RE: [Deinterlace-discuss] Is a non-linear stretch mode planned?

[Eric S. <er...@er...>]

This panaramic stretch feature has actually been on my private list of
features I'd like to see in the future.  I am unfamiliar with any of the
real "guts" of the dTV program so I don't know what size job it would be.

I would guess that it's a hyperbolic transformation in x where as the nor=
mal
anomorphic stretch is linear.  I don't have any evidence to support this,
just a feeling.  If I were to take on the challenge, I'd be sure to do so=
me
measurements with a grid input signal first.  But I do not believe it's
simply a matter of stretching the edges and leaving the center unchanged.

Also, the APAC feature on the 64PH9905 only kicks in when watching 4:3
signal through either the set's Composite or COAX video inputs.  Not thro=
ugh
the YPrPb or VGA inputs which I would guess those of us who have this set
are using with our HTPCs.  Just mentioning this to support the need for
orbiting in dTV.

-Eric

| -----Original Message-----
| From: dei...@li...
| [mailto:dei...@li...]On Behalf Of
| Paul Simoneau
| Sent: Monday, January 08, 2001 6:39 PM
| To: dei...@li...
| Subject: RE: [Deinterlace-discuss] Is a non-linear stretch mode planned=
?
|
|
|
| To add to the point :
|
| I have a very similar HDTV model, the Philips 55PP9701, with the only
| differences being the size and the lack of an integrated ATSC tuner.
| So, I can expand a little bit on what Steve proposes.
|
| The Philips models offer a few of the "standard" widescreen "stretch"
| modes, and like many other manufacturer's sets, the only operate in the
| interlaced mode.   Once a progressive or HDTV input is selected, you're
| stuck in HDTV/progressive-squeeze mode.   No aspect ratio manipulation.
| So, this isn't a problem unique to Philips, but to most HDTV sets.
|
| 1. Standard 4:3 mode : 4:3 frame with black bars on the sides of the im=
age
| 2. 16x9 mode : do the anamorphic squeeze
| 3. Theater-1 : zoom in on a 4:3 image which contains a 1.85:1 letterbox
| 4. Theater-2 : zoom in MORE on a 4:3 image which contains a
| 2.35:1 letterbox
| 5. Panoramic : approximately the middle 1/2 of the 4:3 image is left
|                intact, while the outer 1/4's of the image on either sid=
e
|                are "streeeetched" to fill the rest of the raster and
|                prevent the need for any bars.   The further towards the
|                edge you go, the more stretch is introduced.
|
| I view all 4:3 source material in the Panorama mode.  The stretching
| on the sides isn't too objectionable, and you don't lose any of the
| original source frame (as you do in the Theater-X modes).
|
| (BTW, the Philips already incorporate an "orbit" feature.
| Automatic Phosphor Aging Compensation =96 APAC.)
|
|
| I think this would be a big win for all widescreen users of dTV.
|
| However, given that there would have to be a field-by-field
| manipulation in order to do some kind of stretch function on
| the source data, how much additional CPU horsepower would this
| require ?    Quite a bit, I might imagine.
|
| Would be nice, though...
|
|
| Paul Simoneau
| Integral Access, Inc.
| psi...@in...
|
|
|
|
| > -----Original Message-----
| > From: dei...@li...
| > [mailto:dei...@li...]On Behalf Of
| > Daniel Schmelzer
| > Sent: Monday, January 08, 2001 10:34 PM
| > To: dei...@li...
| > Subject: [Deinterlace-discuss] Is a non-linear stretch mode planned?
| >
| >
| > Hi All--
| >
| > Interesting requests from SteveT on AVS Forum at:
| >
| > http://www.avsforum.com/ubb/Forum12/HTML/006836.html
| >
| > "First, let me say thanks to all the dTV developers for making
| > this awesome
| > piece of software available. This work of art the rivals (and in
| > many ways
| > is better than) the Genesis de-interlacer in my Philips 64PH9905 HD
| > RPTV--particularly with dss and video game sources.
| >
| > I have a question however, regarding the "stretch" mode. Since
| > the majority
| > of dss programming is in 4:3 AR, I have gotten quite used to using th=
e
| > 9905's "Panoramic" video mode. This mode stretches the edges of
| the image
| > but leaves the center untouched. The result of this non-linear
| > stretch is a
| > good alternative to viewing 4:3 material on a 16:9 screen. And while =
not
| > perfect, it is far less distracting than a linear stretch where
| > the entire
| > image is stretched horizontally. I believe the type of viewing mode i=
s
| > standard on most, if not all HD and HD Ready sets. IMHO, it would be =
a
| > wonderful addition to dTV's feature set.
| >
| > On a similar topic, are there any plans to incorporate any form of im=
age
| > "orbiting" (a la yXy) to reduce image burn-in when watching
| > letterboxed or
| > side-paneled material?
| >
| > Thanks again for the wonderful work!
| >
| > Regards -- Steve"
| > _________________________________________________________________
| > Get your FREE download of MSN Explorer at http://explorer.msn.com
| >
| >
| > _______________________________________________
| > Deinterlace-discuss mailing list
| > Dei...@li...
| > http://lists.sourceforge.net/mailman/listinfo/deinterlace-discuss
| >
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