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Subject: Re: Embedded Image Resizing using FFT
Date: Fri, 21 Nov 2008 19:23:01 +0000 (UTC)
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"Oliver Woodford" <o.j.woodford.98@cantab.net> wrote in message <gg6qrh$afk$1@fred.mathworks.com>...
> "Matt" wrote:
> > As I was saying, the technique is a combintion of sinc-interpolation and subsampling operations...
> 
> I agree. However, sinc filters have long tails, so using them can be slow, and slower still the more you want to reduce your image (as the filters get larger). 

That's true, however, it is known that linear combinations of sincs can be well approximated by linear combinations of cubic B-splines, which are of small support and faster to manipulate. This is one reason why cubic B-splines are so popular -- they provide a computationally efficient way of aproximating sinc interpolation.