Intra-Picture Prediction in HEVC - High Efficiency Video Coding (HEVC) - page 91

Chapter 4
Intra-Picture Prediction in HEVC

Jani Lainema and Woo-Jin Han

Abstract The intra prediction framework of HEVC consists of three steps: ref-
erence sample array construction, sample prediction, and post-processing. All the
three steps have been designed to achieve high coding efficiency while minimizing
the computational requirements in both the encoder and decoder. The set of defined
prediction modes consists of methods modeling various types of content typically
present in video and still images. The HEVC angular prediction provides high-
fidelity predictors for objects with directional structures, and the additional planar
and DC prediction modes can effectively model smooth image areas.

4.1 Introduction

The HEVC intra prediction methods can be classified in two categories. Angular
prediction methods [ 17 ] form the first category and provide the codec with a
possibility to accurately model structures with directional edges. The methods
in the second category, namely planar prediction [ 7 ] and DC prediction, provide
predictors estimating smooth image content. The total number of intra prediction
modes supported by HEVC is 35 as listed in Table 4.1 .
All the HEVC intra prediction modes use reference samples from the adjacent
reconstructed blocks as illustrated in Fig. 4.1 . As the reconstruction is performed
at transform block granularity, also the intra prediction is operated at the selected
transform block size ranging from 4 4to32 32 samples. HEVC allows usage

J. Lainema ( )
Nokia Research Center, Tampere, Finland
e-mail: [e-mail]
W. -J. Han
Gachon University, Seongnam-si, Gyeonggi-do, Korea
e-mail: [e-mail]