CIImage resize optimisation
CIImage resize optimisation
- Subject: CIImage resize optimisation
- From: Dev <email@hidden>
- Date: Tue, 14 Apr 2009 16:41:53 -0700
Hello,
I use QTKit to grab an image from my webcam. Then i need to resize it into
a smaller image.
Going from My CIImage, i use two filter "CILanczosScaleTransform" and "CICrop"
to get my image at the correct size. (640x480 to 320x240+crop).
Doing only that, my CPU go up to 30% of usage while it is at 12%
without the transformations.
I have a set of C function that works on Bitmaps that is very
specialized to what i m doing, and would
allow me to earn a lots of unnecessary transformations (on windows
that makes my CPU usage to raise to +5% max only) ...
but here the problem, the rendering of CIImage to a bitmap is worse
than the filter usage.
here my question, Is there a way of accessing directly the CIImage
representation so that i can pick my pixels very quickly ?
the aim is to be very efficient of course ...
thanks to all that will help me.
--
Dev
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