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\section{Part Detectors}  Calculating the HOG features requires a series of steps, shown summarized  in Fig. \ref{HOG_Overview}. At each step, Dalal and Triggs \cite{Dalal_2005}  experimentally show that certain choices produce better results than others, and  they call the resultant procedure \emph{the default detector} (HOG-dd).  Like other recent implementations \cite{dpm-pami}, \cite{Felzenszwalb_2010},  we largely operate the same choices, but also introduce some tweaks.