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1st Step : Pixel labelling

 The first labelling consists in giving to each road pixel of the image a label corresponding to a segment of the map. Indeed, the roads in the image consist of pixels whereas roads are defined by segments on the map (generalised representation of the ground truth).

  -> matching 0D-1D

Two methods are possible:

faster one:  a pixel is matched to the closest map segment.

slower one:  Markov model

                -> more homogeneous labelling

Christine Hivernat & Xavier Descombes

November 1998