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BL Demo Day - July2011 - (4) OCR for IMPACT Part 1

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Clemens Neudecker's presentation describing how IMPACT has improved the quality of OCR in conjunction with ABBYY FineReader Engine.

Delivered at the IMPACT BL Demo Day on the 12th of July 2011.

Publié dans : Technologie
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BL Demo Day - July2011 - (4) OCR for IMPACT Part 1

  1. 1. IMPACT OCR in a nutshell Clemens Neudecker, National Library of the Netherlands IMPACT Demo Day, British Library 12/11/11
  2. 2. OCR Process <ul><li>Binarisation </li></ul><ul><li>= transform greyscale or colour images to bitonal (b/w) </li></ul><ul><li>in order to separate foreground (text) from background </li></ul><ul><li>Segmentation </li></ul><ul><li>= detection of layout elements in hierarchical order </li></ul><ul><li>(blocks/regions, lines, words, glyphs) </li></ul><ul><li>Pattern Matching (Recognition) </li></ul><ul><li>= matching of character shapes with internal font database (classifiers) </li></ul>
  3. 3. ABBYY FineReader <ul><li>Main OCR technology provider in IMPACT </li></ul><ul><li>OCR technologies experts since 30 years </li></ul><ul><li>IMPACT uses FineReader Engine (SDK) </li></ul>
  4. 4. Binarisation
  5. 5. Adaptive Binarisation Original scan Prev. binarization New binarization
  6. 6. IMPACT Binarisation <ul><li>Original </li></ul><ul><li>State of the Art </li></ul><ul><li>IMPACT </li></ul>
  7. 7. Segmentation Blocks/Regions Words Glyphs
  8. 8. IMPACT Segmentation example Pre-Impact FR Engine 9 FR Engine 10 Part of column was misclassified as image
  9. 9. IMPACT Segmentation example v. 9 v. 10 Linear word order errors
  10. 10. IMPACT Segmentation example v. 9 v. 10 Lost text
  11. 11. Recognition
  12. 12. Languages and Dictionaries <ul><li>Goal: </li></ul><ul><ul><li>Develop an interface so that external dictionaries can be integrated into the FineReader Engine </li></ul></ul><ul><li>2008 - 2009: </li></ul><ul><ul><li>External Dictionary beta interface </li></ul></ul><ul><ul><li>Same quality as with internal dictionaries possible </li></ul></ul><ul><li>2010 - 2011: </li></ul><ul><ul><li>Make interface work reliably </li></ul></ul><ul><ul><li>Teach partners how to use it </li></ul></ul><ul><ul><li>Support for any language, any time period </li></ul></ul>
  13. 13. ALTO: New native export format <ul><li>Available since FRE 10 R2 </li></ul><ul><li>Supports most recent schema: ALTO v. 2.0 </li></ul><ul><li>Line coordinates available </li></ul>
  14. 14. Thank you! Questions?

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