In this paper, an enhanced active contour, namely active grid, is proposed and its application in extracting
boundaries from targets which have adjacency topology, such as buildings, fields, road and river etc, is further introduced
in more details. In fact, boundaries extraction by general active contour may be regarded as one kind of simplified active
grid, which contains only single region. The basic principle of active grid is: an initial grid given by either manual or
automatic methods in order to provide the correct topological structure and a starting grid. Then, based on an iterative
algorithm, this grid can evolve according to the information of local image. Nodes (or boundaries) of grid are driven by
forces of statistics from different grid region in target image. The evolvement of active grid can be represented by an
energy function, as a result, the extreme value of energy is corresponding to the correct extraction of target. The
experiment results indicate that the active grid is very effective in target extraction from imagery.
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