\documentclass[8pt]{scrreprt}
\usepackage{fontspec}
\usepackage{xunicode}
\usepackage{polyglossia}
\usepackage[margin=1in, paperwidth=12cm, paperheight=12cm, top=0cm, bottom=0cm, left=0cm, right=0cm]{geometry}

\begin{document}

\begin{titlepage}
    \begin{center}
        \textbf{}
        \vfill

        \begin{figure}[htp]
            \centering
            \includegraphics[width=1\textwidth]{figures/Arduino_Ethernet.jpg}
        \end{figure}

        \vfill
    \end{center}
\end{titlepage}

\end{document}