Here’s an example of what I mean by filtering out the low frequency. First an “upscale” to HD:

http://screenshotcomparison.com/comparison/130534

I’ve taken a single screenshot, cropped it to 1920x816, then resized that to 1440x816 (the native resolution it was filmed in), sharpened it and then used waifu2x-caffe to upscale (with denoise set to maximum), and and finally downsized the result to 1920x816. The result is a modest improvement in the overall sharpness of the image, and a significant reduction in the camera noise, but at the expense of bringing the background elements into focus.

Now look what happens when I do the same thing, except this time I filter out low frequency noise first:

http://screenshotcomparison.com/comparison/130537

Notice much of the same detail that is lost in spoRv’s upscale is also lost in mine.