The Vision Toolkit has a lot of functionality, but not so much documentation (that's not really true -- it is often there, just "buried" in the LabVIEW Help).
When I first was introduced to Vision, I had been programming with LabVIEW for several years (and had a decade or so of experience with many other programming languages, none whose names were single letters, though). Vision was a real challenge. I recommend that you have at least 6 months experience with "ordinary" Data Acquisition and Data Processing using LabVIEW before trying to tackle NI Vision.
If all you want to do is to is "Snap" (a single still image, saved as a JPEG or PNG) an image, view it, and superimpose a line, you can cobble together something that will do that (the Picture route possibly being the easiest). If you want to do something with a Video (.AVI) file, this will be considerably more challenging. It is doable -- find yourself a LabVIEW Guru (perhaps your Instructor?) and propose a Joint Project, where you will Learn a Lot (but may do a considerable amount of work).
Bob Schor
