Journal ArticleDOI
Grating summation in fovea and periphery
TLDR
The detectability of compound gratings containing two sinusoidal components was compared to that of each component alone and the results are consistent with models postulating several sizes of receptive fields at each position in the visual field but not with model postulating only one size at each positions.About:
This article is published in Vision Research.The article was published on 1978-01-01. It has received 233 citations till now. The article focuses on the topics: Visual field & Contrast (vision).read more
Citations
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Proceedings ArticleDOI
DCT quantization matrices visually optimized for individual images
TL;DR: Here I show how to compute a matrix that is optimized for a particular image, and custom matrices for a number of images show clear improvement over image-independent matrices.
Journal ArticleDOI
Uncertainty explains many aspects of visual contrast detection and discrimination.
TL;DR: In this article, the uncertainty model of visual contrast detection was proposed, which assumes that the observer is uncertain among many signals and chooses the likeliest with only four parameters, and explains why d' is approximately a power function of contrast and accurately predicts effects of summation, facilitation, noise, subjective criterion and task for near-threshold contrast.
Journal ArticleDOI
Probability summation and regional variation in contrast sensitivity across the visual field.
John G. Robson,Norma Graham +1 more
TL;DR: Compared sensitivity at different positions in the visual field has been measured at various spatial frequencies using a patch of grating suitably vignetted to give a stimulus localized in both space and spatial frequency to explain the relation between sensitivity and number of cycles.
Journal ArticleDOI
The psychophysics of visual search.
TL;DR: It is concluded that low threshold theories can account for simple visual search without invoking mechanisms such as limited capacity or serial processing.
Journal ArticleDOI
Discrimination at threshold: labelled detectors in human vision.
Andrew B. Watson,John G. Robson +1 more
TL;DR: It is found that the detectors of these stimuli arelabelled, in the sense that the observer can distinguish the response of each detector from that of any other, and that the detector form two non-overlapping sets in their selectivity for temporal frequency.
References
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Book
Signal detection theory and psychophysics
David M. Green,John A. Swets +1 more
TL;DR: This book discusses statistical decision theory and sensory processes in signal detection theory and psychophysics and describes how these processes affect decision-making.
Journal ArticleDOI
Application of fourier analysis to the visibility of gratings
F. W. Campbell,John G. Robson +1 more
TL;DR: The contrast thresholds of a variety of grating patterns have been measured over a wide range of spatial frequencies and the results show clear patterns of uniformity in the response to grating noise.
Journal ArticleDOI
Optical and retinal factors affecting visual resolution.
F. W. Campbell,D G Green +1 more
TL;DR: An improved version of the well-known interference fringe technique which theoretically allows a sinusoidal pattern of very high contrast to be formed directly on the retina to be obtained without prior modification by the optics of the eye is reported.
Journal ArticleDOI
A vector-magnitude model of contrast detection.
TL;DR: In this paper, a non-Euclidean magnitude of the vector composed of the responses of a large number of independent channels is used to determine the visibility of a low-contrast stimulus.
Journal ArticleDOI
Spatial-Frequency Channels in Human Vision*
TL;DR: Psychometric functions were determined concurrently for detection of simple gratings and complex gratings, compatible with the assumption that the human visual system contains sensory channels, each selectively sensitive to different narrow ranges of spatial frequencies, whose outputs are detected independently.