Adimec Camera Link OPAL Series, Operating And Users Manual

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OPERATING AND USER MANUAL OPAL FAMILY
56
IMAGE AND DATA FORMATTING
Offset (only for color) 8.10
In order to enable all captured information to be displayed within the digital domain an offset is applied
on the camera output data. Black is not represented by 0, but by the value programmed with the offset
command.
This ensures that all noise information, even when looking at absolute dark, is quantized and
reproduced on the output
Command syntax: OFSx
Where x = 0..4096, the offset in greylevels on a 12 bit scale.
The actual offset setting can be read back from the camera.
Command syntax: OFS?
Reply message: x
Where x = 0..4096, the offset in greylevels on a 12 bit scale.Note: the offset is defined at the camera
output on a 12 bit scale. That means that if the camera is switched to another output resolutions than
12 bit the actual offset seen on the output will be different.
Offset on Camera Output with an output resolution of 10 bit = x/4
Offset on Camera Output with an output resolution of 8 bit = x/16
See par 8.6 for information about output resolution and the the OR command
For monochrome cameras the offset command is not available. Use the blacklevel command instead
to alter the output offset.
Blacklevel (only for monochrome) 8.11
In order to enable all captured information to be displayed within the digital domain an offset is applied
on the camera output data. Black is not represented by 0, but by the value programmed with the offset
command.
This ensures that all noise information, even when looking at absolute dark, is quantized and
reproduced on the output.
Command syntax: BLx
Where x = 0..4096, the blacklevel in greylevels on a 12 bit scale, before the digital gain stage.
The actual blacklevel setting can be read back from the camera
Command syntax: BL?
Reply message: x
Where x = 0..4096, the black level in greylevels on a 12 bit scale before the digital gain stage.
NOTE: the black level is defined as the black level before digital gain. That means that if the camera is
programmed to another gain than unity the actual offset seen on the output will be different. Assuming
the camera is running in 12 bit mode, the gain value equals y and the black level equals x:
Offset on Camera Output with an output resolution of 12 bit = x.y