[opendtv] Re: AW: Re: Some results - 1080p @ 60 is Next?
- From: "John Shutt" <shuttj@xxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Fri, 4 May 2007 15:45:47 -0400
Hans,
Thanks for clearing that up. I understand the current limitations you had
to overcome in working with 1080p50. It's not a common production format,
and as you pointed out hardware cross-converters are not common for the
format.
I have long been a believer in 720p for emission, but I was just surprised
that uncompressed 720p was found superior to uncompressed 1080i when
upconverted to 1080p in the display.
One would assume you (EBU) included the uncompressed images as a control
against the variable factor of compression, so I don't think one can
discount the results totally. Intuitively, with identical horizontal pixel
placement, I would have guessed that you could obtain superior 1080p from
1080i, rather than from 720p as your testers chose.
It leads one to want to explore when in the chain you can safely move into
the 720p realm. Do you buy an oversampling camera but work in 720p, or do
you work in 1080i exclusively for production and archive, and only convert
to 720p during emission?
However, your results do speak volumes to those broadcasters who are using
720p as the emission format. It apparently cross-converts to 1080p nicely,
and it should be ideal for native 720p displays as well.
John
----- Original Message -----
When you view the UNCOMPRESSED images on the matrix displays you have in
the
720p/50 case the impact of the spatial upconversion and in the 1080i/25
case
the de-interlacing. In practical terms however it does NOT MATTER what the
results are for uncompressed. The important aspect is how the images are
perceived after emission encoding and presentation in the home. Here we
have
the impact of the H.264/AVC encoder (we used the software encoder in coop
with the HHI, because of 1080p/50). You have seen the results.
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