Grab a Sequence of Frames
Grab a Sequence of Frames
This DigImage facility offers the simplest method of acquiring multiple
images, each at a specified time, to a sequence of buffers. Basic
synchronisation is governed by specifying an offset time at which DigImage
is to acquire each buffer.
Enter acquisition times (one per line; -1 to finish)
For buffer ##
The first time specifies the offset for buffer 1, the second for buffer 2
and so on. Note that for extended memory buffers there is a slight delay as
DigImage copies from buffer 0 to the required extended memory buffer,
effectively setting a lower limit on the spacing for these buffers (the
limit depends on the speed of the PC/AT being used, but lies in the range
0.2s to 0.6s). Note that the times must be specified in chronological order
as DigImage does not offer control over the VTR using this option (see the
Video control submenu for more flexible acquisition proceedures). Any
attempt to move backwards in time will produce the message 'Can not go
backwards in time!' A negative value of time is used to terminate the list
of time offsets.
Base name of file to be saved (no extension). No name => do not save
As an option DigImage can be forced to save all the buffers acquired to a
sequence of files if a file name is given (if no name given, then the
buffers will not be saved to files). The file names have the form
File_Name.001 for buffer 1, File_Name.002 for buffer 2 and so on. The files
are in a binary form without any form of encoding or compression. The first
two bytes specify the number of rows, while the third and fourth bytes
specify the number of columns. The remainder of the file is a byte stream
giving the intensity of each pixel and is ordered by column from the top
left of the buffer.
Press any key to start delay
The acquisition process and delay clock are started by pressing any key.
Once all the buffers have been acquired, their contents will be written to
the specified files (if this was requested) before returning control to the
Grab & Display submenu.
Message:
Writing buffer to file...
Message:
Can not go backwards in time!
Parent menu
Main Menu
DigImage User Documentation
Stuart Dalziel,
last page update: 19 February 1996