SVS-Vistek SHR 10GigE, Manual

Page: 27 / 103

5.1.1 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
Table: 5-1: 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.
Fig.: 5-1: Noise caused by too much gain
Auto gain
For automatic adjustment of gain refer to auto exposure (see "Auto exposure" on
page 44 ).
When using auto-gain with steps of gain the noncontinuous gain adjustment might
be visible in final image. Depending on your application it might be preferable to
use fixed gain values instead and modify exposure with exposure time.
5.1.2 Resolution
As mentioned in the specifications, there is a difference between the numerical
sensor resolution and the camera resolution. Some pixels towards the borders of
the sensor will be used only internally to calibrate sensor values (“Dark pixels”).
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