrast edges such as facial regions and foliage, where overly aggressive noise reduction may result in an objectionable  ... 
doi:10.1117/12.838698 dblp:conf/dphoto/McElvainCMJ10 fatcat:zoh52hcgjfguldcer2gocvnr6i

Mach bands and multiscale models of spatial vision: The role of first, second, and third derivative operators in encoding bars and edges

S. A. Wallis, M. A. Georgeson
2012 Journal of Vision  
Our experiments assessed the appearance of Mach bands (position and width) and the probability of seeing them on a novel set of generalized Gaussian edges.  ...  This ratio is approximately scale-invariant and increases with the sharpness of the corners of the luminance ramp, as observed.  ...  Methods Stimulus design Luminance profiles L(x) of the vertical 1-D images could vary from a Mach ramp through to a Gaussian edge and beyond under the control of a single shape parameter n.  ... 
doi:10.1167/12.13.18 pmid:23262150 fatcat:wzxxhy7dufhdfc54fjwnf7dxga

Resolution Acuity is better than Vernier Acuity

1997 Vision Research  
Now supposethe blurred edge is a linear ramp of widths. The quantity E'(x) is then a rectangle of width s. The standard deviation given by Eq.  ...  The multiples, edge through quadruple are identifiedby their order (m), -1 through +2, respectively (Klein 1989) .  ... 
doi:10.1016/s0042-6989(97)85878-6 pmid:9156197 fatcat:s2t5kx7i2fbofa2xn6wdfcx72y

One-dimensional modelling of limit-cycle oscillation and H-mode power scaling

Xingquan Wu, Guosheng Xu, Baonian Wan, Jens Juul Rasmussen, Volker Naulin, Anders Henry Nielsen
2015 Nuclear Fusion  
By slightly ramping up the heating power, the spatio-temporal evolution of turbulence intensity, density and pressure profiles, poloidal flow and E × B flow selfconsistently displays the L-H transition  ...  The model investigates the radial force balance equation at the edge region of the plasma and applies the quenching effect of turbulence via the E × B flow shear rate exceeding the shear suppression threshold  ...  Specifically considering the ion-loss cone located very near the edge, the ion loss flux has a deposition width λ b ∝ qε −0.5 ρ i proportional to the width of the banana orbit of trapped particles given  ... 
doi:10.1088/0029-5515/55/5/053029 fatcat:r3y52rwabrgx7ih4do7l36ochi
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