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contrast sensitivity in

by A Luksch, G Rainer, D Koyuncu, P Ehrlich, T Maca, M E Gschw, C Vass, L Schmetterer
"... SCIENTIFIC REPORT Effect of nimodipine on ocular blood flow and colour ..."
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SCIENTIFIC REPORT Effect of nimodipine on ocular blood flow and colour

Contrast sensitivity in children and adults

by L. D. Beazley, D. J. Illingworth, A. Jahn, D. V. Greer - British Medical Journal. 1980
"... SUMMARY Contrast sensitivity functions to vertical sinusoidal gratings have been measured in 135 subjects ranging from 3 to 29 years of age. The reported contrast sensitivities for all spatial frequen-cies increased steadily with age, reaching adult levels during adolescence. The usefulness of these ..."
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SUMMARY Contrast sensitivity functions to vertical sinusoidal gratings have been measured in 135 subjects ranging from 3 to 29 years of age. The reported contrast sensitivities for all spatial frequen-cies increased steadily with age, reaching adult levels during adolescence. The usefulness

Contrast sensitivity at high velocities

by David C. Burr, John Ross - Vision Research , 1982
"... A~~ct-Measurements were made of the contrast required to see the direction of motion of drifting gratings (Part 1) and of moving bars (Part 2). The spatial frequency at which least contrast is required to see sinusoidal gratings decreases as their velocity increases, but peak sensitivity is identica ..."
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A~~ct-Measurements were made of the contrast required to see the direction of motion of drifting gratings (Part 1) and of moving bars (Part 2). The spatial frequency at which least contrast is required to see sinusoidal gratings decreases as their velocity increases, but peak sensitivity

On contrast sensitivity in an image difference model

by Garrett M. Johnson, Mark D. Fairchild - Proc. of IS&T PICS Conference , 2001
"... The importance of the human contrast sensitivity function (CSF) in a color image difference metric is examined. The contrast sensitivity function is used to extend traditional color difference equations for use with complex image stimulus. Three CSF models of various complexities are evaluated using ..."
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The importance of the human contrast sensitivity function (CSF) in a color image difference metric is examined. The contrast sensitivity function is used to extend traditional color difference equations for use with complex image stimulus. Three CSF models of various complexities are evaluated

Exercise does not increase contrast sensitivity

by Mcoptom Faa, Mcoptom Faa , 1997
"... The contrast sensitivity of 19 healthy normal subjects was measured before and imme-diately after 10 minutes of controlled exercise on an exercise bicycle. Contrast sensitiv-ity was measured with an adaptive procedure, which is relatively free of decision crite-ria effects and the rate of false posi ..."
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The contrast sensitivity of 19 healthy normal subjects was measured before and imme-diately after 10 minutes of controlled exercise on an exercise bicycle. Contrast sensitiv-ity was measured with an adaptive procedure, which is relatively free of decision crite-ria effects and the rate of false

The effect of orientation learning on contrast sensitivity

by Nestor Matthews A, Zili Liu B, Ning Qian A , 2000
"... Society of America A, 2(2), 147–155] previously demonstrated that adapting to an oriented visual stimulus improves sensitivity to subtle orientation differences while impairing contrast sensitivity. Here, we investigated whether practice-based improvements in orientation sensitivity would, like adap ..."
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Society of America A, 2(2), 147–155] previously demonstrated that adapting to an oriented visual stimulus improves sensitivity to subtle orientation differences while impairing contrast sensitivity. Here, we investigated whether practice-based improvements in orientation sensitivity would, like

CONTRAST SENSITIVITY OF THE CHANGING-SIZE CHANNEL

by J. T. Petersik, K. I. Beverley, D. Regan , 1981
"... Two experiments investigated the contrast sensitivity of the visual changing-size channel, and in particular whether the perception of sideways motions and changing-size are mediated by different contrast-sensitive stages. In Experiment 1, subjects adjusted the contrast required to (1) detect, or (2 ..."
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Two experiments investigated the contrast sensitivity of the visual changing-size channel, and in particular whether the perception of sideways motions and changing-size are mediated by different contrast-sensitive stages. In Experiment 1, subjects adjusted the contrast required to (1) detect

Contrast Sensitivity in Mammographic Softcopy Reading

by Göttingen Germany
"... In mammographic softcopy reading, assessment of contrast resolution is mainly performed with phantoms, including detection tasks with a homogeneous image background. For tasks in visual perception a processing hierarchy is assumed, where detection tasks represent the base level. The results of inves ..."
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of investigations based on detection tasks might not allow predictions on the sensitivity for recognizing low-contrast patterns in a situation with complex images. We introduce the MCS method (Mammographic Contrast Sensitivity) for determining the contrast sensitivity function (CSF) in mammograms. Gabor patterns

Impact of Adaptation Time on Contrast Sensitivity

by Dörte Apelt , Hans Strasburger , Jan Klein , Bernhard Preim
"... ABSTRACT For softcopy-reading of mammograms, a room illuminance of 10 lx is recommended in standard procedures. Room illuminance affects both the maximal monitor contrast and the global luminance adaptation of the visual system. A radiologist observer has to adapt to low luminance levels, when ente ..."
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entering the reading room. Since the observer's sensitivity to low-contrast patterns depends on adaptation state and processes, it would be expected that the contrast sensitivity is lower at the beginning of a reading session. We investigated the effect of an initial time of dark adaptation

How do attention and adaptation affect contrast sensitivity

by Franco Pestilli, Gerardo Viera, Marisa Carrasco - Journal of Vision , 2007
"... Attention and adaptation are both mechanisms that optimize visual performance. Attention optimizes performance by increasing contrast sensitivity for and neural response to attended stimuli while decreasing them for unattended stimuli; adaptation optimizes performance by increasing contrast sensitiv ..."
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Attention and adaptation are both mechanisms that optimize visual performance. Attention optimizes performance by increasing contrast sensitivity for and neural response to attended stimuli while decreasing them for unattended stimuli; adaptation optimizes performance by increasing contrast
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