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031_ErrorResilienceEvaluation/ErrorResilienceEvaluation.tex

@@ -41,7 +41,7 @@ Between them, an inter-layer signalling ensures that the decoder is given the ne
 
 The are some studies presented in the past regarding the error robustness of the \ac{hevc} standard which are worth to be mention as they provide relevant insights for the research of carried out in this research work. In~\cite{StudyHEVCErrorsDez2012} the both the coding efficiency and error robustness of the \ac{hevc} are evaluated, and compared against the \ac{h264}. Experimental results show that \ac{hevc} has reduced error robustness despite its increased coding efficiency. A subjective analysis is presented in~\cite{SubjectiveEvalSep2013,QoEHEVCMay2014} revealing that packet loss ratios higher than $3\%$ have a significant effect on the perceived video quality. In both works it is concluded that the robustness of \ac{hevc} decreases for high motion sequences. Moreover, in~\cite{DynamicTMVP2011} a the vulnerability of \ac{mv} prediction is presented and its impact of the error robustness is evaluated, showing its weak error resilience in contrast with the coding improvements. Summarising, the decreasing in error robustness is mostly due to the strong decoding dependencies imposed by the highly complex prediction modes of \ac{hevc}, which are selected according to a rate distortion optimisation criteria, assuming error-free transmission\cite{ROPE2007}.
 
-This section presents an error robustness evaluation of the \ac{hevc} standard. This study focus on the novel techniques introduced extending the generic studies presented in previous works mentioned above. This study may provide relevant insights for future directions where the error robustness problem should be tackled in the \ac{hevc} standard. 
+This section presents an error robustness evaluation of the \ac{hevc} standard. This study focus on the novel techniques introduced extending the generic studies presented in previous works mentioned above. This study may provide relevant insights for future directions where the error robustness problem should be tackled in the \ac{hevc} standard.
 The following cases studies are covered in this experimental evaluation:
 \begin{enumerate}
  \item different maximum \ac{cu} sizes to evaluate the impact of higher larger frame partitioning;
@@ -156,7 +156,7 @@ Results on Figure~\ref{Figure3:QualityvsIntra} shows the average decoded video q
 
 
 
-One should also be noted from the results of Figure~\ref{Figure3:QualityvsIntra} that using a small distance between intra frames is not always more efficient. Since intra frames require higher amount of bytes, the overall coding efficiency is reduced, resulting in an overall quality decreasing even with a 5\% f \ac{plr}. This is clear noticeable for the Four People sequence. From the results for Park Scene sequence (and Cactus sequence in Figure~\ref{Appendix:Figure3:QualityvsIntra}) it can be concluded that using sixteen frames between refresh points (i.e., intra frames) achieves an acceptable efficiency under errors, without compromising the coding efficiency.
+One should also be noted from the results of Figure~\ref{Figure3:QualityvsIntra} that using a small distance between intra frames is not always more efficient. Since intra frames require higher amount of bytes, the overall coding efficiency is reduced, resulting in an overall quality decreasing even with a 5\% f \ac{plr}. This is clear noticeable for the Four People sequence. From the results for Park Scene and Cactus sequences it can be concluded that using sixteen frames between refresh points (i.e., intra frames) achieves an acceptable efficiency under errors, without compromising the coding efficiency.
 
 \subsection{Evaluation for using different slice partitioning schemes}