Results 231 to 240 of about 530,690 (264)

Spatial Frequency Channels

1984
Spatial frequency channels are systems sensitive to a limited range of spatial frequencies. In the human visual system these are considered to be a population of cells with similar tuning characteristics specifically sensitive to a restricted range of the contrast sensitivity function envelope. See bandpass filter .
Alan Bundy, Lincoln Wallen
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Spatial/spatial-frequency representations for image segmentation and grouping

Image and Vision Computing, 1991
Abstract In this paper, we consider the application of spatial/ spatial-frequency representations to texture-based image segmentation and to perceptual grouping, a related phenomenon. We discuss a system for segmentation and grouping, based on the pseudo-Wigner distribution (PWD) a discrete approximation to the WD, and show experimental results.
Todd R. Reed, Harry Wechsler
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Interactions between spatial frequency channels

Vision Research, 1978
Abstract The sensitivities for sinusoidal gratings of various spatial frequencies were determined by a two-alternative forced-choice technique. The effects of the simultaneous presence of a grating of 4.25 c/deg on sensitivity were examined. The effects of prolonged adaptation to the same grating were also examined.
D J, Tolhurst, L P, Barfield
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Contrast and Spatial Frequency

Scientific American, 1974
F W, Campbell, L, Maffei
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Spatial Frequency and Lightness

Color and Imaging Conference, 2004
Nathan Moroney, Sabine Süsstrunk
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Spatial frequency mapping

covariation between cortical magnification and preferred spatial frequency in human V1 measured using ...
Himmelberg, Marc, Kwak, Yuna, Winawer, Jonathan, Carrasco, Marisa   +3 more
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Spatial Frequency Filters

2012
A certain number of scanned lines ( line images ) in a real-life image may display sinusoidal intensity profiles, but not all line images along the x or y axis are likely to contain sinusoidal or periodic intensity variations. Despite the nonperiodic nature of line images, and hence the whole image frame, the frequency spectrum of an image or an ...
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The Spatial and Frequency Domains

2009
The interconversion between spatial and frequency domains using Fourier and other transforms is of critical importance in image processing and, for some imaging methods, the construction of images from raw scan data. A significant feature of the transforms is that we can convert back and forth between spatial and frequency domains without loss of ...
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Spatial Frequencies

2013
Renée Heilbronner, Steve Barrett
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Spatial-frequency convolutional self-attention network for EEG emotion recognition

Applied Soft Computing Journal, 2022
Dongdong Li, Hai Yang
exaly