Results 281 to 290 of about 295,698 (318)
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Motion detection with an unstable camera
2008 15th IEEE International Conference on Image Processing, 2008Fast and accurate motion detection in the presence of camera jitter is known to be a difficult problem. Existing statistical methods often produce abundant false positives since jitter-induced motion is difficult to differentiate from scene-induced motion. Although frame alignment by means of camera motion compensation can help resolve such ambiguities,
Pierre-Marc Jodoin +3 more
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Detection of relative and uniform motion
Journal of the Optical Society of America A, 2002We measured the lowest velocity (velocity threshold) for discriminating motion direction in relative and uniform motion stimuli, varying the contrast and the spatial frequency of the stimulus gratings. The results showed significant differences in the effects of contrast and spatial frequency on the threshold, as well as on the absolute threshold level
Satoshi, Shioiri +3 more
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Motion detection with spatiotemporal sequences
2014 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP), 2014In this paper we propose a new method to detect motion in a greyscale video. In our algorithm, several spatiotemporal sequences with different lengths are used to filter the frames in the video. Then these filtered images are combined together to get the real motion. The performance of our algorithm is tested with several human action datasets in which
Tong Zhang, Haixian Wang
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Influence of motion on chromatic detection
Visual Neuroscience, 2004Intense scrutiny has been focused on whether chromatic stimuli contribute to motion perception. The present study considers a related but different question: how does motion affect chromatic detection? Detection thresholds were measured for a disk that underwent a brief (13.3 ms) chromatic change in the L/(L+M) chromatic direction.
Patrick, Monnier, Steven K, Shevell
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Conditions for the detection of coherent motion
Vision Research, 1991Previous studies have suggested that human motion perception involves at least two different detection stages: an orientation selective or component motion stage and a combination stage where selectivity to the coherent motion of a pattern, e.g. a plaid is established. These studies are inconclusive as to the motion detection process per se.
A V, van den Berg, W A, van de Grind
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Visual Motion Detection in the Cat
Science, 1964Responses of some cells in the cat cortex to moving stimulation depend on direction of motion. These cells give neither "on" nor "off" responses to uniform illumination. Response can be elicited over a wide region of the retina in either eye, and the discharge pattern does not follow the temporal variations in luminance on the retina which accompany ...
G, BAUMGARTNER, J L, BROWN, A, SCHULZ
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Pedestrain detection from motion
2016 23rd International Conference on Pattern Recognition (ICPR), 2016Pedestrian detection is a challenging problem studied over decades. Most algorithms are based on human appearance. Only few works consider motion as a feature component. In this paper, however, we tackle this problem only considering short periods of pedestrian walking.
Mehmet Kilicarslan +2 more
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Motion detection in temporal clutter
1997A motion detection technique is presented which exhibits robust properties suitable for general operation in a surveillance environment. The technique is sensitive to transient perturbations present in an image sequence while being insensitive to temporal clutter. Its performance is robust to scale and offset variations in the input sequence.
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Picosecond detection of electron motion
Nature Nanotechnology, 2019The motion of a single electron can now be sampled with picosecond resolution, which helps to characterize and understand non-equilibrium electron dynamics in nanoscale conductors.
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