[opendtv] Re: Samsung Rep admits HDMI won't support 1080p until v.1.3
- From: Craig Birkmaier <craig@xxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Wed, 9 Nov 2005 10:34:53 -0500
At 9:43 AM -0500 11/9/05, Tom Barry wrote:
>I think the final piece of the puzzle would be 60 FPS 1080p capture ->
>720p delivery -> 1080p display, like my often posted John Watkinson
>article sort of suggests. The displays will become cheap, it hides the
>pixel/raster structure even at 3 screen heights, and can be done (if you
>must ;-) ) with MPEG-2/ATSC just fine.
You are almost there!
You are absolutely correct about the decoupling issues as evangelized
by myself, John Watkinson and many others.By the way, the example
that John typically uses is to resample to something more like 576P
then upsample for a 720P display.
You are still ascribing more value to a 1080@60P display than is justified.
Now put this together with your post about your XGA projector.
What you need is a display that delivers enough resolution at the
designed viewing distance for your application, so that you cannot
perceive the raster, but rather, a sharp TV image.
The reality is that 720P is more than adequate until the screen size
approaches 100 inch diagonal at 3 picture heights. This IS NOT
practical for most homes, as the screen is about four feet tall and
eight feet wide.
Keep working on the underlying concepts here and forget about the
numerology. There is WAY TOO MUCH EMPHASIS ON THE BIG NUMBERS, even
as the companies pushing this kool-aid fill those screens with
content that is pre filtered to limit resolution and trashed by
excessive compression.
Think system, not the specs for one component of that system.
And MPEG-2 is already outdated. You will never deliver decent quality
1920 x 1080@60P via a 19.3 MBps ATSC channel, unless the camera is
out of focus.
720P emission encoding is more than adequate for a terrestrial DTV
broadcast system.
Regards
Craig
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