logo Sign In

DrDre

User Group
Members
Join date
16-Mar-2015
Last activity
6-Sep-2024
Posts
3,989

Post History

Post
#759763
Topic
Star Wars GOUT in HD using super resolution algorithm (* unfinished project *)
Time

You could try that, but I would say that a 1080p video from a true 4K source will always be better than one from a super resolution 4K upscale. Although you can reconstruct a good part of the detail with super resolution, some information is always lost in the downscale that can never be retrieved. The 4K upscale from 1080p would contain more detail than the 1080p original, though. 

Post
#759734
Topic
Star Wars GOUT in HD using super resolution algorithm (* unfinished project *)
Time

@lpd You can apply the algorithm to the 1080p original. In that case you would get a 4K ultra high definition video. I would expect it would be about as accurate to the true 4K film (if it were ever released) as the 1080p upscale is to the true original 1080p transfer, provided the 1080p transfer is of good enough quality.

I guess once the powers that be decide to give us the blu ray's of the theatrical editions, this is the next project in line: a 4K upscale for those of us with a UHD TV. 

The great thing is that anyone can try it for themselves, and it's done in a few hours. The infognition software has a free demo for 30 days with full functionality. 

Post
#759732
Topic
Star Wars GOUT in HD using super resolution algorithm (* unfinished project *)
Time

Here is another screenshot comparison. From these examples it is very clear the super resolution is able to reconstruct texture in the skin and clothes, hair, eye lashes and other details. To say that it is only acts as a noise filter is shortchanging many years of scientific research, in my opinion. 

1080p original vs super resolution:

http://screenshotcomparison.com/comparison/118506

Precise bicubic (A = -0.75) vs super resolution

http://screenshotcomparison.com/comparison/118507

1080p original vs precise bicubic

http://screenshotcomparison.com/comparison/118822

Post
#759719
Topic
Star Wars GOUT in HD using super resolution algorithm (* unfinished project *)
Time

Here is a test of the super resolution upscaling on the 2011 Star Wars blu ray. The original sample is 1080p and has been resized to 540p at 8000kps. Subsequently the lower resolution sample has been upscaled to 1080p with the super resolution algorithm.

Update: there is an audio synching problem with the video files. I will fix them and put them back up.

Below are some screenshot comparisions between the original 1080p, the super resolution upscale, and the precise bicubic upscale.

Post
#759476
Topic
Star Wars GOUT in HD using super resolution algorithm (* unfinished project *)
Time

By going to RGB mode of the super resolution software (which is slower, but more precise) you get rid of the edge artifacts, as can be seen in the following comparison:

http://screenshotcomparison.com/comparison/118312

You also get slightly more detail:

http://screenshotcomparison.com/comparison/118314

http://screenshotcomparison.com/comparison/118316

Post
#759377
Topic
Star Wars GOUT in HD using super resolution algorithm (* unfinished project *)
Time

The basic concept for super resolution used for fluorescence microscopy and digital sensors is the same, namely combining multiple low resolution images to obtain a high resolution image. In the first case it is called optical super resolution. In the second case it is called geometrical super resolution. Since a video is nothing more than a sequence of very similar images, the concept has been successfully applied to video as well, for example in forensics. Wikipedia actually explains both pretty well:

http://en.m.wikipedia.org/wiki/Superresolution

Post
#759269
Topic
Star Wars GOUT in HD using super resolution algorithm (* unfinished project *)
Time

Two more comparisons for precise bicubic (A = -0.75) vs super resolution. In this case both sources are uncompressed. In both cases details are more clear in the super resolution version. The grain also seems to be somewhat more visible though, and a number of edge artifacts are clearly visible in the second screenshot, which is of course very undesirable.

http://screenshotcomparison.com/comparison/118200

http://screenshotcomparison.com/comparison/118201

Post
#759162
Topic
Star Wars GOUT in HD using super resolution algorithm (* unfinished project *)
Time

I added a fair comparison: precise bicubic (A = -0.75) vs super resolution

The differences are subtle, but you can see more detail in the eyes, eye lashes, hair in the super resolution one. You could try sharpening the bicubic, but this would also increase the grain/noise.

http://screenshotcomparison.com/comparison/118152