Search Results - "van Doorn, A. J."

The “shading twist,” a dynamical shape cue by Koenderink, J. J., van Doorn, A. J., Pont, S. C.

“…When a light source moves, the isophotes of the illuminance field (observed as “shading” in the case of Lambertian surfaces) move over the surfaces of…”
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Spatio-temporal tuning of motion coherence detection at different luminance levels by Lankheet, M.J.M, van Doorn, A.J, van de Grind, W.A

“…We studied effects of dark adaptation on spatial and temporal tuning for motion coherence detection. We compared tuning for step size and delay for moving…”
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Motion coherence detection as a function of luminance level in human central vision by Lankheet, M.J.M, van Doorn, A.J, Bouman, M.A, van de Grind, W.A

“…We studied the changes and invariances of foveal motion detection upon dark adaptation. It is well-documented that dark adaptation affects both spatial and…”
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Which Fragments of a Sign Enable Its Recognition? by HOLT, G. A. TEN, VAN DOORN, A. J., DE RIDDER, H., REINDERS, M. J. T., HENDRIKS, E. A.

“…In sign language studies, it is generally assumed that a sign can be divided into several phases in time (preparation, stroke, and retraction) and that the…”
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Inhomogeneity and anisotropies for motion detection in the monocular visual field of human observers by van de Grind, W A, Koenderink, J J, van Doorn, A J, Milders, M V, Voerman, H

“…Signal-to-noise-ratio (SNR) thresholds were measured for the detection of coherent motion in moving random pixel arrays of constant root-mean-square contrast…”
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Signs in Which Handshape and Hand Orientation Are Either Not Visible or Are Only Partially Visible: What Is the Consequence for Lexical Recognition? by HOLT, G. A. TEN, VAN DOORN, A. J., DE RIDDER, H., REINDERS, M. J. T., HENDRIKS, E. A.

“…We present the results of an experiment on lexical recognition of human sign language signs in which the available perceptual information about handshape and…”
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Representation of local geometry in the visual system by Koenderink, J J, van Doorn, A J

“…It is shown that a convolution with certain reasonable receptive field (RF) profiles yields the exact partial derivatives of the retinal illuminance blurred to…”
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Motion detection from photopic to low scotopic luminance levels by van de Grind, Wim A, Koenderink, Jan J, van Doorn, Andrea J

“…In this study we quantify the influence of adaptation luminance on the threshold for direction-detection in coherently moving random-pixel arrays (RPAs)…”
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Affine structure from motion by Koenderink, J J, van Doorn, A J

“…A mobile observer samples sequences of narrow-field projections of configurations in ambient space. The so-called structure-from-motion problem is to infer the…”
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Ambiguity and the ‘Mental Eye’ in Pictorial Relief by Koenderink, Jan J, van Doorn, Andrea J, Kappers, Astrid M L, Todd, James T

“…Photographs of scenes do not determine scenes in the sense that infinitely many different scenes could have given rise to any given photograph. In…”
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Viewing-distance invariance of movement detection by VAN DE GRIND, W. A, KOENDERINK, J. J, VAN DOORN, A. J

“…Since visual movement information is often presented in electronic displays or films it is amazing that there is a paucity of research on the influence of…”
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The distribution of human motion detector properties in the monocular visual field by van de Grind, W A, Koenderink, J J, van Doorn, A J

“…The detection of coherent movement in stroboscopically (100 Hz) displayed moving random checkerboard ("Julesz-") patterns is studied psychophysically for…”
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Depth and shape from differential perspective in the presence of bending deformations by Koenderink, J J, van Doorn, A J

“…It is shown that there exist classes of useful partial solutions to what has become known as the structure from motion problem, that is, the problem of finding…”
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Direct Measurement of the Curvature of Visual Space by Koenderink, Jan J, van Doorn, Andrea J, Lappin, Joseph S

“…We consider the horizontal plane at eye height, that is all objects seen at the horizon. Although this plane visually degenerates into a line in the visual…”
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Spectral sensitivity and wavelength discrimination of the human peripheral visual field by van Esch, J A, Koldenhof, E E, van Doorn, A J, Koenderink, J J

“…Spectral sensitivity and wavelength discrimination are determined along the nasal horizontal meridian of the human peripheral retina. The target size as a…”
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Detection of coherent movement in peripherally viewed random-dot patterns by van de Grind, W A, van Doorn, A J, Koenderink, J J

“…We studied the detection of coherent motion in stroboscopically moving random-dot patterns for foveal vision and at eccentricities of 6, 12, 24, and 48 deg in…”
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Receptive field families by KOENDERINK, J. J, VAN DOORN, A. J

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On so-called paradoxical monocular stereoscopy by Koenderink, J J, van Doorn, A J, Kappers, A M

“…Human observers are apparently well able to judge properties of 'three-dimensional objects' on the basis of flat pictures such as photographs of physical…”
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Effects of changing viewing conditions on the perceived structure of smoothly curved surfaces by Todd, J T, Koenderink, J J, van Doorn, A J, Kappers, A M

“…Observers' perceptions of a male and a female torso were investigated using monocular and stereoscopic images under varying conditions of illumination…”
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Depth relief by Koenderink, J J, van Doorn, A J, Kappers, A M

“…A study is reported of the depth relief in a simple three-dimensional scene consisting of a white, rough sphere on a planar support, illuminated in a natural…”
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