Grab Frame After a Delay

This facility provides a simple method of synchonising the acquisition of a buffer relative to the current time/position of the VTR. Like the 'Grab single frame' option, the basic synchronisation is by the user pressing a key; however, the frame is not grabbed until the specified time period has passed.

Grab to which buffer ?

An image can be acquired to any valid buffer, whether it is on the frame grabber board or in extended memory. If the destination buffer is in extended memory, then the frame is initially acquired to buffer 0 and then copied to the required buffer. The selected buffer is made the current output buffer during this operation.

Delay ?

This field specifies the delay before which the acquisition is to proceed. The delay should be specified using the normal DigImage time format: minutes:seconds. For more information on this format, see the <shift><f1> general help facility.

Press any key to start delay (Q to abort)

Before issuing this prompt, DigImage places the frame grabber hardware in pass through mode so that it digitizes each and every video frame into the specified buffer (or buffer 0 if the specified buffer is in extended memory). Pressing any key starts the specified time delay. Once the time delay is up, the continuous acquisition process is stopped with the destination buffer holding the last frame to be acquired. If 'Q' is pressed, then DigImage resets the time delay to zero and grabs the frame immediately.

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DigImage User Documentation

Stuart Dalziel, last page update: 19 February 1996