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Restoration tips: MergeHdUp™

4 Replies, 411 Views

This restoration and upscale technique is based on PaNup (https://forum.fanres.com/showthread.php?tid=25); quite a lot of time is passed since I published that, and it's time to revise it using better source, even if the idea is the same - and a new name reflects more the sources used.

In few words, with MergeHdUp™ (read: merged up) it's possible to restore details that were lost during the compression/conversion from the master to the home media, using two (or, better, more than two) video tracks from different sources, even better using different codecs.

The theory behind the idea: the master used for any movie released for home viewing - physical media or streaming - is high quality, uncompressed (or lossless); whatever they were shot on film or digital, normally the horizontal resolutions are 2K or 4K; now, to be ported to HD (1920px wide) or UHD (3840px wide) they could crop sides, or downscale. I don't know how many were actually cropped, but I guess most of them were downscaled.

Let's put apart the UHD home media, and focus on HD: usually we have full HD (1080p) but sometimes we got 720p on some streaming; for example, when the 4K 1.85:1 uncompressed (lossless) master 16bit 4:4:4 4096x2214 is downscaled to lossy compressed 8bit 4:2:0 1920x1038 (or 1280x692), a lot is lost of course, but WHAT is lost is due to the downscale method, codec and bitrate used.

Then, if we take two sources that used the same master, let's say 1080p MPEG-2 and 1080p AVC, it's usually possible to notice that some details are different between them. Now, cleaning each one - denoising, sharpening etc. in a good way, without taking away (too many) details and grain, but only mainly to get rid of compression artifacts while enhancing minute details - then upscaling them using various methods, and finally merging them (equally or based on relative quality) it's usually possible to "squeeze" some details more than doing the same processes using only one source.

Let's see an example of a random movie using two sources, both streaming, one 720p AVC 2.4mbps and another 1080p AVC 13.6mbps:

https://i.postimg.cc/qqQ96g9s/randommovie-720-dn.png
https://i.postimg.cc/51cxjhJS/randommovie-1080-dn.png

I denoised, sharpened, denoised each one, then upscaled them to UHD, and finally merged them equally, all in Avisynth.
Then I put the 1080p on GigaPixel AI 5.4.5, upscaled it to UHD using 100% denoise, nothing else.

Here you can see them compared:
https://screenshotcomparison.com/comparison/27779

single images:
https://i.postimg.cc/BsxJFmQ9/randommovi...-Hd-Up.png
https://i.postimg.cc/npppGqCs/randommovi...-5-4-5.png

some thoughts:
  • at normal viewing distance I prefer the MergeHdUp™
  • processing time for the two images on Avisynth is comparable to one image on GigaPixel
  • using a grain plate should help both
  • it's possible that using newer versions of GigaPixel AI and/or different settings, result may improve a bit
  • using GigaPixel AI to upscale both 720p and 1080p and then merging them lead to a very waxy picture
  • the quality of both sources used here is quite low; using higher quality ones - for example HD-DVD, BD, D-Theater, HDTV - with different codecs - VC1, MPEG-2, AVC, HEVC - results are much better
  • using three or more sources, albeit more difficult, leads to even better result

Thoughts?
Sadly my projects are lost due to an HDD crash... Sad
Fundamental Collection | Vimeo channel | My blog
Interesting. I agree with you that MergeHdUp looks much better in that example. Curious to see this method used in some projects.
A real example from a WIP project... comparisons using three sources - one AVC from WEB, two from HDTV (one AVC and one MPEG-2); each one sharpened then upscaled and averaged, result was finally denoised:

AMZN Vs MergeHdUp: https://screenshotcomparison.com/comparison/27864
AMZN Vs GigaPixel: https://screenshotcomparison.com/comparison/27865
GigaPixel Vs MergeHdUp: https://screenshotcomparison.com/comparison/27866
Sadly my projects are lost due to an HDD crash... Sad
Fundamental Collection | Vimeo channel | My blog
That looks pretty good. Cleans up a lot of the compression artifacts without the wax effects from gigapixel. Looking forward to the final result.
Would you be able to use the new master on D+/Hulu to add in the mix as well? Or would that not work being as it's a different master and possibly a newer scan?
The D+/Hulu is widescreen and, most important, using a different master makes it almost impossible to use it along with other sources, that use old master.
It seems to me that the new master has more details, and most probably is 4K, so a future release in UHD is not impossible!
Sadly my projects are lost due to an HDD crash... Sad
Fundamental Collection | Vimeo channel | My blog

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