IMAQ Threshold vi use with *.avi

[mgg]

hello,

   I know that when saving an *.avi movie from IMAQ you have to compress it, so do I have to do the reverse process if I am trying to analyze particles from an *.avi? I am specifically trying to use the IMAQ threshold function with various *.avi files. Any suggestions? I am still very new to LabVIEW so I do not fully know and/or understand all the available functions.

thanks,
mgg

[Jason N]

mgg,

You actually do not have to use compression when you are writing an avi file.  The option to use compression is there if it is a requirement to your application or if you are going to be taking a lot of video and space is an issue, but it is by no means required.  If you do decide to use compression, then when the avi is written a reference to the compression codec used is stored in the avi file.  When the avi file is read back, this codec reference is looked at and the appropriate codec is automatically selected as long as it exists on the computer.  Once you read the avi images into your program you can use any of the available processing functions on them.  Hope this helps.

Jason N