Text/Graphics Separation in Maps
GREC '01 Selected Papers from the Fourth International Workshop on Graphics Recognition Algorithms and Applications
A System to Segment Text and Symbols from Color Maps
Graphics Recognition. Recent Advances and New Opportunities
Query driven word retrieval in graphical documents
DAS '10 Proceedings of the 9th IAPR International Workshop on Document Analysis Systems
Touching text character localization in graphical documents using SIFT
GREC'09 Proceedings of the 8th international conference on Graphics recognition: achievements, challenges, and evolution
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The use of computer aided design requires line drawings and maps to be digitized and stored in databases. The input of line drawings and maps into databases requires vectorization of lines, and recognition of symbols and characters. The paper addresses two aspects related to the input process. The first aspect is an automatic algorithm for the separation of character strings from maps. The second aspect is an algorithm for line thinning. The proposed algorithms are based on directional morphology operations. The character string extraction algorithm is independent of font style, size, and language and is suitable for a variety of map styles with straight or curved lines. The presented experimental results demonstrate very good performance of the algorithms even in cases where the character strings touch or intersect lines in the map.