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2019 IEEE International Conference on Multimedia and Expo (ICME)

FAST CU PARTITIONING ALGORITHM FOR H.266/VVC INTRA-FRAME CODING

Ting Fu, Hao Zhang, Fan Mu Huanbang Chen

Central South University, Changsha, PRC Huawei Base, Longgang, Shenzhen, PRC

ABSTRACT

Recently, the Joint Video Exploration Team (JVET) has es

tablished the latest video coding standard, Versatile Video

Coding (H.266/VVC). The H.266/VVC adopts the quadtree

with nested multi-type tree coding block structure which

brings huge computational burden that limits the developmen

t, adoption and application of the future video coding stan

dard. To encounter this problem, we propose a novel fast

block partition algorithm through Bayesian decision rule. The

proposed method fully explored the information of the hori

zontal binary splitting which is newly introduced because of

the adoption of the novel coding block structure. Experimen

tal results demonstrate that the proposed algorithm achieves

about 45% encoding time saving on average with negligible

quality loss under all-intra configuration.

Index Terms— Block partition, Versatile Video Coding

(VVC), fast intra coding

1. INTRODUCTION

Contemporarily, the increasingly prevalent application of

high-quality and high-resolution video is creating an urgen

t demand for next-generation video coding technologies be

yond the High Efficiency Video Coding (HEVC) standard [1].

To address this issue, Moving Picture Experts Group (MPEG)

and Video Coding Experts Group (VCEG) have jointly es

tablished the Joint Video Exploration Team (JVET) and have

made significant progress recently. Plenty of novel techniques

have been adopted and implemented in the the H.266/VVC

Test Model (VTM) [2], which has greatly improved the cod

ing efficiency on the basis of HE VC. For the block partition

ing structure, the H.266/VVC adopts the quadtree with nested

multi-type tree coding block structure (QTMT) [3]. More

over, in H.266/VVC, the coding tree scheme supports the a

bility for the luma and chroma to have a separate block tree

structure in I-slice. For the intra prediction, there are over

all 67 directional intra modes as shown in Figure 1, where

the 32 additional directional modes are extended from HEVC

denoted by red dotted arrows, and the planar and DC modes

are unchanged from HEVC. Indexes of all the modes are list

ed in Fig.l, where red numbers denote the additional intra

modes and black numbers denote the original intra modes

Corresponding author: hao@csu.edu.cn (Hao Zhang)

DOI 10.1109/ICME.2019.00018

Fig. 1: Intra prediction modes in H.266/VVC

in HEVC. To improve the efficiency of the intra coding, ad

ditional tools are introduced, e.g. Position-Dependent Intra

Prediction Combination (PDPC)[4] and Multiple transform s

election (MTS) [5]. The PDPC employs a weighted combi

nation of unfiltered boundary reference samples and the pre

dicted samples. PDPC is applied to the certain intra modes

without signalling, e.g. planar, DC, horizontal and vertical

intra modes. Besides, the MTS is introduced to improve

the transform efficiency for intra and inter coding. Differ

ent from HEVC, where only DCT-II and 4x4 DST-VII are

employed, H.266/VVC uses MTS to supplement the transfor

m cores with the DST-VII and DCT-VIII. The MTS uses the

number of non-zero coefficients to select kernels adaptively

in intra mode. If the number of nonzero coefficients is less

than two, DST-VII is used both horizontally and vertically.

Otherwise, DST-VII and DCT-VIII are evaluated through RD

checking to apply transform.

In conclusion, the quadtree with nested multi-type tree

partitioning structure, the separate splitting process for the

luma and chroma components, the extended intra prediction

modes along with the newly added transform cores have im

proved the intra coding efficiency significantly whereas cre

ating a huge computational burden to the emerging codec.

Thus, there is an urgent need to reduce the encoding complex

ity to facilitate the development, adoption and application of

the H.266/VVC.

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