Rewind in Background

To increase the throughput of the particle tracking, DigImage is able to reposition the video tape in preparation of the next acquisition sequence by rewinding it in the background while processing the current group of frame samples. This option allows specification of the speed at which the VTR is to be rewound.

Background rewind: Slow, Medium, Fast, Very fast, Extremely fast or None ?

Choosing the rewind characteristics is a compromise between having the VTR ready for the next group of frames and positional accuracy. Some of the processing during the tracking process requires interrupts to be turned off; this may cause difficulties with some slower PC/ATs if the computer fails to respond to the VTR's frame strobe correctly due to the interrupts being disabled for short periods. For most machines the medium (<M>) or fast (<F>) speed rewind is appropriate. However, if difficulties with the positioning are discovered, it may be necessary to decrease the rewind speed (<S>), or suppress rewind until after all processing of the current group (<N>).

Parent menu

Main Menu

DigImage User Documentation

Stuart Dalziel, last page update: 19 February 1996