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\subsection{Vertex}  A region $c_i$ will constitute a vertex $v_i$ in the video graph $G(V,E)$. Then cardinality of $|V|$ is equal to the size of segmented regions, $|C|$. The BoVW histogram $h_i$ of local features $f_i \in c_i$ represent an unary potential for vertex $v_i$.   \subsubsection{Local feature histogram}