The following are preprint versions of the text and figs for:
Fixation could simplify, not complicate, the interpretation of retinal flow
Glennerster, A., Hansard, M.E. and Fitzgibbon, A.W.,
Vision Research, 41, 815-834 (2001)
ghf2001_preprint.pdf
Abstract
The visual system must generate a reference frame to relate retinal
images in spite of head and eye movements. We show how a reference
frame for storing the visual direction and depth of points can be
composed from the angles and changes in angles between pairs and
triples of points. The representation has no unique origin in 3-D
space nor a unique set of cardinal directions (basis vectors). We show
how this relative representation could be built up over a series of
fixations and for different directions of translation of the observer.
Maintaining gaze on a point as the observer translates helps in
building up this representation.
In our model, retinal flow is divided into changes in eccentricity and
changes in meridional angle. The latter, called `polar angle
disparities' for binocular viewing (Weinshall1, 1990), can be used
to recover the relief structure of the scene in a series of stages up
to full Euclidean structure. We show how the direction of heading can
be recovered by a similar series of stages.
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