Re: [OctDev] imrotate

[Andy A. <ad...@fr...>]

On Fri, 28 Jun 2002, Jeffery Orchard wrote:
> Your concernes about a .m implementation of imrotate are wise. However, 
> my implementation does not have any loops. It applies the rotation by 
> decomposing the rotaion matrix into 3 shears, and then applies the 
> shears using Fourier interpolation. As a result, it uses the 1D fft 
> function heavily.

Wow. That's cool. I didn't realize that you could do a 
rotate with shearing. Is the explanation simple?
Do you know of any (online) references that explain it?

andy

BTW. Dynamically loaded functions for octave are _very_
well designed and are quite easy to write. They're
much easier to learn than (for example) MATLAB mex syntax
or perl xs syntax
_______________________________________
Andy Adler,                ad...@nc...