> I am trying to demonstrate diffraction and scattering processes, for which I > would very much like to implement a live FFT of the iSight camera input. I > have read that there was a discussion a while ago on the topic of FFT > elements in Quartz composer, but I have not found any resolution for that. Is > there an image FFT module available in QC?
The only built-in FFT functionality in QC is from the Audio Input patch, where it gives you a 12-16 band frequency amplitude output. Outside of that, there's no additional FFT functionality (including 2D FFTs for images). However, you can implement an FFT yourself using OpenCL, or possibly CoreImage. There was a developer example that had JPEG2000 compression/decompression (wavelet based, so not strictly FFT, but similar) implemented in CoreImage in QC. (I don't have a handy link to that at hand though, unfortunately :/) -- Christopher Wright [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]
