Cheetah Pregius Camera with 10 GigE Vision Interface – User Manual
October 8, 2020
Page
126
of
170
Rev 1.0
Video Amplifier Gain and Offset
Image Sensor’s Analog and Digital Gain
The image sensor allows you to apply up to 48 dB of gain to the image prior to A/D conversion.
The first 24 dB of gain is analog gain and some improvement in noise performance may result.
The camera applies the last 24 dB of gain digitally, which affects both signal and noise equally.
0 dB
24 dB
48 dB
(1x)
(16x)
(251x)
Digital Gain
Analog gain
Digital Gain
Digital gain can be varied from 1x (0 dB) to 4x (12 dB) with a precision of ~0.00097x using the raw
(fine) gain control. There are 3,092 gain steps from 1x gain to 4x gain. Each step increases the
gain by 0.001. Digital Gain does not provide any improved contrast and should be used
cautiously.
Black Level Auto-calibration and Offset
The camera automatically adjusts black level based on measurements of the dark reference lines
at the start of each frame. Imperx recommends leaving the
BlackLevelAuto
engaged
(Continuous). If
SensorBlackLevelRecomended
disabled (set to false), you can set the
BlackLevel
manually
and adjust it from 0 to 4095 counts. Black level will vary with temperature and gain.
Data Output Format
The image sensor digitization is set automatically based on the
Pixel Format
setting. A
Pixel
Format
of 8- or 10-bits enables 10-bits sensor digitization while
Pixel Format
of 12-bits sets
sensor digitization to 12-bits.
With 8-bit output, the camera uses the standard bit reduction process and truncates the least
significant bits as described below.
12-bits sensor digitization
If the camera is set to output 12-bit data, sensor data bits map directly to D0 (LSB) to D11 (MSB).
MSB
Camera Output – 12 bits
LSB
D11 D10 D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
P11
P10
P9
P8
P7
P6
P5
P4
P3
P2
P1
P0
10-bits sensor digitization
If the camera is set to output 10-bit data, sensor data bits map directly to D0 (LSB) to D9 (MSB).
