CVTools will provide you with accurate point tracking, and provide
numeric outputs in a structure. It's also slow, buggy, and requires
a zillion support patches.
I saw that a couple of weeks ago and didn't worked because i'm on Snow
Leopard or something, so I couldn't even try...
Apple's CI method does some fancy CI filter work, then uses Area
Average (or something similar?) to condense the image-difference's
motion vectors (converted to colors) into a single pixel value --
you then use the Image Pixel patch to extract its red/green/blue
components, which represent the motion of the area that's been
averaged. For a single point this works quite well (and requires no
fancy patches), but for many points it gets very expensive and slow :/
This sounds more like I'm looking for! :-)
Hope that helps point you vaguely where you're wanting to go :)
Yes of course! :-) many thanks! WE are trying to make an installation
where you have to light the wall or painting with a flashlight, so we
need just the centermost point of the lighted area and use the coord
to trigger music / sounds and get also some room visual feedback. I'll
take a look at it :-)
