The document discusses why the brain prefers a generic view of visual information and perception. It states that the brain constructs a stable visual world from images and that non-generic views are statistically improbable. It then outlines four rules the brain uses for visual computation, including interpreting straight lines and coinciding lines in an image as being straight and coinciding in 3D. The document argues the visual system assumes images are structurally stable and chooses interpretations that are statistically probable and invariant to changes in viewpoint.
2. Why perception is biased towards
generic positions.
The brain construct a visual world for which the
Image is a stable view.
The probability that we have a non-generic view
is almost zero
3. ● Rule 1
a straight line in an
image is interpreted
as a straight line in
3D
● Rule 2
if the tips of two lines
coincide in an image,
then the brain iterpret
them as coincide in
3D
4. ● Rule 3
the brain interpret
nearby elements in
an image as nearby
in 3D
● Rule 4
always interpret lines
as colinear in an
image as colinear in
3D
5. ● So what we are dealing here is...
● Automatisms for visual computation which go
on, un-noticed
● The image in the eye has two dimensions
therefor, there are countless interpretation in
three dimensions.
6. ● The visual system assumes that images are
stable ( structurally ) with respect to the small
changes of view point.
● In the Generic Rule for visual computation
“Generic” vs “non-generic” applies to perceptual
interpretation. The computational rule says that
if you have several possibilities, choose
interpretations that are robust, statistically
probable, invariant under changes in point of
view.
7. Principle of non-accidental
relations
The Generic Viewpoint Principle states that
perception/visual system is biased against non-generic
situations. It will chose the stable interpretation in case of
ambiguity.
The question is key to visual computation theory: given that
the visual input is intrinsically ambiguous or
lends itself to a variety of interpretations, what guides our
interpretive choices? How come we so
consistently get things right?
8. ● If two visual structures
have a non-accidental
relation then visual
system group them
together and construct
image as if they have a
common origen
9. ● If three or more
curves intersect at a
common point in an
image, brain interpret
them as intersecting
at common point in
space.
10.
11. ● If there is a non-accidental
allignment of
edges and end-points
and if we dont have to
construct the edges and
end point as part of a
visual structure, then
cognitive system creats
a common origen of
alignment.
14. In art, non-genericity is used for 3 different
purposes:
● Aesthetic use......
1: configurational structure to depicting
2: marks ( qualities ) present shapes which
are actually not given in represented or real
space
15.
16. ● Attentional use
proximity ( orientation of gaze toward
significant zone in the painting
20. ● Statistically a non-predictable arrangement of
elements in the picture makes it all the more
intrinsically meaningful.
● Non-generic structure is exploited as a mean
of meaning making art.
