Image Processing Reference
In-Depth Information
Scanline
placement
D
y
(
S
)
Fast-scan ROS
exposure model
Slow-scan ROS
exposure model
d
kj
=|
y
j
-
y
(
s
k
)|, distance of
k
th scanline from
simulation point
x
i
,
V
i
Conversion of pixel map
to ideal video on
simulation grid
Pixel map
I
(
x
,
y
)
V
(
x
,
s
)
Linear
exposure
profile
I
l
(
x
,
s
)
Sum of all exposures
from all scanlines (
k
):
Σ
k
,
E
l
(
x
i
,
s
k
) × profile (
d
ik
)
MTF of ROS time
response and beam
profile
Pixel
placement
D
x
(
S
)
FIGURE 10.39
Steps involved in modeling the ROS profile.
250
200
150
100
50
0
0
50
100
150
200
250
FIGURE 10.40
Halftoned patch.
times and expose the center third row leaving (p
2 rows on either side
unexposed since the laser beam is exposed at the center of each scan line. The
upsampled image can be mathematically obtained by taking a Kronecker product
with a suitably chosen matrix. De
1)
=
ne the matrix
S
as follows to re
ect
the
upsampling mentioned above:
2
4
3
5
pp
00000
00000
11111
00000
00000
S ¼
(10
:
64)
Search WWH ::
Custom Search