keegan_csmith / watercomp
A compression algorithm targeting molecular dynamics simulations with large amounts of water.
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Added some stats results for quantisation
Min-Young Wu /
min
4 months ago
4 months ago
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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 |
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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} |
