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Directional Deringing Filter

Document Type Expired Internet-Draft (individual)
Author Jean-Marc Valin
Last updated 2016-09-22 (Latest revision 2016-03-21)
Stream (None)
Intended RFC status (None)
Expired & archived
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Expired
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


This document describes a deringing filter that takes into account the direction of edges and patterns being filtered. The filter works by identifying the direction of each block and then adaptively filtering along the identified direction. In a second pass, the blocks are also filtered in a different direction, with more conservative thresholds to avoid blurring edges. The proposed deringing filter is shown to improve the quality of both Daala and the Alliance for Open Media (AOM) video codec.


Jean-Marc Valin

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)