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Each node $v_i$ will be associated with two histograms: \textit{foreground histogram} $h_i^{fg}$ and \textit{background histogram} $h_i^{bg}$:  \begin{itemize}  \item $h_i^fg $h_i^{fg}  = \sum_{j \in c_i} bow(f_j)$ - a frequency of quantized local features $f_j$ extracted inside the region $c_i$. \item $h_i^fg $h_i^{fg}  = \sum_{j \notin c_i} bow(f_j)$ - a frequency of quantized local features $f_j$ extracted outside the region $c_i$. \end{itemize}