Results 271 to 280 of about 295,698 (318)

Polarization contrast and motion detection

Journal of Comparative Physiology A, 2006
Form and motion perception rely upon the visual system's capacity to segment the visual scene based upon local differences in luminance or wavelength. It is not clear if polarization contrast is a sufficient basis for motion detection. Here we show that crayfish optomotor responses elicited by the motion of images derived from spatiotemporal variations
Raymon M, Glantz, John P, Schroeter
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The optimal displacement for the detection of motion

Vision Research, 1990
The optimal spatial displacement for the detection of motion by the human visual system was investigated using spatially narrow band stimuli. Direction discrimination was used for abruptly displaced stimuli. An optimal spatial displacement was found for the detection of motion and this bore a characteristic relationship to the spatial wavelength of the
J C, Boulton, R F, Hess
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An overview of motion detection

Proceedings of the International Conference and Workshop on Emerging Trends in Technology, 2010
This paper is a review of the block matching algorithms used for motion estimation and motion compensation in video compression. There are different types of block matching algorithms that range from the very basic Exhaustive Search to the recent fast adaptive algorithms like Adaptive Rood Pattern Search.
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Motion anisotropies and heading detection

Biological Cybernetics, 1995
In motion-processing areas of the visual cortex in cats and monkeys, an anisotropic distribution of direction selectivities displays a preference for movements away from the fovea. This 'centrifugal bias' has been hypothetically linked to the processing of optic flow fields generated during forward locomotion.
Markus Lappe, Josef P. Rauschecker
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Mechanisms of visual motion detection

Nature Neuroscience, 2000
Visual motion is processed by neurons in primary visual cortex that are sensitive to spatial orientation and speed. Many models of local velocity computation are based on a second stage that pools the outputs of first-stage neurons selective for different orientations, but the nature of this pooling remains controversial.
P R, Schrater, D C, Knill, E P, Simoncelli   +2 more
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Automatic motion detection for surveillance

Artificial Life and Robotics, 2007
Automatic motion detection features are able to enhance surveillance efficiency and quality. The aim of this research is to recognize and detect motion automatically around a robot's environment in order to equip a mobile robot for a surveillance task.
Norrima Mokhtar, Masanori Sugisaka, Omar Rosli   +2 more
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Motion blur detection in radiographs

SPIE Proceedings, 2008
Image blur introduced by patient motion is one of the most frequently cited reasons for image rejection in radiographic diagnostic imaging. The goal of the present work is to provide an automated method for the detection of anatomical motion blur in digital radiographic images to help improve image quality and facilitate workflow in the radiology ...
Hui Luo, William J. Sehnert, Jacquelyn S. Ellinwood, David H. Foos, Bruce I. Reiner, Eliot L. Siegel   +5 more
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Motion coding for pattern detection

Proceedings of the 3rd symposium on Applied perception in graphics and visualization, 2006
A relatively underutilized method for visualizing data is to map variables directly to the oscillatory motion of glyphs. When doing this, the most straightforward parameters to consider are the frequency, phase and amplitude of sinusoidal oscillation. We report the results of an experiment that used a staircase procedure to assess human sensitivity to ...
Ware, Colin, Babrow, Rusty
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Luminance contrast and motion detection

Vision Research, 1990
Direction discrimination was used to measure the minimum and maximum displacement for the detection of motion (Dmin and Dmax) for abruptly displaced sinewave gratings. This was measured for a range of contrast levels from 2 to 32 times the detection threshold for a range of spatially narrow band stimuli. Performance for Dmin (but not Dmax) was found to
J C, Boulton, R F, Hess
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Collision detection in motion simulation

Computers & Graphics, 1983
Abstract This paper describes a method of detecting collisions in motion simulation. In motion simulation, objects occasionally share a sphere in the simulated world. This would not occur in the real world, since objects would have collided before they shared a common sphere.
Tetsuya Uchiki, Toshiaki Ohashi, Mario Tokoro   +2 more
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