\documentclass[12pt,a4paper]{article}

\usepackage[final]{graphicx}
\usepackage{subfig}
\usepackage{hyperref}

\begin{document}

\section{Introduction}
Start test

\begin{figure}
  \centering
  \subfloat{%
  \includegraphics{foo}} \quad
  \subfloat{%
  \label{foo}
  \includegraphics{foo}}
\end{figure}

end test

\end{document}
