On-Camera Frame Buffer; Figure 5: Relationship Between Video Mode Change And Triggering - Point Grey Grasshopper Technical Reference Manual

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4.5.10.4.

Changing Video Modes While Triggering

You can change the video format and mode of the camera while operating the camera in trigger

mode. Note that subsequent triggers may be ignored for a period of time, depending on the

nature of the mode/format change and the frequency of triggering. Figure 5 shows the

relationship between changing video modes and triggering.

Any request to change video mode following the end of shutter integration of the last-triggered

image (point A) causes subsequent triggers to be ignored until the video mode reconfiguration

completes. Note that this configuration does not begin until the end of sensor readout of the last-

triggered image (point B), and can last up to 10 ms, especially if the request involves a change in

pixel clock speed. If, for some reason, sensor readout is delayed, the maximum time period that

triggers are ignored is 1.5 s.

To determine if the camera is ready to accept a trigger, read bit 0 of SOFTWARE_TRIGGER

The effects of missed triggers due to a video mode change are likely to

be felt most acutely when triggering in 'overlapped exposure/readout

mode' (Mode 14).

4.5.11.

On-Camera Frame Buffer

The Grasshopper has 32MB of memory that can be used for temporary image storage. This may

be useful in cases such as:

Revised 26-Nov-10

Camera Operations and Features

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