SVS-Vistek ECO Series, Manual

Page: 26 / 104

SVS-VISTEK
Feature description 26
The offset can be limited by a maximum bit value. If higher values are
needed, try to set a look up table.
In case of multi-tap CCD sensors, offset can be altered for each tap
separately (see tap balancing).
6.1.11 Gain
Setting gain above 0 dB (default) is a way to boost the signal coming
from the sensor. Especially useful for low light conditions. Setting gain
amplifies the signal of individual or binned pixels before the ADC.
Referring to photography adding gain corresponds to increasing ISO.
Increasing gain will increase noise as well.
add 6 dB double ISO value
6 dB 400 ISO
12 dB 800 ISO
18 dB 1600 ISO
24 dB 3200 ISO
Figure 14: Table of dB and corresponding ISO value
NOTICE
Gain also amplifies the sensor’s noise. Therefore, gain
should be last choice for increasing image brightness.
Modifying gain will not change the camera’s dynamic
range.
Figure 15: noise caused by too much gain
Auto Gain
For automatic adjustment of Gain please refer to Auto Luminance .
When using autogain with steps of gain the non-continous gain
adjustment might be visible in final image. Depending on your
application it might be preferrable to use fixed gain values instead and
modify exposure with exposure time.