To give you the basic idea, here's an outline of my approach. But NNEDI3 has a special function that does just the upscaling of the image and that's what I'm going to use.
AVISYNTH WARPSHARP SERIES
Robert Martens' SimpleSlugUpscale and tritical's series of edge directed interpolation filters were created for deinterlacing and upscaling. Obviously not deinterlacing, that is reverting interlaced video to progressive scan, is required on this sort of material. Progressive scan is today often used on Blu-ray or PAL DVD video. Upscaling a Progressive VideoHere is my proposed solution for a video with progressive scan. Upscaling in Avisynth – Comparison of Resizers NNEDI apparently stands for something like neural network edge directed interpolation. Winner in his little test was tritical's NNEDI filter. Meanwhile Jean Brünn has made a comparison of AviSynth resizers that are commonly used for upscaling videos. Robert Martens has written a whole guide, providing the necessary tools and a his own autoloaded AviSynth script SimpleSlugUpscale but it does little more than deinterlacing and resizing the image. Proposed Web SolutionsThere are few solution proposed on the internet. But you may think it interesting if you are watching low resolution video on a high definition screen. In short, the increase in quality generally (as in: for most people) does not justify the increase in file size and the additional time spent on preparing and doing the encoding. Yet there is a downside: a higher resolution means more pixels per image that may or may not increase the bitrate required for optimal compression. Thus (proper) upscaling will increase the image quality on a high-definition screen while not reasonably change its quality on a standard-definition screen. Unless a video has the exact resolution defined as standard for a given output device, the video will always be rescaled. Upscaling a video to be encoded will give control over the automated upscaling done by the output devices (television sets or computer monitors). Any video sequence will be upscaled for display on a screen with higher resolution than the video itself. Upscaling Video: What Is ItUpscaling is the technique to increase the image resolution without recourse to an actual source of higher definition.
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