Re: Image rescaling algorithms
- From: "Francesco" <francesco.serpetti@xxxxxxxxxxxxxxxx>
- Date: Mon, 09 May 2005 05:54:02 GMT
Thanks to Martin and l3,
I'm not using a DSP, actually I use a CPLD, and it's very busy with other
tasks,
so I'd prefer to work in time domain with relatively easy algorithms.
Actually I'm considering to implement virtual pixel in my led panel, but is
out of topic in this NG.
thanks again
"Martin Leese" <please@xxxxxxxxxxxxxxxxxxxxxxxxxx> ha scritto nel messaggio
news:427BCBA2.1050308@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> Francesco wrote:
> > Does anyone know a good algorithm to scale a 640x480 image to a very
small
> > size like 192x144?
>
> You wish to sample by 3.33; this is
> straightforward provided you filter before
> resampling.
>
> The key to effective anti-alias filtering
> (which is what you want to do) is to consider
> what happens in the frequency domain, although
> you will probably prefer to implement your
> filter in the space domain.
>
> A recent thread on this newsgroup will get you
> started, visit:
>
http://groups.google.ca/group/sci.image.processing/browse_frm/thread/9ce4236938e7ad36/77fadf6701e415ba?tvc=1&q=size+*+gaussian+filter+*+best+subsampling++group:sci.image.processing&hl=en#77fadf6701e415ba
> This discusses using a Gaussian filter; this
> is not necessarily the best.
> --
> Regards,
> Martin Leese
> E-mail: please@xxxxxxxxxxxxxxxxxxxxxxxxxx
> Web: http://members.tripod.com/martin_leese/
.
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