\documentclass{book}
\usepackage{xepersian}
\settextfont[Scale=1]{B Mitra}
\setdigitfont{Calibri}
\setlatintextfont[Scale=1]{Times New Roman}
\begin{document}
\begin{figure}
\includegraphics[scale= 0.8]{figs/bcdl2.png}
\caption{}
\label{fig:f12}
\end{figure}
\end{document}