Gain And Black Level (Offset) - Teledyne Linea 2K CL User Manual

Gain and Black Level (Offset)

The gain and black level controls can make small compensations to the acquisition in situations
where lighting varies and the lens iris can not be easily adjusted. Optimal gain and black level
adjustments maximizes the Linea CL dynamic range for individual imaging situations.
Use the Offset and Gain features to maximize the use of the output dynamic range (especially
when pixel format is less than 12 bits). Typical use is to subtract minimum pixel value expected
and then adjust the gain to up the maximum pixel value to approach full scale.
Features and limitations are described below.
Black Level offset is expressed as a digital number providing a +/- offset from the factory
•
setting. The factory setting optimized the black level offset for maximum dynamic range under
controlled ideal dark conditions.
Digital Gain is expressed as a multiplication factor. Note that increasing digital gain does not
•
increase the low level resolution and increases the sensor noise proportionately.
The parameters that control gain and black level are grouped together in the Camera Control
category.
Camera Control
Single value added to each pixel. Apply a digital addition after an FPN correction: ± 1/8
Offset
of available range. Positive values may be used to measure dark noise.
Depending on the the pixel format, different offset ranges are available:
12-bit mode
8-bit mode
Floating point digital multiplier applied to each pixel. Set the gain as an amplification
Gain
factor applied to the video signal across all pixels: 1x to 10x.
Related ASCII Commands
set sensor blacklevel
ssb
set sensor gain
ssg
Linea CL Series Camera
available range is -512 to +511.
available range is -32 to +31.
Camera Operation • 37