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: "Shawn Erickson" <email@hidden>
- Date: Mon, 16 Oct 2006 16:55:42 -0700
On 10/16/06, Jeremy Faller <email@hidden> 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.
If you have a CVPixelBufferRef why not just use it directly? Consider
using CVPixelBufferGetBaseAddress(CVPixelBufferRef) or possibly
CVPixelBufferGetBaseAddressOfPlane(CVPixelBufferRef).
-Shawn
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