Results 221 to 230 of about 5,583,294 (267)

Contrast and Depth Perception: Effects of Texture Contrast and Area Contrast

Perception, 2007
Many objects in natural scenes have textures on their surfaces. Contrast of the texture surfaces (the texture contrast) reduces when the viewing distance increases. Similarly, contrast between the surfaces of the objects and the background (the area contrast) reduces when the viewing distance increases.
Shigeru, Ichihara, Norimichi, Kitagawa, Hiromi, Akutsu   +2 more
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Contrast adaptation and contrast gain control

Experimental Brain Research, 1991
Electrophysiological measurements have shown that contrast adaptation can increase the contrast gain of cortical cells of the cat and the monkey. This implies that adaptation could enhance the contrast discrimination sensitivity. Psychophysical contrast discrimination experiments were performed with and without contrast adaptation.
L M, Määttänen, J J, Koenderink
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The Contrast Contrast Illusion

2017
Abstract To most observers, a patch of medium-contrast texture viewed against a background of high-contrast texture appears lower in contrast than an identical patch viewed against a homogeneous, mean gray background. This is the contrast contrast illusion.
Charles Chubb, Joshua A. Solomon, George Sperling   +2 more
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Advances in Contrast Media and Contrast Injectors

Cardiology Clinics, 2009
This article reviews the currently available contrast media used for imaging during coronary angiography and percutaneous intervention. Recent data regarding potential adverse effects of contrast media and strategies to minimize adverse events are discussed.
John C, Messenger, Ivan P, Casserly
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Contrastive Logic

Logic Journal of IGPL, 1995
Summary: I introduce the notion of bilogics, namely logics interpreted over a pair of structures, in contrast to classical logic and many of its variations, the formulae of which are interpreted over one structure. In particular, I introduce and study Contrastive Logic, suitable for expressing contrast and conformity between the two structures involved.
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Toboggan contrast enhancement for contrast segmentation

[1990] Proceedings. 10th International Conference on Pattern Recognition, 2002
Toboggan contrast enhancement is a noniterative single-parameter linear execution time method for selectively augmenting the contrast of multispectral images of arbitrary dimensionality. Toboggan enhancement followed by contrast segmentation is compared with adaptive smoothing, all iterative, multiple parameter, parallel approach that achieves similar ...
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Pupil constriction by contrast for contrast

Neuron
The pupil is the eye's adjustable aperture. Fitzpatrick et al. find that visual contrast constricts the pupil, increasing contrast.1 This process improves behavioral performance. Its retinal origin has unorthodox elements, like interneurons that make connections in unusual locales and photoreceptive ganglion cells.
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Brightness Contrast, Color Contrast, and Legibility

Human Factors: The Journal of the Human Factors and Ergonomics Society, 1965
An experimental study was conducted investigating the effects of color and brightness contrast, direction of contrast, and six contrast values upon the legibility of a circular dial. The brightness of four chromatic hues was matched with four achromatic hues. Hues were combined in all possible combinations excluding chromatic with achromatic, resulting
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Resurgence and Behavioral Contrast, Compared and Contrasted

Perspectives on Behavior Science
This is a review of the relation between operant response resurgence and behavioral contrast. Both are defined by rate changes in a target response as a function of environmental changes spatially or temporally distal to the location of the target response.
Kennon A, Lattal, Amanda K, Miles
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Contours and contrast

2008
Contrast in photographic and computer-generated imagery communicates colour and lightness differences that would be perceived when viewing the represented scene. Due to depiction constraints, the amount of displayable contrast is limited, reducing the image's ability to accurately represent the scene.
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