[opendtv] Re: Math of oversampling - a simple comparison
- From: Tom Barry <trbarry@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Tue, 26 Apr 2005 21:25:14 -0400
Doug -
Okay, here's one from Leno. I had to wait to record it last
night. As before the left half of the image is the original and
the right half is filtered to an effective 1/4 resolution of only
960x544, though no actual resizing was done.
As you suggested, a discerning viewer can probably tell the
difference a bit more easily here. I'll let everyone else decide
whether it looks like it justifies 4 times as many pixels, though
of course not 4x the bandwidth.
See: www.trbarry.com/Leno_1080p_compare_qtr_rez.jpg
And for Internet Explorer users, be sure to remember to zoom it to
full size before comparing since your browser may otherwise just
auto-fit it to your screen.
- Tom
Doug McDonald wrote:
> Tom Barry wrote:
>
>>Doug McDonald wrote:
>>
>>The tests couldn't be done fairly if it was interlaced 1080i from
>>video cameras since I'd have to deinterlace it and be accused of
>>losing some detail that way. Isn't Leno video source?
>
>
> Yes, and that's the point. It looks simply great. If you
> convert it to STDV, it will look awful. Interlace is immaterial ...
> it can only hurt. Pick a scene where the camera is static
> and the talking heads not moving.
>
>
>>And I don't think anybody would be very impressed if I showed a
>>544p image could look close to a 720p image. They are just too
>>close anyway.
>
>
> That's where you are wrong, with the first rate 720p. Try some
> ABC sitcoms ... at 720p you will easily read the notes stuck
> to teh refrigerator ... at less than that you won't.
>
>
>
>>But if you can suggest a 1080p (or telecined 1080i)
>
>
> What we don't want is telecined ... for some reason that
> does not look as good.
>
> Doug McDonald
>
>
>
> OTA or cable
>
>>source I can easily record or or any download I'd be glad to do
>>the test again on your source material. Pick the best one you can
>>name.
>>
>>- Tom
>>
>>
>>
>>
>>>Tom Barry wrote:
>>>
>>>
>>>
>>>>And currently most HDTV does not really contain
>>>>that much detail. I have included a link to a captured image from
>>>>the Pilot of the Medium TV series. The LEFT half of that image
>>>>was left untouched.
>>>>
>>>>But on the RIGHT half of the image I filtered out all frequencies
>>>>that would correspond to a spatial resolution higher than a 1/4
>>>>rez of 960x544,
>>>
>>>
>>>
>>>That is simply a TERRIBLE image to compare on, nevertheless,
>>>the right half shows a noticeable case of the dread edge engancement.
>>>It is terribly out of focus for most of the image.
>>>
>>>
>>>I suggest using a much better test: for example, Leno or one of the
>>>better ABC sitcoms (e.g. Less Than Perfect) with a far shot,
>>>or really good sports shots in 720p or 1080i.
>>>
>>>Doug McDonald
>>>
>>>
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>>
>>
>>
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>
>
>
>
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