Waifu2x in particular, is one of the oldest and still one of the best AI upscalers for anime and drawings in general, and it has always heavily favored Nvidia. The most known port was not the original Waifu2x by nagadomi, but Waifu2x-caffe, which was much more feature rich, and supported CUDA and cuDNN, both Nvidia exclusive. There was an OpenCL alternative which worked on AMD, but it was only as fast as... Source: over 1 year ago

If you need to enhance the quality of an image that isn't single-coloured; use an AI such as Waifu2x Vulkan or Waifu2x Caffe. Source: almost 2 years ago

It's open source software just as many other projects on github are. Can't really help you translate, but the program is in many languages including English the author is just Japanese Https://github.com/lltcggie/waifu2x-caffe If you scroll down you'll see some English text. Source: almost 2 years ago

The settings I used for the original upscale (using waifu2x-caffe):. Source: about 2 years ago

Resolution improved to 3000x1240 using waifu2x-caffe. Source: over 2 years ago

If it's badly out of focus you can use a specialized deblur tool like smartdeblur. The website looks dated but the program is actually amazing, scroll down to the out-of-focus examples. http://smartdeblur.net/. Source: about 1 year ago

There are tools that can "correct" both Gaussian and motion blur, as an example a car plate from low resolution video stills, example (commercial): http://smartdeblur.net/ before the above the author made a version which was free (but old link is now dead): https://github.com/Y-Vladimir/SmartDeblur/downloads. - Source: Hacker News / over 1 year ago

The biggest problem is when the plate is blurry. Then you can use specialized programs like FocusMagic or SmartDeblur. The second one is like magic sometimes but needs just the right settings via trial and error. Mindblowing examples: http://yuzhikov.com/. Source: over 1 year ago

Smart Deblur[1] is probably one of the best publicly available tools for debluring images like this. It supports a wide array of blur algorithms. I've used it to reverse passwords and identifying details released by security researchers. I was unable to retrieve anything of value from the blurred areas of this image. [1] http://smartdeblur.net/. - Source: Hacker News / over 2 years ago

However, I recently found software that could do it. And also a discussion about doing the inverse convolution . Source: over 2 years ago