In this paper, a novel approach is proposed for selecting the thresholds of edge strength maps from its local histogram. This threshold selection technique is based on finding the threshold for small blocks of the edge map. For each block the threshold is chosen using an iterative procedure. The effect of the choice of the size of the block will be discussed.In this paper, the edge strength map is quantised to reduce the computation of the iterative threshold selection algorithm as well as the memory requirement. It will be shown that the quantisation of the edge map improves the performance of the local iterative threshold selection algorithm. Typical examples of the tests carried out will be presented.
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