Single image super-resolution (SISR) is an emerging technology that uses automated texture synthesis to enhance dithered and blurry photos to nearly pristine resolution. This example from EnhanceNet-PAT shows one type. There's even a free website called Let's Enhance where you can up-res your own images.
The image above compares the three options they currently have for filters at Let's Enhance. They have had some intermittent speed issues as many people try it out, so it may take a while for a new image to process. Great for the price, for sure!