Postscript Extraction Sample Clauses

Postscript Extraction. ‌ Yang and Fateman [68] present work that enables processing PostScript documents and converting the contained mathematical expressions into Lisp expressions. The processing of the PostScript document was based on a modified version of a PostScript to text converter, which adapted the GhostScript interpreter to output information about words and their bounding boxes. They were particularly concerned with the operators that painted glyphs and lines, changed fonts and translated or scaled the coordinates. When a document had been passed through the interpreter, a series of instructions were output, which were followed to produce a string of characters, along with their font name and bounding box. Whilst this was generally a trivial task, certain characters had to be identified through pattern matching groups of commands. This occurred when glyphs were constructed of multiple commands, common with square roots, integral signs and division lines. As a result the PostScript extractor translates mathematical expressions into corresponding Lisp expressions, which are suitable for further processing. In fact the Lisp expressions can be understood to constitute parse trees in their own right, which could be the basis for translation into other formats. However, there is no evidence that any meaningful further processing or translation has been attempted by the authors. Currently the extractor is no longer readily available for download and use. Moreover, it is outdated in that its implementation relyed heavily on a Lisp engine with some C++ routines. Its reliance on specific pattern matching techniques make its accuracy dependent on the actual mathematical subject area of documents and thus un- suitable for general purpose extraction in a digital mathematics library. More importantly however, while there are still documents available in Postscript format in many digital libraries, Postscript itself is falling into disuse as an archival format. Moreover, modern software makes conversion to PDF not only easy but also lossless in terms of the structure of the content. As a consequence the use and further development of extraction techniques based on the PDF format should be preferred in the context of our project.
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