Dalsa Linea SWIR GigE Series User Manual page 36

Gain and Black Level Control Details
The Linea SWIR GigE camera provides gain and black level adjustments. The Gain and Black Level
controls can make small compensations to the acquisition in situations where lighting varies and
the lens iris is not easily adjusted. Optimal gain and black level adjustments maximizes the
camera's dynamic range for individual imaging situations. The user can evaluate Gain and Black
Level by using CamExpert.
Features and Limitations are Described Below.
Black Level: This is expressed as a digital number providing +/- offset from the factory
•
setting. The factory setting optimized the black level offset for maximum dynamic range under
controlled ideal dark conditions.
Sensor Gain: The sensor has four selectable conversion gain settings:
•
1: This is the minimum sensor gain setting and allows for the highest sensor full-well and
•
signal to noise ratio but with very low light sensitivity.
• 2: The second gain setting is approximately 10x more responsive than gain 1.
3: The third gain setting is approximately 35x more responsive than the minimum gain.
•
4: The fourth sensor gain setting is the maximum available conversion gain and the camera
•
default operating condition. This represents the lowest configurable full-well setting and the
maximum light sensitivity. The camera responsivity in gain 4 is approximately 70x greater
than when set to gain 1.
Digital Gain: This is expressed as a multiplication factor. Note: Increasing digital gain does
•
not increase the low-level resolution and increases the sensor noise proportionately.
Exposure Controls Details
Exposure Control modes define the method and timing for controlling the sensor integration period.
The integration period is the amount of time the sensor is exposed to incoming light before the
video line data is transmitted to the controlling computer.
Exposure control is defined as the start of exposure and exposure duration.
•
The feature Exposure Mode selects the controlling method for the exposure.
•
• The start of exposure can be driven by an internal timer signal, an external trigger signal, or a
software function call.
• For External Trigger signals, the relationship between an external line trigger and the exposure
period is only applicable while the external line trigger does not exceed the maximum allowable
line rate.
•
34 Operational Reference Linea SWIR GigE Series Camera