Vanishing Initial Sub-Phase

Under certain circumstances, the subdivision of the area-scan acquisition phase into "frame exposure" and "frame readout" does not make sense.

When an area-scan camera is operated in the SYNC mode, the camera delivers frames continuously in a synchronous way. If an electronic shutter is used, the frame exposure occurs systematically during the previous frame readout condition, according to modalities established by the camera itself, not by the frame grabber.

Consequently, it is advisable to identify the acquisition phase with the frame readout condition.

When a line-scan camera is operated in the WEB mode, the elementary pages forming the acquisition sequence are successively issued without intervening gap. The page delay feature is simply irrelevant.

These considerations are summarized in the following drawing: