创建子图

\usepackage{subfigure}
...
\begin{figure}[htbp]
\begin{center}
  \subfigure[Original image]{\label{fig:edge-a}\includegraphics[scale=0.75]{toucan.eps}}
  \subfigure[After Laplace edge detection]{\label{fig:edge-b}\includegraphics[scale=0.75]{laplace_toucan.eps}} \\
  \subfigure[After Sobel edge detection]{\label{fig:edge-c}\includegraphics[scale=0.75]{sobel_toucan.eps}}
\end{center}
\caption{Various edge detection algorithms}
\label{fig:edge}
\end{figure}