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@hidden
> http://kineme.net/
>
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