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Extraction and segmentation of tables from Chinese ink documents based on a matrix model

Extraction and segmentation of tables from Chinese ink documents based on a matrix model. Zhang Xi-Wen CSE, CUHK and HCI Lab., ISCAS 2005.10.24. Outline. 1 Tables in an ink document. 2 A matrix for an ink document. 3 Ink tables are extracted and segmented. 4 Experimental results.

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Extraction and segmentation of tables from Chinese ink documents based on a matrix model

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  1. Extraction and segmentation of tables from Chinese ink documents based on a matrix model Zhang Xi-Wen CSE, CUHK and HCI Lab., ISCAS 2005.10.24

  2. Outline • 1 Tables in an ink document. • 2 A matrix for an ink document. • 3 Ink tables are extracted and segmented. • 4 Experimental results. • 5 Conclusion.

  3. Ink documents • Ink documents are produced by digital ink capturers. • Many objects are contained in an ink document. • There are many components in an ink table.

  4. 1.1 Objects in an ink document • Strokes. • Objects.

  5. Text • Paragraph. • Text-line, Expression. • Character, Word, Symbols.

  6. Graphics • Long. • Parts of tables and flowcharts.

  7. Table • Text (simple). • Graphics. • Bordering lines. • Separating lines.

  8. 1.2 Components in an ink table • Strokes. • Row, Column. • Header. • Cell. • Sub-header. • Caption. • Lines.

  9. 1.3 Our approach • Previous approaches. • A matrix model.

  10. 2 A matrix for a ink document • Components in an ink document are extracted. • An ink document can be modeled be a matrix.

  11. 2.1 Ink components • An ink character. • An ink line. • An ink row.

  12. 2.2 Extract components in an ink document • Ink characters. • Ink lines. • Ink rows.

  13. 2.2 A matrix model • Multiple levels. • Context.

  14. 3 Ink tables are extracted and segmented • Extraction. • Segmentation.

  15. 3.1 Table extraction • An identical distribution of writing lines. • The same drawing rows (if available) associated.

  16. A seed-table. • The same distribution. • The seed-table grows.

  17. 3.2 Table segmentation • Rows. • Columns. • Headers. • Cells.

  18. An segmented ink table is modified and recognized.

  19. 4 Experimental results and performance analyses

  20. 4.1 Experimental results

  21. 4.2 performance analyses • Strokes, captions, headers, cells, rows, and columns. • The precision rateand the recall rate.

  22. 4.3 performance comparison • Quality. • Quantity.

  23. Quality comparison

  24. 5 Conclusion • A matrix model for extracting and segmenting ink tables. • More ink tables can be processed. • Extracted ink tables are decomposed.

  25. Thank you very much for your criticism, comments and suggestions! • Email: xwzhang@cse.cuhk.edu.hk • Tel: 3163-4260

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