Abstract
In this paper, a new method of the group direction difference chain code representation is presented which can be used to represent the curves or shape borders, and also can be used for the features extraction of shape borders. The idea of this method is to construct a chain codes based on the Freeman chain codes whose values represent the average changes in direction along the boundary of an any shape. For the sake of overcoming the noise in Freeman chain codes, in this paper the concept of direction smoothing is proposed, and a transform from Freeman chain codes to the direction smoothing chain codes is developed. Finally, the method and algorithm for obtaining the group direction difference chain codes are presented.
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