Thread Rating:
  • 2 Vote(s) - 5 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Restoration tips: PaNup™
#1
PaNup™ - PAL and NTSC upscaled

This technique should be used to obtain a good quality upscale, when two different standard definition video are available, better than using one source only.

The idea is simple: take two captures of the same content, one PAL, one NTSC, then merge them to “squeeze” every bit of details from it… everyone knows that a PAL capture has 576 horizontal lines, while NTSC has 480… now, when a movie was transferred to video, usually original resolution was higher than that (not all the times, but often); so, the PAL and NTSC “received” different lines of image… see the next image (obviously intentionally exagerated…):

[Image: hd_pal_ntsc.png]

As you can see, the red, green and blue lines have different thickness in PAL and NTSC; the aim of this technique is to combine those different lines to recreate an image closer to the original one.

To test my theory, I took some high definition images, resized each dimension to 1/3 to simulate NTSC, and to 2/5 to simulate PAL, then I wrote a script to mix and upscale the simulated PAL and NTSC images. Here you are the close-ups of the results; PAL and NTSC are the simulated images upscaled with pointresize, PALup and NTSCup are upscaled using a bicubicresize, to simulate a simple upscaler, PaNup™is my script (oh, how much I love acronyms – PaNup™=PAL and NTSC upscaled) – no noise reduction is used:

[Image: SANY0005_closeup.png]
[Image: HDTV1_closeup.png]
[Image: Men_Funny_Constructicons_Eating_Crash_Test_Dummi.png]

Of course, the validity of this tests are questionable, as the PAL and NTSC images are simulated; nevertheless, these give an idea of what could be achieved using “simple and poor” low definition media, like VHS or better laserdisc, and DVD too! Not HDTV, OK, but still quite a good result.

The problem is, in real life, it’s close to impossible to find a movie which has a PAL and NTSC version that match each other 100% – usually they use different masters, so cropping and color grading are different… but, in those almost-impossilbe cases where a PAL and a NTSC laserdisc (and VHS) are virtually the same, the ideal condition is to capture the PAL at 768×576 and the NTSC at 640×480 (actual letterbox images at 2.35:1 will be 768×326 and 640×272, at 1.85 will be 768×416 and 640×346); if the capture card could capture at 720×576/480, only the Y axis will benefit – this is also the case of DVD.

***

I tested PaNup using “The Abyss” PAL DVD letterbox, and NTSC R6 DVD, anamorphic; overlaid at 40% PAL and 60% R6 (as it has more resolution); applied at the end a grain plate
http://screenshotcomparison.com/comparison/61161

Another example: Aliens Vs Predator: Requiem
http://screenshotcomparison.com/comparison/63368

Star Wars - A New Hope 1997 (adding Super Resolution):
http://screenshotcomparison.com/comparison/125558
(more comparisons on post #18)

It could be an interesting technique to restore movies that are not available in HD, but only as PAL and NTSC DVDs – or letterbox and anamorphic DVDs, OR, just missing shots not present in HD, but only on PAL and NTSC DVDs... or, if someone would like to make a fan extended edition, this could be used to improve the quality of SD deleted scenes!
Reply
Thanks given by:
#2
I don't find The Abyss frame that spectacular, but the one from AvP is truly amazing!

All this techniques are yours, right? I mean, you "invented" them. Or am I wrong?
Reply
Thanks given by:
#3
As far as I know, yes... it's why I put the little trademark symbol near them! Wink
Reply
Thanks given by:
#4
That's awesome. Great work spoRv! Looking forward to more of your efforts. Halloween and The Thing are benchmarks in my opinion.
Reply
Thanks given by: spoRv
#5
Thanks a lot!

I think Halloween is the best project I've ever made, because resemble very closely the colors of the 1999 THX DVD; The Thing was my first project and, despite the fact is waaay better than BD (and HD-DVD) color grading IMHO, in the meanwhile I learned a lot of new techniques and refined old ones, so I think it could be improved.
Reply
Thanks given by:
#6
I wish there was a PAL version of the extended cut of the Alamo. That way we could rebuild the longer cut of the Alamo in HD, since MGM will never resort it.

Speaking of The Abyss, Andrea have you thought of using this process on the Full Frame laserdisc?
Reply
Thanks given by:
#7
Is there any full frame PAL laserdisc of The Abyss?
Reply
Thanks given by:
#8
Looking at lddb, I guess not. Damn that would of been great use of this technique.
Reply
Thanks given by:
#9
...PAL and NTSC will do, too!
Reply
Thanks given by:
#10
This technique is amazing
Reply
Thanks given by: spoRv


Possibly Related Threads…
Thread Author Replies Views Last Post
  Restoration tips: Axis-Aligned Polygon Aspect Ratio™ (a.k.a. UAR™) spoRv 39 25,238 2019-02-03, 03:12 AM
Last Post: CaveDoctor
  Restoration tips: DaLucc™ spoRv 4 2,145 2019-01-16, 01:48 AM
Last Post: CaveDoctor
  Restoration tips: De-Dutch™ spoRv 5 2,019 2018-04-12, 02:55 AM
Last Post: spoRv
  Restoration tips: analog capture spoRv 9 5,519 2018-03-29, 05:02 PM
Last Post: Jetrell Fo
  Restoration tips: the Slice Technique™ spoRv 1 2,883 2018-03-07, 07:42 AM
Last Post: spoRv
  Restoration tips: De-logo Patch Technique™ spoRv 10 5,772 2018-02-05, 06:18 PM
Last Post: Colek
  Restoration tips: HD matrix surround™ spoRv 10 7,179 2017-11-07, 02:35 PM
Last Post: TomArrow
  Restoration tips: Overlap matching spoRv 14 7,764 2017-09-06, 07:46 AM
Last Post: spoRv
  Restoration tips: Soft+Open Matte™ (a.k.a. YAO™) spoRv 15 7,811 2017-07-01, 04:03 AM
Last Post: spoRv
  Audio tips: DTS-HD MA encoding needed delay spoRv 4 3,344 2017-06-03, 08:54 PM
Last Post: Chewtobacca

Forum Jump:


Users browsing this thread: 1 Guest(s)