RE: [Deinterlace-discuss] Is a non-linear stretch mode planned?
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From: Eric S. <er...@er...> - 2001-01-09 23:29:28
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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 | > | | | |