I read the info in this article below and it
seems to imply that moving objects should
not be suppressed, and thus you may be
able to perceive depth relative to the
objects in transit (movement). Everything
else? Well, I'd say everyone might want
you to be able to see non-moving things
as well while driving a heavy truck :-) So,
I'd say, you might suffer suppression
of important static information. Buildings,
parked cars, people on the corner. It is
probably important beyond the test. Sorry.
*hope it helps*
-AI
Lot of words follows, as excerpted from the:
Aviation Research Lab Institute of Aviation
"EFFECTS OF FRAME OF REFERENCE
AND VIEWING CONDITION ON
ATTENTIONAL ISSUES WITH HELMET
MOUNTED DISPLAYS"
by;
Michelle Yeh, Christopher D. Wickens,
and F. Jacob Seagull
Technical Report
ARL-98-1/ARMY-FED-LAB-98-1
January 1998
Prepared for
U.S. Army Research Laboratory
Interactive Displays Federated Laboratory
Aberdeen Proving Ground, MD
Contract DAAL 01-96-2-0003
4.1 Binocular Rivalry
The presentation of HMD information with a
monocular display can range from simple
symbology such as a tracking cross (Gopher, et
al., 1992) or a single bar used to indicate
boundary limits (Williams and Parrish, 1990) to
a map display (Marshak, 1997); the second eye,
meanwhile, views the world directly. The visual
system is presented with two different,
functional images, which it attempts to fuse to
form a single one. Binocular rivalry is the
failure of this process. If the difference
between the images is large, then the visual
system may not be able to fuse the images.
Although the visual system tries to repress the
visibility of one image through binocular
suppression, over time, the dominant image may
shift from eye to eye, so that the two
monocular views will appear as alternating
images (Arditi, 1986; Davis, 1997). Thus, the
images perceived may be unreliable (Kooi,
1993).
In general, the dominant image will be the one
with greater intensity, contour, contrast, and
motion. When presenting images using a
monocular HMD, the stronger image will often be
that on the display since it will be presented
at a much stronger intensity than the scene
viewed by the unoccluded eye. It may not be
ideal to determine beforehand the eye to which
the image should be displayed. Rather, the
display should be presented to the eye with
higher acuity to ensure that the HMD image will
be the dominant view (National Research
Council, 1997).
The occurrence of binocular rivalry is not
limited to the monocular display but may
occasionally occur with binocular
configurations of synthetic images. The
occurrence is rare, as the visual system will
try to fuse the images based on any matching
features in the input received by each eye.
Only when this fails will rivalry result (Blake
and Boothroyd, 1985).
Kooi (1993) examined various techniques and
perceptual phenomenon to minimize the
occurrence of binocular rivalry and enhance the
tendency for image fusion. The goal of the
study was to discover a way to allow one eye to
remain dark adapted while displaying
information on binocular displays. Methods
examined included:
blur suppression, which is configured
by bringing one eye into near focus and
the other into focus at infinity.
Although the eye focused at infinity
remains out of focus, the sharp image
received by the eye in near focus will
suppress the blur seen by the other eye.
motion fusion, which, as the name
implies, is the use of motion to aid
fusion; two monocularly presented random
dot patterns will fuse more readily if
both are moving in similar directions.
In addition, since binocular rivalry
occurs over time for static images, the
use of motion will prevent rivalry by
continuously changing the image.
natural windows, a technique based on
the assumption that the visual system
can tell whether the presentation of two
monocular images conforms to real world
expectations. For example, introducing a
'frame' into the view presented to one
eye allows the visual system to
interpret the two different images to be
one viewed through a window, thus making
use of a naturally occurring occlusion
cue.
brightness averaging, the presentation
of two monocular images at two different
levels of brightness, which can then be
fused into one image with a brightness
equal to the average of the two
different images. Kooi examined some of
these factors in a series of
experiments, in which he collected
physiological and subjective ratings, to
determine how best to configure
monocular images so that two different
images could be fused to form only one.
Images presented from two separate
monitors were displayed separately to each eye
and were evaluated on the basis of ease of
binocular fusion, occurrence of binocular
rivalry, and subjective visual comfort of the
image. Subjects gave favorable reports for the
use of blur suppression but found that while
the addition of a window frame served as an
effective occlusion cue, it was not very
comfortable, rating between the 'barely
acceptable' and 'acceptable' levels for visual
comfort. When two images varying in luminance
were presented, physiological measures showed
greater sensitivity when one eye remained
dark-adapted, and subjects reported a
surprisingly high degree of visual comfort,
which the author attributes to the short
viewing time, i.e., 3-5 minutes.
~snipped [more] boring stuff, mostly unrelated.~ |
