\subsection{Preprocessing Algorithms}
\begin{frame}{Preprocessing Algorithms}
\begin{columns}[T]
\begin{column}[T]{5cm}
\begin{itemize}
\item<1-> Normalizing
\begin{itemize}
\item<2-> Scaling
\item<2-> Shifting
\item<3-> Resampling
\end{itemize}
\item<1-> Noise reduction
\begin{itemize}
\item<4-> Smoothing (e.g. moving average)
\item<5-> Dot reduction
\item<6-> Filtering (by distance, speed or angle)
\item<8-> Stroke connection
\end{itemize}
\end{itemize}
\end{column}
\begin{column}[T]{6cm}
\only<2>{\includegraphics[width=6cm, keepaspectratio]{scale-and-shift.png}}
\only<3>{\includegraphics[width=6cm, keepaspectratio]{resampling.png}}
\only<4>{\includegraphics[width=6cm, keepaspectratio]{smooth-1-1-1.png}}
\only<5>{\includegraphics[width=6cm, keepaspectratio]{dot-reduction.png}}
\only<6>{\includegraphics[width=6cm, keepaspectratio]{wildpoint-1.png}}
\only<7>{\includegraphics[width=6cm, keepaspectratio]{wildpoint-2.png}}
\only<8>{\includegraphics[width=6cm, keepaspectratio]{interrupted-stroke.png}}
\end{column}
\end{columns}
\end{frame}