Allied Vision Alvium G1 - Page 54

Specifications
54Alvium G1 User Guide V1.7.0
Sensor ADC readout modes for maximum frame rates
If you are using pixel formats that do not require 12-bit sensor ADC readout and
you want to achieve higher frame rates, you can select between readout modes for
12-bit, 10-bit, and 8-bit with some Alvium G1 camera models. See your model’s
specifications.
By default, Alvium G1 models use the maximum bit depth for
SensorBitdepth.
For selected models,
Adaptive mode switches automatically between 12-bit and
10-bit sensor ADC readout, depending on the bit depth of the selected pixel
format. This allows to reduce bandwidth and increase frame rates when only 10-bit
is required.
To enable the 8-bit sensor readout mode, you must switch manually, using
SensorBitdepth. Please observe that the image brightness changes when you
switch between 8-bit sensor ADC readout mode and the other readout modes.
Exposure time behavior regarding ExposureMode
This section informs about how exposure time behaves in the different exposure
modes. All Alvium cameras have an exposure time offset. The exposure time offset
and the exposure time increment depend on sensor and camera characteristics.
Both, the exposure time offset and the exposure time increment, can change if
Width, PixelFormat, or DeviceLinkThroughputLimit are changed. See Value
changes by feature interdependencies on page 227.
ExposureMode = Timed
For all Alvium cameras, exposure time can be set by ExposureTime or
ExposureAuto. For this, ExposureMode is set to Timed.
The selected exposure time is extended automatically:
• If the selected exposure time does not match the available increment, the
camera automatically extends the exposure time to the next increment.
• The exposure time offset is included in the selected exposure time.
ExposureMode = TriggerWidth or TriggerControlled
In addition, most global shutter (GS) cameras can control exposure time by the
trigger signal, with the
ExposureMode set to TriggerWidth or
TriggerControlled (using ExposureStart and ExposureStop).
The trigger controlled exposure time is extended automatically:
• If the trigger controlled exposure time does not match the available increment,
the camera automatically extends the exposure time to the next increment.
• Subsequently, the exposure time offset is added.
You can use
ExposureActive to determine the duration of the exposure time
offset.