Grab Single Frame

The simplest way of acquiring an image in DigImage is to grab a single unaltered frame from a continuous video source with the specific timing of the frame provided by hand.

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.

Press any key to grab frame (C for continuous acquisition)

Once the destination buffer number has been specified, the frame grabber will start to digitize each and every video frame it detects. When a key is pressed, this continuous acquisition process is stopped with the destination buffer holding the last frame to be acquired. If <C> is pressed, then DigImage exits this routine without stopping the acquisition process, allowing the buffer contents to continue to be updated as the video source changes. Some of the routines in DigImage (eg. the [;GZ Zoom and Pan] facility) are able to utilise this time varying signal to analyse the image in real time. Any routine in DigImage which is not able to cope with this continuous acquisition will freeze the frame at some appropriate point.

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DigImage User Documentation

Stuart Dalziel, last page update: 19 February 1996