Trigger Overlap

The Trigger Overlap feature determines whether to allow the exposure phase of a triggered image acquisition to occur while the previous image is still being transferred to the host. If Trigger Overlap is disabled, the exposure phase and the image transfer phase will occur sequentially. If the exposure phase ends before the previously acquired image is transferred to the host, enabling Trigger Overlap can lead to dropped frames. If, however, the exposure phase ends after the previously acquired image is transferred to the host, enabling Trigger Overlap can increase the speed of your application.

When Trigger Overlap is disabled, the start of the exposure phase is highly deterministic because the exposure and image readout occur sequentially. When Trigger Overlap is enabled and the exposure begins during the readout of the previous image, the exposure signal must be synchronized with the sensor. This introduces additional offset and jitter to the start of the exposure.

The Trigger Overlap feature defaults to Readout, which means Trigger Overlap is enabled, and allows an exposure to occur during the image readout of the previous frame. Change the Trigger Overlap behavior by setting the Trigger Overlap control in Vision Builder AI, setting the Trigger Overlap attribute in LabVIEW, or by setting the Trigger Overlap in the attribute tree in MAX.