Re: [OctDev] imrotate

[Justus P. <Jus...@UL...>]

I feel honored that my code receives this thorough testing :-)

However, I don't see what's wrong with the code. Please explain to me
what you expect imrotate(eye(13),45, "...") to look like. It is
certainly *not* going to be a homogeneous horizontal line since we are
interpolating pixels into a new raster whose spacing is stretched by
sqrt(2). We will therefore see a symmetric structure of varying gray
values between zero and one, and that is wider than one pixel.

Remember that we're rotating images, not matrices.

Convince me that the code is wrong by presenting a correct result, and
I'll see into fixing it.

Cheers,
Justus


Jeff Orchard <jor...@cs...> wrote on Sat, 19 Feb 2005
14:55:39 -0500:

> I'm not sure the bilinear option is working.
>    imrotate(eye(13),45,"bilinear")
> and
>    imrotate(eye(13),40,"bilinear")


Paul Kienzle <pki...@us...> wrote on Sat, 19 Feb 2005
15:47:00 -0500:

> Yes, imrotate seems to be broken for all of bilinear, bicubic
> and nearest.  As Todd pointed out, 'nearest' is particularly
> glaring.

--=20
Justus H. Piater, Ph.D.         http://www.montefiore.ulg.ac.be/~piater/
Institut Montefiore, B28        Phone: +32-4-366-2279
Universit=E9 de Li=E8ge, Belgium    Fax:   +32-4-366-2620