[opendtv] Re: BBC Demonstrates HDTV Broadcasts over SD Channels
- From: Tom Barry <trbarry@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Tue, 21 Jun 2005 21:35:16 -0400
Craig Birkmaier wrote:
> When you add the capability to resample 720P up to 1080P for the
> small percentage of homes that will have very large home theater
> installations, it become crystal clear that encoding 1080 for
> emission - either i or P- is a waste of transmission bandwidth.
> Several companies have introduced sophisticated image processing
> chips to do this - they include de-interlacing capabilities,
and in
> some cases motion compensated frame rate conversions that
improve the
> presentation of 24P material.
But it makes a lot of sense for HD-DVD (of any flavor). There you
have surplus bandwidth in the next generation storage media
combined with a likely 24p film sourced movie that is easy to
compress. Add in 4K oversampling telecine machines and it becomes
a fairly easy decision for any vendor that wants to provide the
highest quality (if they really do).
- Tom
> At 7:33 AM -0400 6/21/05, Tom Barry wrote:
>
>>At a viewing distance below about 2 screen widths some people
>>might want to consider 1080p as it becomes affordable.
>
>
> This has already happened. There is only one caveat:
>
> This viewing distance is not practical for lean back entertainment
> viewing except at the extremes (iMax etc). In viewing preference
> tests, average consumers did not choose to sit 3.3 picture heights
> from an entertainment display until the screen size was 117" inch
> diagonal.
>
> If you doubt this, look at how many people sit in the first few rows
> of a theater (unless the screening is sold out).
>
> At viewing distances below 2 picture heights we are talking about a
> "lean forward" viewing experience such as that which is common for
> computing applications. And as one would expect, this is the market
> where people are buying and using displays with roughly 1080P
> resolution.
>
> Unless you have room for a 100" diagonal screen in your home, and the
> requisite 13-14 foot viewing distance (~3.3 picture heights), you
> really do not need 1080P display resolution.
>
>
>>And at a
>>viewing distance above 3 screen widths 480p might be enough for many.
>>
>>But 720p is probably just perfect in between. ;-)
>
>
> When you add the capability to resample 720P up to 1080P for the
> small percentage of homes that will have very large home theater
> installations, it become crystal clear that encoding 1080 for
> emission - either i or P- is a waste of transmission bandwidth.
> Several companies have introduced sophisticated image processing
> chips to do this - they include de-interlacing capabilities, and in
> some cases motion compensated frame rate conversions that improve the
> presentation of 24P material.
>
> Regards
> Craig
>
>
> Regards
> Craig
>
>
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