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4 Programming (SDK)

101

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()).

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