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           Department of Computer Science, University of Toronto
            (LP = D. L. Pratt Building, 6 King's College Road)

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                                  VISION
              LP266, at 10:00 a.m., Thursday 19 November 1992

              Kourosh Pahlavan, Tomas Uhlin, Jan-Olof Eklundh
             Royal Institute of Technology, Stockholm, Sweden

                           " Dynamic Fixation "

Fixation is the link between the observer and the events  in  the outside
world.  It  is  also  the  physical  action  due  to the attentional
mechanisms  embedded  in  an  active  vision  system.  Therefore,  fixation
is a key element in the control strategy of an active vision system.
Although fixation is not necessarily   a binocular  process,  it  have been
considered as such in computer vision.

In computer vision, one has mainly considered  disparity  as  the cue  for
the correspondence between stereo images. The other cue to  correspondence,
blur,  and  the  fact  that  vergence  is  a combination  of  the  two
processes,  accommodative vergence and disparity vergence, has not been
equally  appreciated.  Following the  methodology  of  active  vision  that
allows the observer to control all his visual parameters, it is quite
natural  to  take advantage  of the powerful combination of these two
processes. In this article, we try to  elucidate  this  mutual  dependency
and briefly   analyze   the   cooperation   and  competition  between
accommodative vergence and disparity vergence on the one hand and disparity
and blur stimuli on the other hand. The human fixation mechanism is used as
a  guide-line  and  some  virtues  of  this mechanism  like  symmetric
disparity and integration of blur and disparity are used to implement a
model for  robust  vergence  in isolation. Finally some experimental
results are reported.