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New directional morphological operators that have accurate selectivity and controllable strictness, are defined and applied to dashed lines detection and labeling. The proposed approach is based on adaptation of the directions and dimensions of newly defined tube-directional morphological operators to local characteristics of the data. The separation of maps and line drawings, into four images containing...
Directional morphological operations for separation of characters from maps/graphics have been proposed previously. In this paper we present an approach to improve the efficiency of this algorithm using run-length-encoded (RLE) image representation. Directional edge images are all represented as directional run-length linked lists. Moreover, we migrate all of the processes used to the RLE data structure...
Localization, recognition, and interpretation of graphical objects such as line art, maps and engineering drawings in document images has been a topic of much research attention in recent years. A comprehensive overview of research problems, solution procedures and typical systems for graphics recognition was published in 1990 [KasRam90] and an update was published in 1994 [AriKas94]. In this paper...