"MrPolite" <kderakhshanAtMSN@msn.com> wrote in message
news:TChfc.13677$GU.3603@twister.socal.rr.com...
> I'm using a 5x5 convolution matrix to do some image processing. (I don't
> really know much about image processing). I lose 2 pixels from the edges
of
> the image. When I apply any 5x5 matrix in photoshop however, it doesn't
lose
> any pixels around the edges. So I'm wondering what is usually done with
the
> edge pixels when using a convolution matrix???
>
>

"Hilton" <abc@xyz.com> wrote in message
news:u%23q2yfnIEHA.2244@TK2MSFTNGP09.phx.gbl...
> Not really a C# question, but here goes anyway:
>
> 1. Assume the pixels to be zero
> 2. Assume the pixels to be the same as the real edge pixel
> 3. Mirror the two 'real' edge pixels
> 4. Use the two pixels from the other side of the image (assume image
wraps
> around).
> 5. Don't process the pixel unless the entire matrix 'sees' real pixels.
> 6. Probably a whole bunch of other things to do...
>
> There is no *right* way to do it - it depends on what your matrix is, what
> your image is, and what you're trying to do.
>
> Hilton
>
>
> "MrPolite" <kderakhshanAtMSN@msn.com> wrote in message
> news:TChfc.13677$GU.3603@twister.socal.rr.com...
> > I'm using a 5x5 convolution matrix to do some image processing. (I don't
> > really know much about image processing). I lose 2 pixels from the edges
> of
> > the image. When I apply any 5x5 matrix in photoshop however, it doesn't
> lose
> > any pixels around the edges. So I'm wondering what is usually done with
> the
> > edge pixels when using a convolution matrix???
> >
> >
>
>

MrPolite wrote:
> hey thanks:) good ideas, I think I'll assume the pixels to be the same as
> the edge pixel
>
> umm, what's a good newsgroup for image processing questions?:P would you
> know??