[opendtv] Re: Math of oversampling - a simple comparison
- From: Doug McDonald <mcdonald@xxxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Sat, 23 Apr 2005 12:28:17 -0500
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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