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From Paper to Office Document Standard Representation
July 1992 (vol. 25 no. 7)
pp. 63-67

The principles of the model-based document analysis system called Pi ODA (paper interface to office document architecture), which was developed as a prototype for the analysis of single-sided business letters in German, are presented. Initially, Pi ODA extracts a part-of hierarchy of nested layout objects such as text-blocks, lines, and words based on their presentation on the page. Subsequently, in a step called logical labeling, the layout objects and their compositions are geometrically analyzed to identify corresponding logical objects that can be related to a human perceptible meaning, such as sender, recipient, and date in a letter. A context-sensitive text recognition for logical objects is then applied using logical vocabularies and syntactic knowledge. As a result, Pi ODA produces a document representation that conforms to the ODA international standard.

Andreas Dengel, Rainer Bleisinger, Rainer Hoch, Frank Fein, Frank Hönes, "From Paper to Office Document Standard Representation," Computer, vol. 25, no. 7, pp. 63-67, July 1992, doi:10.1109/2.144442
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