Graphics Reference
In-Depth Information
Chapter 5
Inter-Picture Prediction in HEVC
Benjamin Bross, Philipp Helle, Haricharan Lakshman, and Kemal Ugur
Abstract
Inter-picture prediction in HEVC can be seen as a steady improvement
and generalization of all parts known from previous video coding standards, e.g.
H.264/AVC. The motion vector prediction was enhanced with advanced motion
vector prediction based on motion vector competition. An inter-prediction block
merging technique significantly simplified the block-wise motion data signaling
by inferring all motion data from already decoded blocks. When it comes to
interpolation of fractional reference picture samples, high precision interpolation
filter kernels with extended support, i.e. 7/8-tap filter kernels for luma and 4-tap filter
kernels for chroma, improve the filtering especially in the high frequency range.
Finally, the weighted prediction signaling was simplified by either applying explic-
itly signaled weights for each motion compensated prediction or just averaging two
motion compensated predictions. This chapter provides a detailed description of
these aspects of HEVC standard and explains their coding efficiency and complexity
characteristics.
5.1
Introduction
In HEVC, the same basic hybrid video coding approach as in previous standards
is applied. Hybrid video coding is known to be a combination of video sample
prediction and transformation of the prediction error, i.e. the residual, followed
by entropy coding of the prediction information and the transform coefficients.
B. Bross (
) P. Helle H. Lakshman
Fraunhofer Institute for Telecommunications - Heinrich Hertz Institute,
Einsteinufer 37, D-10587 Berlin, Germany
e-mail:
benjamin.bross@hhi.fraunhofer.de
K. Ugur
Nokia Corporation, Tampere 33720, Finland
e-mail:
Kemal.Ugur@nokia.com
