Applying PVQ Outside Daala
draft-cho-netvc-applypvq-03

Document Type Active Internet-Draft (individual)
Last updated 2016-11-13
Stream (None)
Intended RFC status (None)
Formats plain text xml pdf html bibtex
Stream Stream state (No stream defined)
Consensus Boilerplate Unknown
RFC Editor Note (None)
IESG IESG state I-D Exists
Telechat date
Responsible AD (None)
Send notices to (None)
NETVC (Internet Video Codec)                                      Y. Cho
Internet-Draft                                       Mozilla Corporation
Intended status: Informational                         November 14, 2016
Expires: May 18, 2017

                       Applying PVQ Outside Daala
                      draft-cho-netvc-applypvq-03

Abstract

   This document describes the Perceptual Vector Quantization (PVQ)
   outside of the Daala video codec, where PVQ was originally developed.
   It discusses the issues arising while integrating PVQ into a
   traditional video codec, AV1.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on May 18, 2017.

Copyright Notice

   Copyright (c) 2016 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Cho                       Expires May 18, 2017                  [Page 1]
Internet-Draft         Applying PVQ Outside Daala          November 2016

Table of Contents

   1.  Background  . . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Integration of PVQ into non-Daala codec, AV1  . . . . . . . .   3
     2.1.  Signaling Skip for Partition and Transform Block  . . . .   4
     2.2.  Issues  . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Performance of PVQ in AV1 . . . . . . . . . . . . . . . . . .   5
     3.1.  Coding Gain . . . . . . . . . . . . . . . . . . . . . . .   5
     3.2.  Speed . . . . . . . . . . . . . . . . . . . . . . . . . .   7
   4.  Future Work . . . . . . . . . . . . . . . . . . . . . . . . .   8
   5.  Development Repository  . . . . . . . . . . . . . . . . . . .   8
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   8
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     8.1.  Informative References  . . . . . . . . . . . . . . . . .   9
     8.2.  URIs  . . . . . . . . . . . . . . . . . . . . . . . . . .   9
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Background

   Perceptual Vector Quantization (PVQ)
   [Perceptual-VQ][I-D.valin-netvc-pvq] has been proposed as a
   quantization and coefficient coding tool for an internet video codec.
   PVQ was originally developed for the Daala video codec [1]
   [PVQ-demo], which does a gain-shape coding of transform coefficients
   instead of more traditional scalar quantization.  (The original
   abbreviation of PVQ, "Pyramid Vector Quantizer", as in
   [I-D.valin-netvc-pvq] is now commonly expanded as "Perceptual Vector
   Quantization".)

   The most distinguishing idea of PVQ is the way it references a
   predictor.  With PVQ, we do not subtract the predictor from the input
   to produce a residual, which is then transformed and coded.  Both the
   predictor and the input are transformed into the frequency domain.
   Then, PVQ applies a reflection to both the predictor and the input
   such that the prediction vector lies on one of the coordinate axes,
   and codes the angle between them.  By not subtracting the predictor
   from the input, the gain of the predictor can be preserved and is
   explicitly coded, which is one of the benefits of PVQ.  Since DC is
   not quantized by PVQ, the gain can be viewed as the amount of
   contrast in an image, which is an important perceptual parameter.

   Also, an input block of transform coefficients is split into
   frequency bands based on their spatial orientation and scale.  Then,
   each band is quantized by PVQ separately.  The 'gain' of a band
Show full document text