AVS2编码标准综述论文
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Siwei Ma, Tiejun Huang, Cliff Reader, and Wen Gao
[
standards
IN A NUTSHELL
]
IEEE SIGNAL PROCESSING MAGAZINE [172] MARCh 2015 1053-5888/15©2015IEEE
VS2 is a new generation of
video coding standard devel-
oped by the IEEE 1857
Working Group under
project 1857.4. AVS2 is
also the second-generation video coding
standard established by the Audio and
Video Coding Standard (AVS) Working
Group of China; the first-generation
AVS1 was developed by the AVS Working
Group and issued as Chinese national
standard GB/T 20090.2-2006 in 2006.
The AVS Working Group was founded in
2002 and is dedicated to providing the
digital audio-video industry with highly
efficient and economical coding/decod-
ing technologies. So far, the AVS1 video
coding standard is widely implemented
in regional broadcasting, communica-
tion, and digital video entertainment sys-
tems. As the successor of AVS1, AVS2 is
designed to achieve significant coding
efficiency improvements relative to the
preceding H.264/MPEG4-AVC and AVS1
standards. The basic coding framework
of AVS2 is similar to the conterminous
HEVC/H.265, but AVS2 can provide more
efficient compression for certain video
applications such as surveillance as well
as low-delay communication such as vid-
eoconferencing. AVS2 is making video
coding smarter by adopting intelligent
coding tools that not only improve cod-
ing efficiency but also help with com-
puter vision tasks such as object
detection and tracking.
BACKGROUND
The AVS Working Group was established
in March 2002 in China. The mandate of
the group is to establish generic techni-
cal standards for the compression,
decoding, processing, and representation
of digital audio-video content, thereby
enabling digital audio-video equipment
and systems with highly efficient and
economical coding/decoding technolo-
gies. After more than a decade, the work-
ing group has published a series of
standards, including AVS1, which is the
culmination of the first stage of work.
Table 1 shows the time line of the AVS1
video coding standard (for short, AVS1). In
AVS1, six profiles were defined to meet the
requirements of various applications. The
Main Profile focuses on digital video
applications like commercial broadcasting
and storage media, including high-defini-
tion video applications. It was approved as
a national standard in China: GB/T
20090.2-2006. It was followed by the
Enhanced Profile, an extension of the
Main Profile with higher coding efficiency,
targeting the needs of multimedia enter-
tainment, such as movie compression for
high-density storage. The Surveillance
Baseline and Surveillance Profiles focus
on video surveillance applications, consid-
ering in particular the characteristics of
surveillance videos, i.e., high noise levels,
relatively low encoding complexity, and
requirements for easy event detection and
search. The Portable Profile targets mobile
video applications with lower resolution,
low computational complexity, and robust
error resiliency to meet the wireless envi-
ronment. The latest Broadcasting Profile
is also an improvement of the Main Profile
and targets high-quality, high-definition
TV (HDTV) broadcasting. It was approved
and published as an industry standard by
the State of China Broadcasting Film and
Television Administration in July 2012.
AVS standards are also being recog-
nized internationally. In 2007, the Main
AVS2—Making Video Coding Smarter
Digital Object Identifier 10.1109/MSP.2014.2371951
Date of publication: 12 February 2015
[TABLE 1] TIME LINE OF AVS1 VIDEO CODING STANDARD.
TIME PROFILE TARGET APPLICATION(s) MAJOR CODING TOOLS
DECEMBER
2003
MAIN TV BROADCASTING 8
#
8 BLOCK-BASED INTRAPREDICTION,
TRANSFORM AND DEBLOCKING FILTER;
VARIABLE BLOCK SIZE MOTION
COMPENSATION (16
#
16
+ 8
#
8)
JUNE 2008 SURVEILLANCE
BASELINE
VIDEO SURVEILLANCE BACKGROUND-PREDICTIVE PICTURE
FOR VIDEO CODING, ADAPTIVE
WEIGHTING QUANTIZATION (AWQ),
CORE FRAME CODING
SEPTEMBER
2008
ENHANCED DIGITAL CINEMA CONTEXT BINARY ARITHMETIC
CODING (CBAC), AWQ
JULY 2009 PORTABLE MOBILE VIDEO COMMUNICATION 8
#
8/4
#
4 BLOCK TRANSFORM
JULY 2011 SURVEILLANCE VIDEO SURVEILLANCE BACKGROUND MODELING BASED
CODING
MAY 2012 BROADCASTING HDTV AWQ, ENHANCED FIELD CODING
A
AVS2 IS MAKING
VIDEO CODING
SMARTER BY ADOPTING
INTELLIGENT CODING
TOOLS THAT NOT ONLY
IMPROVE CODING
EFFICIENCY, BUT ALSO
HELP WITH COMPUTER
VISION TASKS SUCH
AS OBJECT DETECTION
AND TRACKING.
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