[opendtv] Re: The HD Plebo Effect
- From: Craig Birkmaier <craig@xxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Fri, 9 Oct 2009 08:51:29 -0400
At 9:18 AM +0200 10/9/09, Stessen, Jeroen wrote:
This confirms Mark's point that in 1996 it was easy enough to show
an optimal DVD movie
and make people, even experts, believe that they were watching HDTV.
Ironically, it was SD-DVD that provided the impetus for millions of
Americans to buy HDTV displays.
Even today, when I watch DVD on my 56" TV, I find it hard to believe
that it's not HDTV.
The difference is barely visible at 3 m distance. This may also have
to do with high quality
up-conversion (like PixelPlus3 HD). A major benefit of HD is the
near-perfect motion
portrayal, i.e. without the jitter that comes from spatial aliasing
artefacts. With a 24-25 Hz
movie in the DVD player perfect de-interlacing is not an issue
anymore, and the motion
portrayal will be almost as good as HDTV. DVB-S at 720p looks
slightly better (than 576p),
and 1080p from BRD should be better yet, but I don't care anymore. I
need a bigger TV...
Amazing that we're still talking of differences between 0.4, 1 or 2
megapixels, where photo
cameras have already gone to 10-20 megapixels (or so they say).
Enough is enough.
The real issue is the integrity of the samples. With high quality
samples you can easily up or down convert. The display has a native
resolution that is important primarily so that the viewer sees a
sharp picture at the designed viewing distance. You only need "HD"
resolution for VERY large displays viewed at about 3 picture heights.
This is one of the major reasons why Blu-Ray is a big yawn, as SD-DVD
has more than adequate resolution for displays up to about 60 inches.
While it is not practical to have one-size-fit-all, a few sizes may
be sufficient. Apple's iTunes SD content is now 360P while it's HD
content is 720P. 360P is the resolution of the screen on an iPhone.
It looks fine upscaled to my 50" DLP display.
Regards
Craig
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