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Contrast (vision)

About: Contrast (vision) is a research topic. Over the lifetime, 10379 publications have been published within this topic receiving 221480 citations.


Papers
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Journal ArticleDOI
TL;DR: In this paper, an efficient color space for contrast enhancement of myocardial perfusion images was established, where contrast limited adaptive histogram equalization was applied to the chrominance channels of the cardiac nuclear image, leaving the luminance channel unaffected.

64 citations

Journal ArticleDOI
01 Sep 2005-Neuron
TL;DR: Using functional magnetic imaging, it is shown that two associative areas of the dorsal pathway--in the caudal region of the intrapariatal sulcus and in the lateral occipital sulcus--respond specifically to the Craik-O'Brien-Cornsweet illusion generated by high-pass filtered edges.

64 citations

Journal ArticleDOI
TL;DR: The authors found that rats are more likely to miss the target when flankers are collinear and the same impairment was found even when the flanker luminance was sign-reversed relative to the target.
Abstract: We measure rats' ability to detect an oriented visual target grating located between two flanking stimuli ("flankers"). Flankers varied in contrast, orientation, angular position, and sign. Rats are impaired at detecting visual targets with collinear flankers, compared to configurations where flankers differ from the target in orientation or angular position. In particular, rats are more likely to miss the target when flankers are collinear. The same impairment is found even when the flanker luminance was sign-reversed relative to the target. These findings suggest that contour alignment alters visual processing in rats, despite their lack of orientation columns in the visual cortex. This is the first report that the arrangement of visual features relative to each other affects visual behavior in rats. To provide a conceptual framework for our findings, we relate our stimuli to a contrast normalization model of early visual processing. We suggest a pattern-sensitive generalization of the model that could account for a collinear deficit. These experiments were performed using a novel method for automated high-throughput training and testing of visual behavior in rodents.

64 citations

Journal ArticleDOI
TL;DR: It is concluded that, even if problems with the accuracy of the suggested techniques of aberration correction, through corneal excimer laser ablation or customised contact lenses, can be overcome, changes in monochromatic ocular aberration over time are likely to result in only minor improvements in the high‐contrast acuity performance of most normal eyes being produced by attempted aberration control.

64 citations

Journal ArticleDOI
TL;DR: This work shows that the brightness of an object in a natural scene depends on the amount of light reflected from the object in comparison to light from other parts of the scene, and that this phenomenon is mediated by two separate neural mechanisms at distinct levels of the visual system.

64 citations


Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20241
20231,864
20223,760
2021413
2020329
2019354