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Chapter 9 Exposure and Readout 65
1
2
3
4
A1 A2 A3
B1 B2 B3
C1 C2 C3
D1 D2 D3
A4 A5 A6
B4 B5 B6
C4 C5 C6
D4 D5 D6
A1 A2 A3
B1 B2 B3
C1 C2 C3
D1 D2 D3
A4 A5 A6
B4 B5 B6
C4 C5 C6
D4 D5 D6
A1 A2 A3
B1 B2 B3
C1 C2 C3
D1 D2 D3
A4 A5
A6
B4 B5
B6
C4 C5
D4 D5
C6
A1 A2 A3
B1 B2 B3
C1 C2 C3
D1 D2 D3
A4 A5
A6
B4 B5
B6
C4 C5
C6
D4 D5
D6
Figure 24. Full Frame at Full Resolution
The time needed to take a full frame at full resolution is:
t
R
+ t
exp
+ t
c
(1)
where
t
R
is the CCD readout time,
t
exp
is the exposure time, and
t
c
is the shutter compensation time.
The readout time is approximately given by:
t
R
= [N
x
· N
y
· (t
sr
+ t
v
)] + (N
x
· t
i
) (2)
where
N
x
is the smaller dimension of the CCD
N
y
is the larger dimension
t
sr
is the time needed to shift one pixel out of the shift register
t
v
is the time needed to digitize a pixel
t
i
is the time needed to shift one line into the shift register
(t
s
, the time needed to discard a pixel, appears below and in later equations)