Is there a URL for the Apple Core Image example? -- Glen
On Nov 3, 2009, at 1:05 PM, Christopher Wright wrote: >> No it's fine. I've just seen motion trackers that analize 2 frames and use >> this difference for something, I haven't found quit yet a 'single point' >> tracker. >> >> I'm usind OSC Reciever and sender to communicate already... but I'm missing >> this detail... the coord of a single point, and follow these. > > > There are 2 general ways to do this that I've seen: use CVTools (freely > available at kineme.net), and hope some kind soul helps fill in the blanks, > or use Apple's CoreImage method. > > 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. > > 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 :/ > > Hope that helps point you vaguely where you're wanting to go :) > > -- > [ christopher wright ] > [email protected] > http://kineme.net/ > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Quartzcomposer-dev mailing list ([email protected]) > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/quartzcomposer-dev/speckert%40specktech.com > > This email sent to [email protected] _______________________________________________ Do not post admin requests to the list. They will be ignored. Quartzcomposer-dev mailing list ([email protected]) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/quartzcomposer-dev/archive%40mail-archive.com This email sent to [email protected]
