We do an edge extend on the boundaries.
jeannette
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> Date: Thu, 6 Sep 2001 09:33:15 -0500
> From: Ted Hill <[EMAIL PROTECTED]>
> Subject: Re: [JAVA2D] BufferedImage Interpolation
> Comments: To: [EMAIL PROTECTED]
> To: [EMAIL PROTECTED]
>
> I like the visual result I'm getting with 2D bilinear, just curious how it
> works because my application requires a high degree of representational
> accuracy; medical imaging.
>
> Ted
>
> ----- Original Message -----
> From: "Kris Schneider" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Thursday, September 06, 2001 8:31 AM
> Subject: Re: [JAVA2D] BufferedImage Interpolation
>
>
> > Ted,
> >
> > Sorry I can't explain the details of what's happening, but if you'd like
> > more control/flexibility in how the edges are handled, you might want to
> > check out the JAI API. It supports the concept of image boundary extension
> > to provide extra source pixels for computing destination pixels.
> >
> > Quoting Ted Hill <[EMAIL PROTECTED]>:
> >
> > > Thanks Micha,
> > >
> > > The scaling works for me, I have no problem with that.
> > >
> > > What I want to know is what Java is doing along the edges when bilinear
> > > interpolation is specified.
> > >
> > > For example, in my 5 x 25 example below, if I turn interpolation off and
> > > use
> > > a screen magnifier, I can see columns which are 5 pixels wide and all of
> > > uniform color/shade.
> > >
> > > However, when I switch the interpolation to bilinear, the columns are
> > > no
> > > longer of uniform color/shade (as is expected), they 'blend' evenly
> > > across
> > > the image from one column to another.
> > >
> > > I understand that the 'inner' columns are 'blends' of their surrounding
> > > pixels.
> > >
> > > But on the far left and right edges, where there are only 'original'
> > > pixels
> > > to one side or the other, I'm not sure how the color/shade is
> > > determined.
> > >
> > > For example, if the original 5 x 25 image is scaled by 5 in the x
> > > direction
> > > resulting in a 25 x 25 image, I would have expected that the first 3
> > > columns
> > > of pixels on the left in the resulting image would either be
> > >
> > > 1. all of uniform color/shade
> > > 2. a blend of the 'original' single pixel column with their background
> > > to
> > > the left.
> > >
> > > but my screen magnifier shows that neither is the case.
> > >
> > > Does anyone know what algorithm the 2D API uses along the edges when
> > > using
> > > bilinear interpolation and scaling for a buffered image?
> > >
> > > Thanks,
> > >
> > > Ted Hill
> >
> > --
> > Kris Schneider <mailto:[EMAIL PROTECTED]>
> > D.O.Tech <http://www.dotech.com/>
> >
> >
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