spatial frequency


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spatial frequency

n
(Electronics) television the measure of fine detail in an optical image in terms of cycles per millimetre
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
References in periodicals archive ?
The proposed method uses the spatial frequency of the input frame to classify it as real or fake.
The CS test, which measures both spatial frequency and CS, has superior reflection on real-life visual capability such as reading, face recognition, and driving [4].
Contrast sensitivity at higher spatial frequency was lower with hyperopic refraction values.
(iii) [mathematical expression not reproducible] is the array response in the rth dimension to the mth planar wavefront (m = 1, ..., M) which is function of the spatial frequency [[mu].sup.(r).sub.m];
where p is the spatial frequency vector of the illumination pattern and [[phi].sub.n] is a phase shift.
To make better use of edge information, [15] adopted the modified spatial frequency (SF) as the external input of PCNN, which achieved a preferable fusion performance.
This framework acquires an over complete dictionary from high spatial frequency parts of the image.
The spatial luminance CSF represents the activity of several selective cortical channels at spatial frequency bands that may represent, at least in part, the activity of retinoic-geniculo-ribbed, parallel channels M and P.
In this algorithm, the generalized Parseval's theorem is used to transform the SAR echoes from the spatial domain to the spatial frequency domain.
They derived the relation between the critical spatial frequency and the film thickness and suggested that the surface modulation of thin films is likely controlled by the residual-compressive surface stress created during the separation process.
where [[omega].sub.x] and [[omega].sub.y] are the highest spatial frequencies of the spatial frequency spectrum of the field c(x, y), which correspond to the field components with shortest periods.
Scientists, engineers, and advanced students working in modern imaging systems will use this reference for a review of operations on both 'live optical' images and captured digital images in the spatial frequency domain and how these operations relate to methods in the spatial domain.
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