Anatomy of a Page Reader
نویسنده
چکیده
An experimental machine vision system that reads pages of printed text is described, with particular attention to features which permit it to cope with a variety of languages. We have attempted to uncouple sources of variation in the input irnaging defects, page layouts, sizes of text, symbol sets, font styles, linguistic contexts, and transliteration encodings so that each can be managed by an independent subsystem. In pursuit of this goal, new algorithms have been required. For example. page layout analysis is virtually language-independent due to the use of a global-to-local strategy; but this demanded unusually fast and accurate algorithms for skewand shear-correction and for analysis of the structure of white space. To permit arbitrary combinations of symbol sets, font styles, and image defect distributions for specialized classifiers, we developed a hybrid structuraVstatistica1 recognition technology, trained by examples generated by a pseudo-random image defect model. Character segmentation is driven by classifier confidence scores, with the result that language-specific rules are rarely needed. Linguistic context, such as provided by dictionaries, is exploited by a series of data-directed filtering algorithms in a uniform and modular manner.
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تاریخ انتشار 1990