Re: CoreVideo to pixel level data (speed path problems)
Re: CoreVideo to pixel level data (speed path problems)
- Subject: Re: CoreVideo to pixel level data (speed path problems)
- From: "John C. Randolph" <email@hidden>
- Date: Mon, 16 Oct 2006 17:01:12 -0700
I tend to do pixel-bashing with the help of Quartz Composer these
days. It's pretty easy to extract whatever pixel-level info you want
from a video stream using a QC "Core Image Kernel" patch with a bit of
GL SLANG code.
What are you trying to do with this red data?
-jcr
On Oct 16, 2006, at 4:39 PM, Jeremy Faller wrote:
All:
I am trying to take iSight data, and get the bitmap data for post-
processing. I am currently using the WhackedTV example from Apple
as a base, and it converts CVPixelBufferRef-->CIImage(s)-->NSImage--
>NSBitmapImageRep, but these operations are expensive and slow. (I
am seeing that converting the images to NSBitmapImageRep can peg a
processor at low frame rates. All of the time is spent in [NSImage
drawImage:], the final step to convert NSImage(s) to
NSBitmapImageRep.)
I am interested in knowing if there are any quick ways to access
the pixel level data in any of the data structures I am using? Does
anyone have any example code?
As a (possibly useful) aside, I am only interested in the red data
(from RGB) of the pixel data. If it helps, I would be glad to
sacrifice G/B/Alpha for just the red.
Thanks in advance.
John C. Randolph,
VP, Engineering
Stealth Imaging, Inc. <email@hidden>
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