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60 ST-133 Controller Manual Version 3.B
photon shot noise limited, the S/N ratio improvement is roughly proportional to the
square-root of the number of pixels binned.
Figure 29 shows an example of 2 × 2 binning. Each pixel of the image displayed by the
software represents 4 pixels of the CCD array. Rectangular bins of any size are possible.
Binning also reduces readout time and the burden on computer memory, but at the
expense of resolution. Since shift register pixels typically hold only twice as much charge
as image pixels, the binning of large sections may result in saturation and "blooming", or
spilling of charge back into the image area.
++++
2
A2 B2 C2 D2
A4
A3
B4
B3
C4
C3
D4
D3
A6
A5
B6
B5
C
6
C5
D6
D5
A1 B1
C1 D1
+
+
+
++
C2 D2
C1 D1
3
A2 B2
A4
A3
B4
B3
C4
C3
D4
D3
A6
A5
B6
B5
C
6
C5
D6
D5
A1 B1
+
+
+
4
C2 D2
A4
A3
B4
B3
C4
C3
D4
D3
A6
A5
B6
B5
C
6
C5
D6
D5
C1 D1
1
A2
A1
B2
B1
C2
C1
D2
D1
A4
A3
B4
B3
C4
C3
D4
D3
A6
A5
B6
B5
C
6
C5
D6
D5
Figure 29. 2 × 2 Binning for Images
The readout rate for n × n binning is approximated using a more general version of the
full resolution equation. The modified equation is:
t = N N
t
n
t
n
+ N t
Rxy
sr v
2
xi
+
(3)