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IMPACT Final conference - USAL - Arbitrary warping
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IMPACT ResearchImage Enhancement,Segmentation,Experimental OCR
Apostolos Antonacopoulos
PRImA Lab, The University of Salford, United Kingdomwww.primaresearch.org
Outline Overview: digitisation workflow Image enhancement
Border removal Page curl removal Correction of arbitrary warping
Segmentation Recognition-based Standalone
Typewritten document OCR Wordspotting
2
Overview: Digitisation Workflow
3
Main steps:① Scanning② Image enhancement
Page splitting Border removal Page curl removal Dewarping
③ Layout analysis Segmentation of regions, lines, words and
characters Region classification Logical layout analysis
④ OCR (incl. specialist or wordspotting)⑤ Post-processing
Correction of Arbitrary Warping Fully-automated tool for large-scale
digitisation Interface for interactive fine correction
(e.g. for boutique digitisation projects) Arbitrary geometric artefacts correction Multi-column documents Fully-parameterised process (reversible) No adverse effects on non-warped
documents22 March 2011 – EC review4
Fully-Automated Dewarping
22 March 2011 – EC review5
Global Grid Construction
22 March 2011 – EC review6
Original Image Region Segmentation Global Grid
Sub-Grid Correction
22 March 2011 – EC review7
Sub-grid text lines
Sub-grid aligned to baselines
Corrected sub-grid
Multi-Column Document Correction
Original image Baseline-aligned sub-grids Corrected image
Preliminary Results Evaluation
calculates deviation from straight lines (shaded area)
Method compared with IMPACT page-curl removal method and with original image
22 March 2011 – EC review9
Further Information10
PRImAhttp://www.primaresearch.org
IMPACThttp://www.impact-project.eu