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Review the use of transmission losses to network losses

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jfmcarreira
2018-12-15 01:42:24 +00:00
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010_Introduction/Introduction.tex
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@@ -19,7 +19,6 @@ To cope with such demanding requirements a new coding standard was developed by
The \ac{hevc} is currently the main video coding framework to extend current services towards higher resolution formats delivered with better compression efficiency.
Similar to its predecessor, \ac{hevc} is a block-based hybrid video codec using predictive, transform and entropy coding.
The coding flexibility and efficiency of \ac{hevc} results from the use of new coding tools and block structures, which enables new block partitions\cite{HEVCBlock2012}, improved prediction modes \cite{IntraCodingHEVC2012,AMPCodingHEVCJun2012} and new high-level features~\cite{HEVCHighLevelReferenceDez2012}, such as explicit reference picture management and new parameter sets.
%However, it is known that higher coding efficiency leads to lower robustness in the presence of transmission errors and data loss.
However, new coding tools of \ac{hevc} not only bring high compression efficiency~\cite{HEVCComparisonDec2012}, but also some other disadvantages, such as increased complexity~\cite{PerformanceComplexityDez2012} and inherent reduction of error robustness~\cite{StudyHEVCErrorsDez2012}.
Earlier studies about the error robustness characteristics of \ac{hevc} have shown that, in general, the use of high efficiency coding tools results in poor error resilience performance (score \emph{slightly annoying} in the \ac{mos} scale), in comparison with previous standards~\cite{QoEHEVCMay2014,SubjectiveEvalSep2013}.
Thus, when \ac{hevc} streams incur in transmission losses, this leads to significant degradation of both objective and subjective quality.
@@ -51,7 +50,7 @@ The following objectives were pursued in this work:
\begin{enumerate}
\item
\textbf{Study and evaluation of error robustness in highly compressed video:}
The objective of this research study is to evaluate the robustness against transmission errors of highly efficiently coded video.
The objective of this research study is to evaluate the robustness against network losses of highly efficiently coded video.
The study and its conclusions aim at finding relevant research directions to develop new methods for increasing the error robustness of coded streams.
The results and conclusions of this study were published in conference paper (\ref{Conf:ErrorResilience}) and in journal paper (\ref{Journal:TwoStage}) (see Appendix~\ref{Appen:Papers}).