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60
Features and Configuration Options
Calibir GXM640 IR Camera User's Manual
Camera Synchronization
There are two schemes in which Calibir cameras can be configured to acquire images in
synchronization with other cameras:
Slave: in this scheme, the Calibir camera waits for events; when the specified event is
detected, a frame request is issued to the sensor and the resulting frame is output.
Current cameras support two synchronization events:
External input frame trigger: an electrical pulse on an input pin. The pulse must
have a minimum (configurable) duration (lineDebouncingPeriod) to be considered
valid, in order to provide some tolerance to line noise.
PTP trigger: the Calibir can be configured to acquire images starting at a given
time. When enabled (ptpMode = Automatic), PTP allows a common time base
among
multiple
devices.
Once
a
set
time
has
been
reached
(timestampModuloStartTime) , this triggers a PTP event that triggers the output
of a frame. PTP events can then be generated automatically at a certain rate.
Master: in this scheme, the Calibir generates an electrical pulse on its output pin
whenever it starts acquiring a frame. This pulse can be used for several purposes; for
example it can be used by other camera(s) to start exposure of their sensor, which
provides for much more precise synchronization between cameras.
Cameras can be in free-running or in frame-on-demand mode; see the Sensor Readout
Alignment Mode section for more information.
Note: both Master and Slave schemes can be used simultaneously, in a daisy chain
configuration. For example, a Calibir can be both a slave (wait for an external
trigger pulse) and a master (generate a pulse to trigger another camera).
To enable the external input frame or PTP trigger, set the Trigger Mode (TriggerMode)
feature, available in CamExpert in the Trigger Control Features category, to On.