Constrained Low Pass Filter
draft-midtskogen-netvc-clpf-04

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Network Working Group                                      S. Midtskogen
Internet-Draft                                               A. Fuldseth
Intended status: Standards Track                               M. Zanaty
Expires: September 11, 2017                                        Cisco
                                                          March 10, 2017

                      Constrained Low Pass Filter
                     draft-midtskogen-netvc-clpf-04

Abstract

   This document describes a low complexity filtering technique which is
   being used as a low pass loop filter in the Thor video codec.

Status of This Memo

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

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   This Internet-Draft will expire on September 11, 2017.

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   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Definitions . . . . . . . . . . . . . . . . . . . . . . . . .   2
     2.1.  Requirements Language . . . . . . . . . . . . . . . . . .   2
     2.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Filtering Process . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Further complexity considerations . . . . . . . . . . . . . .   6
   5.  Performance . . . . . . . . . . . . . . . . . . . . . . . . .   6
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   7
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   Modern video coding standards such as Thor [I-D.fuldseth-netvc-thor]
   include in-loop filters which correct artifacts introduced in the
   encoding process.  Thor includes a deblocking filter which corrects
   artifacts introduced by the block based nature of the encoding
   process, and a low pass filter correcting artifacts not corrected by
   the deblocking filter, in particular artifacts introduced by
   quantisation errors of transform coefficients and by the
   interpolation filter.  Since in-loop filters have to be applied in
   both the encoder and decoder, it is highly desirable that these
   filters have low computational complexity.

2.  Definitions

2.1.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

2.2.  Terminology

   This document will refer to a pixel X and eight of its neighbouring
   pixels A - H ordered in the following pattern.

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                           +---+---+---+---+---+
                           |   |   | A |   |   |
                           +---+---+---+---+---+
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