10.3 CMOS sensors 65
10.3 CMOS sensors
10.3.1 Details of operation
The CMOS sensors offer two different modes of operation:
• Free running mode (Overlapping integration and readout)
• Snapshot mode (Sequential integration and readout)
10.3.1.1 Free running mode
In free running mode, the sensor reaches its maximum frame rate. This is done by overlapping erase, integration and
readout phase. The sensor timing in free running mode is fixed, so there is no control when to start an acquisition.
This mode is used with trigger mode Continuous.
10.3.1.2 Snapshot mode
In snapshot mode, the image acquisition process consists off several sequential phases:
• Trigger
• Erase, exposure and readout
10.3.1.2.1 Trigger
Snapshot mode starts with a trigger. This can be either a hardware or a software signal.
The CMOS sensors used in mvBlueFOX3 cameras support the following trigger modes:
Description Setting in GenICam
Free running, no external trigger signal needed (for-
merly known as Continuous).
"TriggerSelector = FrameStart"
"TriggerMode = Off"
Image acquisition triggered by command (software
trigger; formerly known as OnDemand).
"TriggerSelector = FrameStart"
"TriggerMode = On"
"TriggerSource = Software"
"ExposureMode = Timed"
To trigger one frame execute the TriggerSoftware@i
command then.
Start an exposure of a frame as long as the trigger
input is below the trigger threshold (formerly known as
OnLowLevel).
"TriggerSelector = Acquisition←-
Active"
"TriggerMode = On"
"TriggerSource = <desired Line>"
"TriggerActivation = LevelLow"
"ExposureMode = Timed"
Start an exposure of a frame as long as the trigger
input is above the trigger threshold (formerly known as
OnHighLevel).
"TriggerSelector = Acquisition←-
Active"
"TriggerMode = On"
"TriggerSource = <desired Line>"
"TriggerActivation = LevelHigh"
"ExposureMode = Timed"
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