NED
49
UME-0114-01
RMSL4K100CP
4.8 Setting Gain
Gain can be adjusted by setting analog gain (6 steps, x1~x18) or digital gain (512
steps, x1~x2). In both cases, increasing the gain setting increases the slope of the
camera’s response curve, so that the output saturates at a lower level of light.
Conversely, with less light, a higher output can be obtained; that is to say, the cameras
sensitivity has been increased.
Ｆ
s
：Saturation Output(DN)
Ｓｅ：Saturation Exposure(DN)
Se
Volume of Light（lx・s）
Output data(DN)
Ｄ
f
：Dark Current(DN)
Fs
Dｆ
0
Minus gain
Plus gain
Figure 4-8-1 Gain Adjustment
Gain-Sensitivity at digital gain x1, pixel correction: default, factory white correction data
is shown below.
Table 4-8-1 Gain-Sensitivity
コマンド
gax
Analog gain
Sensitivity V/(lx
・
s)
0
x1(0dB)
75
1
x2(6dB)
150
2
x4(12dB)
300
3
x8(18.1dB)
600
4
x10(20dB)
750
5
x18(25.1dB)
1350
The magnification calculating formulas of the digital gain are as follows.
Digital gain setting value
：
VAL(0
～
511)
、
Digital gain magnification
：
DGAIN(1
～
2)
DGAIN = 1 + VAL/511
VAL = (gain -1) x 511
Notes:
1)
Gain and noise values are proportionally related. Adjust amount of gain in
accordance with the requirements of your camera system.
2)
We recommend using gain from x1 to x8.
