\documentclass[a4paper]{book}
\usepackage[absolute]{textpos}
\usepackage[demo]{graphicx}
\begin{document}
hello
\newpage
\thispagestyle{empty}
\begin{textblock*}{\paperwidth}(0mm,0mm)
\noindent\includegraphics[width=\paperwidth,height=\paperheight]{myfig}
\end{textblock*}
\mbox{}
\newpage
hello
\end{document}