[opendtv] [Fwd: Re: Re: Math of oversampling - a simple comparison]

Another forwarded post that should have gone to the list.

- Tom

-------- Original Message --------
Subject: Re: [opendtv] Re: Math of oversampling - a simple comparison
Date: Fri, 29 Apr 2005 07:14:44 -0400
From: Tom Barry <trbarry@xxxxxxxxxxx>
To: Jeroen Stessen <jeroen.stessen@xxxxxxxxxxx>
References: 
<OFBF76826A.C3C1FC60-ONC1256FF2.002C6F36-C1256FF2.002E65D3@xxxxxxxxxxx>

Jeroen Stessen wrote:

> Original: 1920x1080p (cropped from a 2126x1417 original still image). 
> There are 4 scaled versions: via 1280x720, 1024x576, 832x468, 712x400. 
> 
> These 5 pictures should give you a good idea of the continuum of 
> sharpness as a function of the down-sampling ratio. As always, the 
> bandwidth is limited to -3 dB at 73% of the Nyquist limit of the down-
> sampled (intermediate) image, except for the original 1080p image. 
> 

Hey, great new series.  These are now posted at:

        www.trbarry.com/Philips_home_1080p.jpg
        www.trbarry.com/Philips_home_720p.jpg
        www.trbarry.com/Philips_home_576p.jpg
        www.trbarry.com/Philips_home_468p.jpg
        www.trbarry.com/Philips_home_400p.jpg

These allow everyone to better measure the possible costs of
various lower transmission resolutions.  I guess the best way to
proceed is first compare the extremes 1080p vs 400p and get a feel
for what to look for.  Then iterate through them all and see how
and where quality does or doesn't degrade by this process.

Since we will all likely be using 1080p displays someday these are
maybe some good examples of what to expect.

- Tom




 
 
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