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Recovery of a highly compressed jpeg (v 2.10.1)

High compressed jpeg images has jpeg artifacts and color subsampling.
There are some methods dedicated to recover jpeg low quality images, although none of it give very good results.

To remove chroma subsampling effects a blurring method should be used. In this case we use DWT 800 with VisuShrink thresholding and Q3.

To remove intensity noise NLM could be used.

original Click on links to select left image
Remove color noise (CWT 1000 VisuShrink Hard / Channels a,b)

Remove noise (NLM 15,16,3 / Channels L,a,b)