Re: Smoothing?

Maybe -

"Image Processing, Analysis and Machine Vision"
Milan Sonka, Vaclaw Hlavac & Roger Boyle
ISBN 0-534-95393-X


------------------------------------------------------
EMail: roger dot rowland at rmrsystems dot co dot uk
"DaveWilson" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> I think i'm gonna need a good book on this after all :p
>
> Any sugestions???
>
>
> "Roger Rowland" <[EMAIL PROTECTED]> wrote in message
news:<[EMAIL PROTECTED]>...
> > "DaveWilson" <[EMAIL PROTECTED]> wrote in message
> > news:[EMAIL PROTECTED]
> > > so if that code uses the low pass filter (1 1 1) (1 1 1) (1 1 1)
> > > smooths
> > > why doesn't (0 1 0) (1 -4 1) (0 1 0) sharpen the image? according to
> > > sources i've found that filter applied in the same manner should
> > > sharpen an image?
> > >
> > >
> >
> >
> > Except that it isn't applied in the same manner. The scaled result of
the
> > high-pass filter should be *added back* to the original pixel value at
that
> > position to sharpen the image. In the previous examples, the output of
the
> > filter *replaces* the original value.
> >
> >
> > ------------------------------------------------------
> > EMail: roger dot rowland at rmrsystems dot co dot uk