Object-level document analysis of PDF files

13 years 11 months ago

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The PDF format is commonly used for the exchange of documents on the Web and there is a growing need to understand and extract or repurpose data held in PDF documents. Many systems for processing PDF ﬁles use algorithms designed for scanned documents, which analyse a page based on its bitmap representation. We believe this approach to be ineﬃcient. Not only does the rasterization step cost processing time, but information is also lost and errors can be introduced. Inspired primarily by the need to facilitate machine extraction of data from PDF documents, we have developed methods to extract textual and graphic content directly from the PDF content stream and represent it as a list of“objects” at a level of granularity suitable for structural understanding of the document. These objects are then grouped into lines, paragraphs and higher-level logical structures using a novel bottom-up segmentation algorithm based on visual perception principles. Experimental results demonstrate...

Tamir Hassan

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