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Calibir GXM640 IR Camera User's Manual
Features and Configuration Options
67
Frame-on-Demand Mode
In frame-on-demand mode, the camera sensor outputs frames when a valid trigger is
received.
External
Trigger
External Trigger
debounced
t
debounce
t
debounce
Accepted
trigger
(timestamped)
Rejected
trigger
(counter)
(1)
(1) This second detected trigger is rejected because already one
has been detected in the same frame acquisition period.
Consequently this trigger is not timestamped.
Note:
(Frame-on demand)
(Frame-on-demand)
t
trig-to-out
Frame Transfer
(to Host)
t
debounce
Frame
Acquisition
(Sensor)
Figure 22: External Trigger Wave Diagram: Frame-On-Demand
Note: The maximum frame rate period achievable using this mode is 33.233 ms;
if triggers are received faster than this rate they are ignored. In addition, since the
non-uniformity correction (NUC) applied is factory-calibrated at 30fps, triggering
at a different frame rate may result in less optimal shutterless operation. In this
case,
If the triggered acquisition is from a cold start, the first few images might be of lower
quality as the sensor heats up. When triggering at a constant rate, the trigger frequency
must be stable enough to maintain a constant temperature; if the interval between
frames varies, the quality of the image may be affected.
Related GigE Vision Features
External trigger features are part of the Trigger Control Features and I/O Controls
categories; for complete feature descriptions refer to the Trigger Control Features
Category and I/O Controls Category sections.
