The Analogy between Stereo Depth and Brightness

Perception ◽  
1989 ◽  
Vol 18 (5) ◽  
pp. 601-614 ◽  
Author(s):  
Allen Brookes ◽  
Kent A Stevens
Keyword(s):  
Lateral Inhibition ◽  
Spatial Differentiation ◽  
Higher Order ◽  
Apparent Depth ◽  
Simultaneous Contrast ◽  
Original Signal ◽  
Contrast Effects ◽  
Spatial Derivatives

Apparent depth in stereograms exhibits various simultaneous-contrast and induction effects analogous to those reported in the luminance domain. This behavior suggests that stereo depth, like brightness, is reconstructed, ie recovered from higher-order spatial derivatives or differences of the original signal. The extent to which depth is analogous to brightness is examined. There are similarities in terms of contrast effects but dissimilarities in terms of the lateral inhibition effects traditionally attributed to underlying spatial-differentiation operators.

scholarly journals Impedance Cardiography Signal Enhancement through Block Based Adaptive Cancellers for Distant Medical Care

2020 ◽  
Vol 9 (3) ◽  
pp. 3161-3167
Keyword(s):  
Convergence Rate ◽  
Medical Care ◽  
Impedance Cardiography ◽  
Adaptive Methods ◽  
Higher Order ◽  
Data Normalization ◽  
Original Signal ◽  
Block Based ◽  
Working Method ◽  
The Ideal

The impedance Cardiography (ICG) assists the impedance occurred in the heart. The ICG also known as Thoracic Electro Bio-Impedance (TEB).This projects various flexible and mathematical reduced adaptive methods to visualize the extreme clear TEB modules. In the medical premises, TEB wave notifies the several physiological and non-physiological incidents, that covers small characteristics which are predominant for finding the volume of the stroke. In addition, mathematical difficulty is a significant constraint to novel healthcare observing tool. Therefore, the paper project novel wave working methods for TEB improvement in isolated arrangements. So that we selected higher preference adaptive eliminator as a fundamental constituent in the procedure. To recover the original signal, convergence rate, to minimize mathematical difficulty of the wave working method, we relate the data normalization to extract the ideal wave. The projected realizations are simulated with practical TEB waves. At last, outcomes proves projected extracted normalized higher order filter is appropriate to realistic medical arrangement.

scholarly journals Gloss averaging and simultaneous contrast effects on real bicolored glossy surfaces

2015 ◽  
Vol 15 (12) ◽  
pp. 939
Author(s):  
Sabrina Hansmann-Roth ◽  
Pascal Mamassian ◽  
Sylvia Pont
Keyword(s):  
Simultaneous Contrast ◽  
Contrast Effects

The Reversed Contrast Necker Cube

2017 ◽  
Author(s):  
Alessandra Galmonte ◽  
Tiziano Agostini
Keyword(s):  
Lateral Inhibition ◽  
Necker Cube ◽  
Simultaneous Contrast ◽  
Theoretical Assumption ◽  
Global Organization ◽  
Lightness Induction

Agostini and Galmonte reported a configuration showing that when grouping factors are optimized, a grey target totally surrounded by black appears darker than an equal grey target totally surrounded by white. This is called the simultaneous contrast. The theoretical assumption is that, when higher-level factors act simultaneously with lower-level factors, the former prevails over the latter. Specifically, it is assumed that the lightness induction produced by the global organization principle of perceptual belongingness prevails over retinal lateral inhibition. A reversed contrast Necker cube display with two middle grey dashed cubes is used to illustrate the effect. The first one had dark inducer corners and was placed on a light inducer background, and the second one, which had light inducer corners, was placed on a dark inducer background.lightness induction, grouping, perceptual belongingness, lateral inhibition, organization principles

Localization of damage with speckle shearography and higher order spatial derivatives

2014 ◽  
Vol 49 (1-2) ◽  
pp. 24-38 ◽  
Author(s):  
H. Lopes ◽  
F. Ferreira ◽  
J.V. Araújo dos Santos ◽  
P. Moreno-García
Keyword(s):  
Higher Order ◽  
Spatial Derivatives

scholarly journals Alcohol reduces simultaneous contrast effects in human vision

2010 ◽  
Vol 2 (7) ◽  
pp. 208-208 ◽  
Author(s):  
K. Johnston ◽  
B. Timney ◽  
D. Leung ◽  
S. Khan
Keyword(s):  
Human Vision ◽  
Simultaneous Contrast ◽  
Contrast Effects

scholarly journals MODEL OF THE STRUCTURED CONTINUUM, AND THE RELATION BETWEEN SPECIFIC SURFACE AREA, POROSITY AND PERMEABILITY

2013 ◽  
Vol 31 (4) ◽  
pp. 559 ◽  
Author(s):  
Boris Sibiryakov ◽  
Lourenildo W.B. Leite ◽  
Wildney W.S. Vieira
Keyword(s):  
Porous Media ◽  
Degrees Of Freedom ◽  
Infinite Order ◽  
Energy Content ◽  
Equation Of Motion ◽  
Higher Order ◽  
Structured Media ◽  
Porosity And Permeability ◽  
Spatial Derivatives ◽  
The Continuum

ABSTRACT. Contrary to the Cauchy and Poisson classical seismic theory of the continuum, the new theory for structured (also called porous, fractured, or blocked) media must contain several degrees of freedom. This fact is evident because elementary blocks (grains) may transfer the motion by contact interaction, by rotation, and by group of particles. Therefore, the energy content is not only contained within the first spatial derivatives (strains), but the potential energy content is within the second (curvatures) and other higher order spatial derivatives. Thus, the equation of motion of porous media should contain higher order spatial derivatives, andmay even contain infinite order spatial derivatives.Keywords: seismic structured media, porous media, fractured media. RESUMO. Contrariamente aos problemas clássicos da teoria sísmica do contínuo de Cauchy e Poisson, a nova teoria para meios estruturados (também denominados de porosos, fraturados e blocados) deve conter vários graus de liberdade. Este fato é evidente porque blocos elementares (grãos) podem transferir movimento por interação de contato, por rotação, e por grupo de partículas. Desta forma, o conteúdo de energia não está apenas contido nas primeiras derivadas espaciais (deformações), como também o conteúdo de energia potencial está presente na segunda (curvaturas), e em derivadas espaciais de maior ordem. Sendo assim, a equação de movimento para meios porosos deveria conter derivadas espaciais de ordem mais altas, e até mesmo uma ordem infinita de derivadas espaciais.Palavras-chave: meios sísmicos estruturados, meios porosos, meios fraturados.

Electrochemical digital simulations with an exponentially expanding grid: General expressions for higher order approximations to spatial derivatives

2009 ◽  
Vol 54 (3) ◽  
pp. 1042-1055 ◽  
Author(s):  
Francisco Martínez-Ortiz ◽  
Noemí Zoroa ◽  
Ángela Molina ◽  
Carmen Serna ◽  
Eduardo Laborda
Keyword(s):  
Higher Order ◽  
Spatial Derivatives ◽  
Digital Simulations
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