keegan_csmith / watercomp

A compression algorithm targeting molecular dynamics simulations with large amounts of water.

commit 376: 6d55976768a6
parent 375: b64b5a2e8fe3
branch: default
Added some stats results for quantisation
Min-Young Wu / min
4 months ago

Changed (Δ18.3 KB):

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Up to file-list docs/presentation/presentation.tex:

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\section{Visualisations and Quantisation}
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\begin{frame}{Quantisation}
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% {{{
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To aid compression, the floating point data is first converted to integer values.
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\begin{figure}
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  \centering
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  \includegraphics[width=75mm]{min-images/quantisation.png}
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  \caption{Quantising point data can be seen as snapping points to a grid.}
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\end{figure}
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\end{frame}
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% }}}
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\begin{frame}{Visualisations}
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% {{{
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To examine the simulations, a number of visualisations were developed:
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\begin{enumerate}
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  \item Water Point
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\end{frame}
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% }}}
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\begin{frame}{Quantisation}
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% {{{
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To aid compression, the floating point data is first converted to integer values.
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\begin{figure}
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  \centering
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  \includegraphics[width=75mm]{min-images/quantisation.png}
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  \caption{Quantising point data can be seen as snapping points to a grid.}
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\end{figure}
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\end{frame}
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% }}}
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\begin{frame}{Quantisation Experiment}
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% {{{
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  \item Quantisation causes a loss in data.
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  \item Researchers will be visually examining the simulations, how much error is noticeable?
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  \item A quantisation experiment was conducted to measure the perceptually visible effects of quantisation.
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  \item The experiment helps determine an appropriate level of quantisation, tradeoff between compression ratio and discarded data.
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  \item Determine an appropriate level of quantisation, tradeoff between compression ratio and discarded data. \\ \
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  \item What is the level of quantisation where the perceived differences between the original and quantised data are not significantly different.
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\end{frame}
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% }}}
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\begin{frame}{Analysis of Quantisation Results}
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% {{{
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\begin{itemize}
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  \item The datasets do \textbf{not} have a statistically significant effect \\
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  {\footnotesize Which is \textbf{good}, all datasets were similary affected by quantisation.
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  Friedman Test \textbf{p-value: $>$0.1}}
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  % \item The data is normal \\
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  % {\footnotesize Shapiro-Wilks Test \textbf{p-value: $<$0.01}}
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  \item Quantisation has a statistically significant effect \\
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  {\footnotesize ANOVA \textbf{p-value: $<$2.2e-16}}
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  \item 8 and 10 bit quantisation are not statistically significantly different
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  from each other \\
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  {\footnotesize Ball-and-stick: \textbf{p-value of 0.7135299}} \\
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  {\footnotesize Metaballs: \textbf{p-value of 0.9762546}}
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\end{itemize}
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\end{frame}
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% }}}
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\begin{frame}{Quantisation Results}
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% {{{
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\begin{figure}
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  \centering
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  \includegraphics[width=100mm]{min-images/bm-boxplot.png}
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  \caption{Box-and-whisker plot showing the ratings for each of the quantisation levels and visualisations.}
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\end{figure}
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\end{frame}
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% }}}
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\begin{frame}{Quantisation Results}
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% {{{
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\begin{figure}
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\end{frame}
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% }}}
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\begin{frame}{Quantisation Results}
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% {{{
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\begin{itemize}
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  \item 4 bit quantisation was rated significantly different.
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  \item 6 bit quantisation was rated moderately different.
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  \item 8 and 10 bit quantisation were rated not significantly different.
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\end{itemize}
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\end{frame}
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% }}}
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% {{{
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\section{Intraframe}