1. ExpressReader Pro adopted to retrodigitization of mathematical documents Kazuaki Yokota

2. ExpressReader Pro ■Printed Text OCR ■Japanese / English ■Recognition Rate 99.7% for Japanese 99.8% for English ■Powerful Layout Analysis ■for x86 based Windows PC Features

3. Layout analysis 1

4. Layout analysis 2

5. Adoption for mathematical document ■Application framework ■Detection and recognition of mathematical formula ■Output format Problems

6. Flow diagram Image scanning Skew correction Layout analysis Character recognition User modification Output conversion Formula recognition Formula detection

7. Component relation Scanning Graphical User Interface INFTY formula Recognition Layout analysis Character recognition Formula detection

8. Formula detection 1 ■Score each words for both mathematical formula and text word, obtained by character recognition. M 0 90 100 100 0 90 70 90 T 100 40 20 20 100 40 70 90

9. Formula detection 2 ■Parse by context-free grammar(CFG) - Formula is also non-terminal symbol of this CFG.

11. XML based processing ■Input Recognition parameter, Image ■While processing Layout information, etc ■Output Result OCR needs various data while processing To implement OCR to certain application system, user must program to treat these data. ----- Unify to XML

12. XML Based Processing Layout analysis Character recognition Formula detection Graphical User Interface XML

13. Advantage of XML ■Easy to convert to other formats (XSLT) ■Easy to treat (DOM/SAX) ■Extensible / Flexible ■MathML ■Platform independent

14. XML format 1 ……Recognition Parameters ….. Recognized Results(After Recognition)

15. XML format 2 g ……

16. XML format 3 g ….Mathematical formulae

17. Demonstration ■….

18. Product form ■Software Development Kit ■Simple OCR Software For x86 based Windows PC

19. Summary ■More convenient GUI is needed ■We wish our product will make your business to be more efficient....