[opendtv] Re: News: Philips Rolls Out 'Ambilight,' Cineos HDTVLines
- From: Tom Barry <trbarry@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Thu, 24 Jun 2004 07:29:19 -0400
Jeroen -
I was an avid Buffy fan while the show was running, ordering the R2
DVD sets from Amazon UK because they were not available soon enough in
the USA. But I felt totally betrayed when they canceled the show and
have not purchased the last few seasons. Guess I'll have to move on.
;-)
But the episode was somewhere from Season 6, probably Jan 2002 or
slightly earlier.
I'll repeat the main theme from my web posting on 4:3/16:9 issue.
There doesn't seem to be one particular trick for displaying 4:3 on
16:9 screens but instead using all of them in moderation pleases at
least me.
I'm sorry to hear that "ambilighting" the black bars does not seem to
be well received. The reason I wrote the filter to do it was because
I could not even visualize the effects, so it was easier to just make
a filter and see it. But after doing so I'm convinced I would prefer
that option if available.
Can you explain why it seems to be harder to get away with vertical
warping? Say when trying to display wide screen pictures on a 4:3 set?
I can confirm it does not seem to work as well but have never really
understood why.
- Tom
jeroen.stessen@xxxxxxxxxxx wrote:
>
>
>
> Hi,
>
> Tom Barry <trbarry@xxxxxxxxxxx> wrote:
>
>>Hey, I want a cut too. ;-)
>
>
> ;-)
>
>
>>But not for illuminating the walls but instead for putting 'Ambilight'
>>on the black borders of wide screen TV's when displaying 4:3 material.
>>This avoids burn in and makes the bars visually less obtrusive.
>>I think the black borders are way more important than the room.
>>See my impassioned plea and suggested video filter from a few months
>>ago: www.trbarry.com/Displaying_4x3_on_16x9.htm
>
>
> You a Buffy fan too ?!
>
> You do know that from Season 4 (?) onwards the whole series has
> been shot in 16:9 ! BBC even broadcasts them in Anamorphic
> (digital on DVB-S and DVB-T) and letterboxed (analog). I am
> collecting all the DVDs, waiting for season 7 to appear.
> If you can tell me from which episode and timestamp you got that
> picture then I might send you the original widescreen sample.
>
>
> The idea of putting neutral grey side bars next to the picture,
> content-dependent or not, has been tried. It helps against
> differential burn-in, but it is generally not appreciated. :-(
>
> My Y1992 CRT-RPTV applies pixel repetition on the left and right,
> and then closes 2 shutters behind the screen to hide these areas.
> Then the CRTs are well protected against burn-in, but the side
> panels are obviously pitch-black.
>
> The non-linear warp has been a standard feature of all of our
> widescreen TVs since 1994 or so. The original idea was patented
> by RCA and first applied by JVC, simply by increasing the value
> of the S-correction capacitor. This increases the scanning speed
> near the edges, but this unfortunately also reduces the edge
> brightness a lot. For letterboxed movies there is of course the
> "Movie expand" mode, both 16:9 and 14:9.
>
> Later we have introduced the "Panic" and "Picnic" ICs, where the
> warping is done by sample-rate conversion. Internally we call
> this "Panorama mode", for the customers it's called "Superwide".
> I believe that it has done a lot for the acceptance of 16:9
> displays. (Emmy award !) The optimum is if the warping waveform
> is a pure (i.e. full-width) parabola. You might want to try that.
>
> There have been suggestions of applying the reverse function,
> which we call "Amaronap" or "Paranoia" mode, e.g. for putting
> a 16:9 program on a 4:3 screen, or for applying it vertically.
> This method is perceptually much less attractive. With modern
> scaling hardware all this is technically relatively easy to do.
> The challenge is more in applying it with good taste. This
> involves all sort of compromises between horizontal and vertical,
> warping and cropping, playing with the overscan area, ...
>
> Greetings,
> -- Jeroen.
> |-----------------------------+---------------------------------------|
> | From: Jeroen H. Stessen | E-mail: Jeroen.Stessen@xxxxxxxxxxx |
> |-----------------------------+---------------------------------------|
> | Building: SFJ-5.22 Eindhoven| Philips Digital Systems Laboratories |
> |-----------------------------+---------------------------------------|
> | Phone: ++31.40.27.32739 | Visiting & mail address: Glaslaan 2 |
> |-----------------------------+---------------------------------------|
> | Fax: ++31.40.27.32572 | NL 5616 LW Eindhoven, the Netherlands |
> |-----------------------------+---------------------------------------|
> | Pager: ++31.6.6513.3818 | Visit us: http://www.pdsl.philips.com/|
> |-----------------------------+---------------------------------------|
>
>
>
>
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