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\subsubsection{Local feature histogram}  Each node $v_i$ will be associated with two histograms: \textit{foreground histogram} $h_i^{fg}$ and background histogram $h_i^{bg}$ \textit{background histogram} $h_i^{bg}$:  \begin{itemize}  \item $h_i^fg = \sum_{f_j \in c_i} $  \end{itemize}