QUE SIGNIFIE SPATIAL FREQUENCY EN ANGLAIS
Fréquence spatiale
En mathématiques, en physique et en ingénierie, la fréquence spatiale est une caractéristique de toute structure qui est périodique à travers la position dans l'espace. La fréquence spatiale est une mesure de la fréquence à laquelle les composants sinusoïdaux de la structure se répètent par unité de distance. L'unité SI de fréquence spatiale est des cycles par mètre. Dans les applications de traitement d'image, la fréquence spatiale est souvent exprimée en unités de cycles par millimètre ou par paires de lignes équivalentes par millimètre. Dans la mécanique des ondes, la fréquence spatiale est communément désignée par ou parfois, bien que celle-ci soit également utilisée pour représenter la fréquence temporelle. Il est lié à la longueur d'onde par la formule De même, le nombre d'ondes angulaires, mesuré en radians par mètre, est lié à la fréquence spatiale et à la longueur d'onde ...
définition de spatial frequency dans le dictionnaire anglais
La définition de la fréquence spatiale dans le dictionnaire est la mesure des détails fins dans une image optique en termes de cycles par millimètre.
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10 LIVRES EN ANGLAIS EN RAPPORT AVEC «SPATIAL FREQUENCY»
Découvrez l'usage de
spatial frequency dans la sélection bibliographique suivante. Des livres en rapport avec
spatial frequency et de courts extraits de ceux-ci pour replacer dans son contexte son utilisation littéraire.
1
Sensation and Perception
However, rather than describing the grating in terms of fine or wide bars,
researchers use a measure called spatial frequency. 3 cycles (a) Spatial
frequency = 3 cycles/degree 1° 6 cycles (b) Spatial frequency = 6 cycles/degree 3
cycles Spatial ...
This volume presents an integrated view of how we perceive the spatial relations in our visual world, covering anatomical, physiological, psychophysical, and perceptual aspects.
Russell L. DeValois, Berkeley Karen K. DeValois both Professors of Psychology University of California,
1988
3
The Essential Physics of Medical Imaging
If A = 0.10 mm, then one complete cycle would occur every 2A = 0.20 mm, and
thus in the distance of 1 mm, five cycles would be seen, corresponding to a
spatial frequency of 5.0 cycles/mm. The relationship between the distance
spanned by ...
Jerrold T. Bushberg,
2002
4
The Perception of Visual Information
Bars that are closely spaced are said to have a high spatial frequency. Usually
they are more difficult to visualize than those that are widely spaced. A line pair,
composed of a light and a dark bar, makes up one cycle or period of a grating.
William R. Hendee, Peter N.T. Wells,
1997
5
Digital Video and HDTV: Algorithms and Interfaces
Horizontal frequency, C/PW Spatial frequency domain I explained in Image
structure, on page 43, how a one- dimensional waveform in time transforms to a
one- dimensional frequency spectrum. This concept can be extended to two ...
6
The Art and Science of Optical Design
pupils in the integration is proportional to the spatial frequency. The integral is
zero outside the intersection of the pupils. The most important limitation is that
optical systems are low-pass spatial filter systems. The maximum frequency
present ...
7
MATLAB for Neuroscientists: An Introduction to Scientific ...
The image in the lower left corresponds to what psychophysicists would call the “
low spatial frequency” channel. It contains the low spatial frequency information
in the image. Notably, it is mostly devoid of sharp edges. This information about ...
Pascal Wallisch, Michael E. Lusignan, Marc D. Benayoun,
2010
8
Fourier Methods in Imaging
In Equation (2.14), the spatial frequency of a real-valued sinusoid was shown to
be proportional to the rate of change of the phase angle. The definition of the
phase of a complex number in Equation (4.27b) may be used to extend the
concept ...
Roger L. Easton Jr.,
2010
9
Handbook of Biological Confocal Microscopy
Spatial Frequencies and the Contrast Transfer Function Sampling theory, like
resolution itself, is often easier to think about accurately in the "spatial frequency
domain" where one considers not the size of objects themselves but the inverse
of ...
However, one could argue that this is nothing more than a restatement of the
spatial-frequency hypothesis developed by Sergent and her colleagues. Indeed,
the receptive field and spatial-frequency theories predict many of the same
results.
Richard J. Davidson, Kenneth Hugdahl,
1996
10 ACTUALITÉS CONTENANT LE TERME «SPATIAL FREQUENCY»
Découvrez de quoi on parle dans les médias nationaux et internationaux et comment le terme
spatial frequency est employé dans le contexte des actualités suivantes.
Contrast between lip and skin color is marker for gender
According to the researcher, it is likely that "colour facilitates processing by both amplifying low spatial frequency signals and adding more gender information. «Medical Xpress, juin 15»
High-frame-rate real-time imaging of speech production
Our first approaches to imaging the upper airway during speech production relied on using short spiral interleaves to rapidly scan the k-space (spatial frequency ... «SPIE Newsroom, juin 15»
Optical illusion could identify refractive need
"The Albert Einstein/Marilyn Monroe optical illusion is an overlaying of two images – one with low spatial frequency and one with high spatial frequency. «Healio, mai 15»
Marilyn Monroe or Albert Einstein: Who Do You See?
It combines a low spatial frequency image with a high spatial frequency image. How close you are to the picture affects how well your eyes can focus and pick ... «Care2.com, mai 15»
What face do YOU see, Einstein or Marilyn? Optical illusion could …
Features with a high spatial frequency (Einstein) are only visible when you're viewing them close up, and those with low spatial frequencies (Monroe) are only ... «Daily Mail, avril 15»
Ricoh reveals pixel-shifting high-resolution mode: Coming soon to a …
Ricoh's new "clarity" enhancing function employs a stack of synthetic images, each having progressively lower spatial frequency content. Looking across these ... «imaging resource, mars 15»
Patients with anorexia nervosa, body dysmorphic disorder share …
The N170 imaging test for low spatial frequency face stimuli demonstrated that the body dysmorphic group presented hypoactivity (P < .016) compared with ... «Healio, mars 15»
Novel endoscope gives clearer view of cancers
The platform employs spatial frequency domain imaging (SFDI) as a means to improve the low-contrast image quality that some endoscopic systems are prone ... «Optics.org, févr 15»
Researchers Develop Device to Find and Destroy Cancer Cells
Sunar's specialized endoscope produces a high-contrast map of the tumor environment using spatial frequency domain imaging. The new technique projects ... «UB School of Medicine and Biomedical Sciences News, janv 15»
Tumor-Blasting Endoscope Seeks And Destroys Cancer Cells
A new endoscope from University at Buffalo (UB) researchers, however, overcomes these shortcomings through spatial frequency domain imaging, according to ... «Med Device Online, déc 14»