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A thinned or contoured image should be further vectorized; that is, image objects should be represented in vector form by the coordinates of their points (all points or only essential ones) and line segments (or vectors) connecting these points. For contoured images, required points are extracted and approximated during the contouring process. While a thinned image is still in raster form, a special operation to perform vectorization should be applied, during which the extracted thin lines should be approximated and recorded in the vector database. Since there are usually object defects after vectorization, a spe-cial stage devoted to their reduction should be included. All these tasks are considered in this chapter.
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