Forwarded Knusperli - JPEG decoder

[zubzero]

Ruud van Asseldonk —a software engineering intern at Google Research's Zurich-based compression team— has opensourced a new jpeg decoder, Knusperli. It shows a new approach that decodes JPEGs in a way that remains true to the original but creates less block error boundaries.

The boundary continuity is imposed in DCT space within the quantization boundaries, i.e., the properties of the image are not changed into something that would produce a different DCT quantization results. It doesn't solve all problems of jpeg compression, but would mitigate the artefacts in quality range 50-85 nicely.

Knusperli builds on our previous work with Guetzli and PIK.

https://github.com/google/knusperli

[Bhikkhu Pesala]

It looks like a worthwhile improvement without licensing issues.

I have forwarded the request to Irfan Skiljan.

[zubzero]

With the right point, it is better to implement it as an additional processing tool (AntiJPEG). So it will be correct.
since this is not an official extension of JPEG format ...

p.s. if JPEG to consider in the form of MozJpeg+Lepton+Knusperli to grips with negligible loss (50-85), it is very interesting. And even superior to other modern formats. But this is a sandwich/crutches.