Finding Captions in PDF-Documents for Semantic Annotations of Images

  • Gerd Maderlechner
  • Jiri Panyr
  • Peter Suda
Part of the Lecture Notes in Computer Science book series (LNCS, volume 4109)


The Portable Document Format (PDF) is widely-used in the Web and searchable by search engines, but only for the text content. The goal of this work is the extraction and annotation of images in PDF-documents, to make them searchable and to perform semantic image annotation. The first step is the extraction and conversion of the images into a standard format like jpeg, and the recognition of corresponding image captions using the layout structure and geometric relationships. The second step uses linguistic-semantic analysis of the image caption text in the context of the document domain. The result on a PDF-document collection with about 3300 pages with 6500 images has a precision of 95.5% and a recall of 88.8% for the correct image captions.


Text Line Semantic Annotation Text Block Portable Document Format Layout Analysis 


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Copyright information

© Springer-Verlag Berlin Heidelberg 2006

Authors and Affiliations

  • Gerd Maderlechner
    • 1
  • Jiri Panyr
    • 1
  • Peter Suda
    • 1
  1. 1.Corporate TechnologySiemens AGMünchenGermany

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