Graphics Reference
In-Depth Information
H.265/High Efficiency Video Coding (HEVC) is the latest video coding technology stand-
ardized by the ISO/IEC Moving Picture Experts Group and the ITU-T Video Coding Ex-
pertsGroup[114].ThisisprimarilybasedonprinciplesofpreviousH.264/AVCvideocod-
ing standard [32]. However, HEVC provides much improved compressionefficiency com-
paredtoH.264/AVCwithaddedfunctionality[32].Figure3.1showsthebasicstructureofa
H.264/AVC coder. Similar to the most of the hybrid-video coders, this structure eliminates
temporalandspatialredundanciesthroughmotioncompensationandDCTbasedtransform
coding approaches respectively. The high compression efficiency and the network friend-
liness for interactive and non-interactive video applications are the main achievements
in this latest standard
[33][34].
The some of the coding features which assist H.264/AVC
to gain superior video quality are variable block-size motion compensation with small
block sizes, quarter-sample-accurate motion compensation, multiple reference picture mo-
tion compensation and in-the-loop de-blocking filter. H.264/AVC consists of two con-
ceptual layers called Video Coding Layer (VCL) and Network Adaptation Layer (NAL).
NALrendersanetworkadaptivebit-streamusingthecodedbit-streamavailable at the VCL
interface(seeFigure3.2).ThiscloseintegrationoftwolayersallowsH.264/AVCtobeused
in low bitrate video communication applications across heterogeneous networks.
Figure 3.2:
H.264/AVCinatransportenvironment
[35]
