> Several variants of the coding procedure Asymmetric Numerical Systems (ANS) may be found in most modern codecs, such as AV1, Z-Standard compression, or even rANS in JPEG XL.
... this is hardly the fault of the JPEG XL developers though, that's the US patent system being ridiculous. Also, in the current discussion context that patent screws over any new compression format, not JPEG XL specifically. Note: general compression, not just image compression (ok, sure, QOI isn't affected. QOI also isn't relevant here).
It's obviously a defensive patent anyway, because between AV1, zstd and JPEG XL Microsoft would have to fight an alliance of literally everyone else out there if they'd plan on suing anyone.
AV1 does not use rANS in any form. The quoted sentence is simply incorrect. However, any necessary patent claims owned by Microsoft, an AOM member, would be freely licensed to everyone for use in AV1 implementations if it actually did use rANS. Which it doesn't.
> Several variants of the coding procedure Asymmetric Numerical Systems (ANS) may be found in most modern codecs, such as AV1, Z-Standard compression, or even rANS in JPEG XL.
... this is hardly the fault of the JPEG XL developers though, that's the US patent system being ridiculous. Also, in the current discussion context that patent screws over any new compression format, not JPEG XL specifically. Note: general compression, not just image compression (ok, sure, QOI isn't affected. QOI also isn't relevant here).
It's obviously a defensive patent anyway, because between AV1, zstd and JPEG XL Microsoft would have to fight an alliance of literally everyone else out there if they'd plan on suing anyone.