The AV1 Constrained Directional Enhancement Filter (CDEF) · HackerPapers discussionshttps://hackerpaper.kaipfister.de/p/1602.05975/Collected HN comments and submissions linking this paper.enMon, 02 Nov 2026 11:16:22 GMTThe AV1 Constrained Directional Enhancement Filter (CDEF) — mentioned by twotwotwohttps://news.ycombinator.com/item?id=16806909urn:hackerpapers:mention:1602.05975:16806909Wed, 11 Apr 2018 00:09:21 GMT<p>Comparing HEVC-based and AV1-based: there&#x27;s a tech demo (that I&#x27;ve posted here...a lot now heh) at https://people.xiph.org/~tdaede/av1stilldemo/. Both AV1 and x265 intra look great. If the artifacts when you compare to originals bug you, remember this is just a test at a level where JPEG is painfully blocky, and you can go higher! Visually, I think AV1 adds less DCT-ish noise, but tends to blur small, low-contrast details a little more than x265. (Compare the ends of tree branches on the default image, Crepuscular Rays, or faraway tiles and details in Mercado dos Lavradores. Haven&#x27;t done…</p><p><a href="https://hackerpaper.kaipfister.de/p/1602.05975/">Paper and discussion history</a>. A mention is not an endorsement.</p>cs.MM