Graphics Reference
In-Depth Information
Fig. 1.14
Inhibition patterns
and spot patterns for a range
of radii of inhibition. The
3.0 s inhibition yields a useful
set of 30 stable images with
one or two spots each
Fig. 1.15
How a 4
×
4-pixel
imager might see one, two,
three, or four
light dots
when
viewing a hexagonal array.
For the inhibition pattern we
chose, the three- and four-dot
versions are not allowed, so
only two of the
dots
on
opposite edges (and not on
adjacent corners) will be seen
in those cases
from the detected correlations is shown in Fig.
1.16
, to control the output quadrature
signals shown in Fig.
1.17
.
The clocked logic does not have much state besides the sensor pixels themselves:
just one 16-bit old image to be compared with a new image, and a pair of three-bit
counters for
x
and
y
positions; compare the 4-bit image register and single counter of
the one-dimensional version in Fig.
1.8
. Only two bits per dimension are taken as out-
