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Core Image Color Tracking in GPU Gems 3



Dear all,

Sorry to bother you all with this one. It may not be completely on topic:

I received GPU Gems 3 yesterday and tried out the CIColorTracking example.

The nib in the sample code in GPU Gems 3 appears to be zero bytes.
Does anyone know of an errata page for GPU Gems 3 - I searched but couldn't find?


I quickly constructed a new nib but seem to have an issue. I assume the duck should follow the pink ball ;-).

Image: New Color Tracker Nib

<http://ellington.tvu.ac.uk/images/CIColorTracking001.png>

I am building on Leopard (10.5.2) on a mac book pro. I assume the code is not nvidia specific. I even downloaded xcode 2.5 to see if there were simpler issues with the NIB.

Also: I attempted to use the CI filter(s) in quartz composer, but couldn't quite work out the logic. I guess I could be witnessing the same problem exhibited in the application.

Image: Quartz Composer Patch using CI Color Tracker units

<http://ellington.tvu.ac.uk/images/QuartzComposer001.png>


The 'Color Tracking Area Mean Filter' outputs an image of bounds: {{0,0},{1,1}} pixels.
I've also experimented by setting each CI filter to 'Use Normalised Coordinates'.


Again, any hints or tips would be welcome.

Kind regards, Ian

*******************************
Ian Grant
Senior Lecturer in Digital Art
Faculty of the Arts
Thames Valley University
Ealing, UK
W5 5DX
<email@hidden>
*******************************
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