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List:       mjpeg-users
Subject:    Re: [Mjpeg-users] y4mscaler: Upsampling to widescreen
From:       Michael Hanke <hanke () nada ! kth ! se>
Date:       2005-12-07 6:57:13
Message-ID: 200512070757.13424.hanke () nada ! kth ! se
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Am Dienstag 06 Dezember 2005 08.29 schrieb Stefan M. Fendt:
> Steven M. Schultz schrieb:
> 
> > I do NOT think it's a good idea. Upscaling ~20-30% (depending if you're
> >
> >in a NTSC or PAL area) degrades the quality so much I couldn't watch 
> >it (yes - I've done it and didn't like the results ;)).
> >
> >  
> >
> Well, I think this heavily depends on the used scaler (and on the one
> watching the result :)... I know an upscaling method which is
> (extremely!) slow but yields to really good (my opinion -- at least)
> results for 2x upscaling... It is not noticable most of the time. I have
> invented that because I thought I would need it for the deinterlacer
> (but I do not...)... it does not fit a LP-Surface (cubic or sinc or...)
> to the data but image-structures, so it really adds resolution which is
> belivable (but not neccesarily realy...)...
> 
> If downscaled to an effective upscaling of 50% it gives a nice
> antialias-effect, too :) Not sure if I will release that...
Ok. Now that you have said "A" I would ask that you should also say "B": Would 
it be possible to get a copy of your filter for experimenting, ideally with 
adescription of the theory behind it since you said it's non-standard.

Michael


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