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jfmcarreira
2018-09-18 00:52:08 +01:00
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021_VideoCoding/VideoCodingReview.tex
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@@ -182,6 +182,11 @@ The \ac{pps} is responsible to carry information that may change for every pictu
\subsection{Picture types}
The \ac{hevc} standard supports several pictures types, as show in Table~\ref{Table2:PictureTypes}, which are classified in the following categories: (i) random-access points, (ii) leading pictures and (iii) temporal sub-layer access pictures~\cite{HEVCHighLevelReferenceDez2012,BookHEVC2014}.
The use of different types of pictures allows the \ac{hevc} stream to be more flexible, support a wider range of applications and achieve robust video communications.
They are important to perform random-access, which is a critical feature for channel switching, seek operations and dynamic streaming services.
Moreover, introducing random-access points into the bitstream increases its error robustness as they provide anchor points for a clean decoding after data loss or synchronisation problems.
\begin{table}[tb]
\centering
\caption{Picture categories in HEVC standard.}\label{Table2:PictureTypes}
@@ -201,14 +206,14 @@ The \ac{pps} is responsible to carry information that may change for every pictu
BLA &
Broken link access &
Leading pictures cannot be decoded \\
\midrule \midrule
\multicolumn{3}{c}{\textbf{Leading pictures}} \\
\midrule
RADL & \multicolumn{2}{l}{Random access decodable picture}\\
\midrule
RASL & \multicolumn{2}{l}{Random access skipped picture}\\
\midrule\midrule
\multicolumn{3}{c}{\textbf{Temporal sub-layer access pictures}} \\
\midrule
@@ -223,12 +228,6 @@ The \ac{pps} is responsible to carry information that may change for every pictu
\end{tabular}
\end{table}
The \ac{hevc} standard supports several pictures types, as show in Table~\ref{Table2:PictureTypes}, which are classified in the following categories: (i) random-access points, (ii) leading pictures and (iii) temporal sub-layer access pictures~\cite{HEVCHighLevelReferenceDez2012,BookHEVC2014}.
The use of different types of pictures allows the \ac{hevc} stream to be more flexible, support a wider range of applications and achieve robust video communications.
They are important to perform random-access, which is a critical feature for channel switching, seek operations and dynamic streaming services.
Moreover, introducing random-access points into the bitstream increases its error robustness as they provide anchor points for a clean decoding after data loss or synchronisation problems.
\subsubsection{Random-Access Point}
The \ac{rap} are pictures used to provide access points in the bitstream with no dependencies, where it is possible to start the decoding process. The standard defines that a conforming bitstream must start with a \ac{rap} picture.