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AW00098504000 Image Acquisition Control

Basler ace Camera Link 97

Determining whether your camera is operating with overlapped or non-overlapped exposure and

readout is not a matter of issuing a command or switching a setting on or off. Rather the way that

you operate the camera will determine whether the exposures and readouts are overlapped or not.

If we define the “frame period” as the time from the start of exposure for one frame acquisition to

the start of exposure for the next frame acquisition, then:

 Exposure will not overlap when: Frame Period > Exposure Time + Readout Time

 Exposure will overlap when: Frame Period  Exposure Time + Readout Time

For more information about determining the frame readout time, see Section 7.7 on page 115.

Guideline for Overlapped Operation with Trigger Width Exposure

If the camera is set for the trigger width exposure mode and you are operating the camera in a way

that readout and exposure will be overlapped, there is an important guideline you must keep in

mind:

 You must not end the exposure time of the current frame acquisition until readout of the

previously acquired frame is complete.

If this guideline is violated, the camera will drop the frame for which the exposure was just ended

and will declare an over trigger error. This situation is illustrated in Figure 27 with the camera set for

the trigger width exposure mode with rising edge triggering.

Frame Acquisition N

Exposure Readout

Frame Acquisition N+1

Exposure Readout

Exp

This exposure was ended too

early. The

frame will be dropped

and an over trigger error declared.

Time

Frame Acquisition N+3

Exposure Readout

ExFSTrig

Signal

Fig. 27: Overtriggering Caused by an Early End of Exposure

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