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4 Programming (SDK)

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4.2.3.2 Event / Message Handling

Triggering events for single frame capture

The following figure shows the time sequence when triggering the IS_SET_EVENT_EXTTRIG and

IS_SET_EVENT_FRAME events. The camera is prepared for triggered capture using the

is_SetExternalTrigger() command. An incoming trigger signal at the camera starts the exposure and the

subsequent image transfer. Upon completion of the data transfer, the IS_SET_EVENT_EXTTRIG event signals that

the camera is ready for the next capture. The IS_SET_EVENT_FRAME event is set once pre-processing (e.g. color

conversion) is complete and the finished image is available in the user memory.

Note

The following illustrations show a schematic view of the image capture sequence. The sensor exposure and

readout times and the transmission times depend on the camera settings. The pre-processing time depends on the

API functions you are using (e.g. color conversion, edge enhancement).

* Optional function. The start time and duration of the flash signal are defined by the "Flash delay" and "Duration"

parameters (see is_IO() ).

Events in live mode (image sequence)

The following figure shows the time sequence when triggering the IS_SET_EVENT_FRAME and IS_SET_EVENT_SEQ

events. The camera is set to live mode using is_CaptureVideo() so that it continuously captures frames.

The IS_SET_EVENT_FRAME event is set once pre-processing (e.g. color conversion) is complete and a finished image

is available in the user memory. The IS_SET_EVENT_SEQ event is set after one cycle of a storing sequence has been

completed (see also is_AddToSequence() ).

* Optional function. The start time and duration of the flash signal are defined by the "Flash delay" and "Duration"

parameters (see is_IO() ).

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THORLABS DCU223x User Manual

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