Gradient-based analysis of non-Fourier motion

Research output: Contribution to journalArticle (Academic Journal)

12 Citations (Scopus)

Abstract

A gradient-based image analysis technique is applied to a class of non-Fourier stimuli. To create the stimuli, n translating sine waves with identical spatial and temporal frequencies, but separated by 2Ï€/n radians, are spatially randomly sampled to produce a Pn stimulus. For ngt-or-equal, slanted2, the stimuli are non-Fourier. Local image gradients are represented in the form of a gradient plot, a histogram which shows the frequency of ranges of temporal gradient/spatial gradient pairs occurring. It is shown that the gradient plots contain features, oriented in gradient space, which indicate correct non-Fourier velocity. As n increases, so too does the complexity of the gradient plots, a finding which may account for the concomitant decrease in perceived coherent motion [Vision Res 37 (1997) 1459]. This paper demonstrates that the gradient plot and associated velocity plots are a useful way of assessing gradient-based motion information. Compared to the traditional Fourier based approach, gradient-based analysis can lead to different judgement of the motion information available to standard models of low-level motion processing.
Translated title of the contributionGradient-based analysis of non-Fourier motion
Original languageEnglish
Pages (from-to)2869 - 2877
Number of pages9
JournalVision Research
Volume42 (26)
DOIs
Publication statusPublished - Nov 2002

Bibliographical note

Publisher: Elsevier

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