User`s guide

Logging Image Data to Disk

6-49

ans =

Note Because it takes longer to write frames to a disk file than to memory, the

value of the DiskLoggerFrameCount property can lag behind the value of the

FramesAvailable property, which specifies the number of frames logged to

memory.

To verify that a disk file was created, go to the directory in which the log file resides

and make sure it exists. The exist function returns 2 if the file exists.

if(exist(my_log)==2)

disp('AVI file created.')

end

Close the AVI file object — Close the AVI file to make it available outside

the MATLAB environment. Closing the AVI file object ensures that the logged

data is written to the disk file. Be sure to use the value of the video input object

DiskLogger property, vid.DiskLogger, to reference the AVI file object, not the

original variable, aviobj, returned by the avifile function.

aviobj = close(vid.DiskLogger);

Use the original variable, aviobj, as the return value when closing an AVI file

object.

Clean up — Always remove image acquisition objects from memory, and the

variables that reference them, when you no longer need them.

delete(vid)

clear vid