[Greg McKaskle]

Not meaning to be the LV guy, but it is the hammer in my hand ...

If you have LV installed, examples/vision/Motion Estimation shows two similar approaches. They have images in a directory and overlay the vectors of each particle to show how the different HS and LK implementations compare.

If you have images or video to test with, I may be able to validate the approach, even if you later use a different implementation of the algorithm.

Attached screenshot shows the examples. Top one had the particles rotating on a turntable -- obvious from the vectors.

Bottom is some sort of spark/flame with particles moving at different speeds and less applicable I'd assume.

You may also want to look at the other vision SW that came in the FIRST kit, I don't remember the name, but had screen steps to document how to use it and it is pretty cool.

Greg McKaskle