Results 211 to 220 of about 1,210,014 (249)

Vision channels, contrast sensitivity, and functional vision

SPIE Proceedings, 2004
The neurophysiology and psychophysics of vision provide the basis for vision channels. Vision channels are the foundation of understanding spatial vision. This understanding has led to the development of a general model of visual perception and tests of functional vision.
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Models of contrast sensitivity in human vision

IEEE Transactions on Systems, Man, and Cybernetics, 1993
Eight models are examined as input-output representations of steady-state vision in humans at moderate to low level illumination. Three new models for visual contrast sensitivity are introduced and evaluated using contrast sensitivity function (CSF) data with samples on both narrow and wide frequency ranges.
G.C. Gilmore, F.L. Royer, C.W. Thomas
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A silicon retina for polarization contrast vision

IJCNN'99. International Joint Conference on Neural Networks. Proceedings (Cat. No.99CH36339), 2003
Polarization vision is prevalent among insects, and offers visual capabilities that contribute to object discrimination and homing tasks. We present a CMOS imager that is capable of extracting polarization contrast in a scene. A similar visual modality has been seen in Octopus.
Z.K. Kalayjian, Andreas G. Andreou
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Spatial Vision and Aging. I: Contrast Sensitivity

Journal of Gerontology, 1980
Contrast sensitivity functions (CSFs) were measured for two groups of healthy observers, a younger group with mean age 18.5 years and an older group with mean age 73 years. Although the two groups had virtually identical sensitivities to high spatial frequencies (gratings with narrow bars), the younger observers were three times more sensitive at low ...
Robert Sekuler, Lucinda Picciano Hutman
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The embodied mind: Contrasting visions

Mind, Culture, and Activity, 1999
This article presents a critical examination and discussion of 2 arguments in support of the embodied mind position as developed within the philosophical literature of the Cognitive Linguistics paradigm. Employing the dialectical Materialist approach of Evald Ilyenkov (1997), closely allied to the cultural‐historical and activity theory traditions, the
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Temporal properties of spatial contrast vision

Vision Research, 1987
The temporal characteristics of spatial contrast vision at and above threshold were assessed psychophysically using sinusoidal gratings and a contrast-matching method. Temporal frequency response curves became flatter as contrast level increased. An impulse response model was fitted to these flicker data, and used to make predictions about temporal ...
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Contrasting Visions and Continuing Struggle

2020
This chapter addresses the European Community’s involvement in the creation of the European Science Foundation (ESF), an independent and nongovernmental European institution devoted to fundamental research, and another disappointment for the promoters of an EC-centric vision for European research collaboration.
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Vision assistance in scenes with extreme contrast

IEEE Micro, 1993
The performance and architecture of a high dynamic range camera (HDRC) chip and the conceptional advantages for its adaptation to image processing systems in traffic environments are discussed. The HDRC chip was developed with 64*64 pixels using a standard digital 1.2- mu m CMOS technology.
U. Seger, M.E. Landgraf, H.-G. Graf
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Measurements of contrast sensitivity for peripheral vision

ACM Symposium on Applied Perception 2019, 2019
Contrast detection thresholds were measured for the eccentricities from 0° to 27° and a range of stimuli frequencies from 0.125cpd to 16cpd. The measurements were motivated by the need to collect visual performance data for the gaze-contingent rendering system.
Radosław Mantiuk, Michał Chwesiuk
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Vision Evaluation Using Contrast Sensitivity Functions

Optometry and Vision Science, 1983
The use of Contrast Sensitivity Functions (CSF's) in vision evaluation has been explored for several years. Although theoretically superior to Snellen acuity and similar measures, the use of CSF is not widespread. A review of some of the clinical conditions in which CSF's have been used is followed by a discussion of the problems involved in their ...
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