Aletheia User Guide Version 4.1 Date: November 2019 Copyright © 2019 PRImA Research Lab, University of Salford, UK www.primaresearch.org Contents Glossary ............................................................................................................................................................. 4 System Requirements and Installation .............................................................................................................. 6 About Aletheia ................................................................................................................................................... 8 New in Version 4 ........................................................................................................................................... 8 Using Aletheia .................................................................................................................................................... 9 Toolbars ......................................................................................................................................................... 9 Creating, Opening, Saving, and Exporting Documents ............................................................................... 11 Creating a new Document ...................................................................................................................... 11 Opening an Existing Document ............................................................................................................... 12 Quick Open Function .............................................................................................................................. 13 Saving a Document ................................................................................................................................. 14 Exporting a Document or Parts of a Document ...................................................................................... 14 Viewing Documents .................................................................................................................................... 17 Selecting the Document Image ............................................................................................................... 17 Zooming .................................................................................................................................................. 17 The Hand Tool ......................................................................................................................................... 18 Page Attributes ............................................................................................................................................ 19 Custom Attributes ................................................................................................................................... 19 Image Tools .................................................................................................................................................. 20 Loading and Saving Images ..................................................................................................................... 20 Binarisation ............................................................................................................................................. 21 Noise Removal ........................................................................................................................................ 22 Drawing Tools .......................................................................................................................................... 25 Rotation................................................................................................................................................... 26 Cropping .................................................................................................................................................. 26 Document Bounds (Border and Print Space) .............................................................................................. 27 Marking the Document Border ............................................................................................................... 27 Marking the Print Space.......................................................................................................................... 28 Automated Border Detection ................................................................................................................. 28 Marking Layout Regions .............................................................................................................................. 29 Assisted Region Creation ........................................................................................................................ 29 Defining Region Outlines Manually ........................................................................................................ 34 Correcting Regions .................................................................................................................................. 34 Creating Text Regions from Text Lines (Bottom-up) ................................................................................ 37 Automatic Page Analysis and Text Recognition (OCR) ............................................................................ 38 Marking Text Lines ....................................................................................................................................... 41 Defining Text Lines by Splitting (Top-Down) ........................................................................................... 41 Defining Text Lines using Contour Detection .......................................................................................... 43 Defining Text Lines by Selecting Connected Components ...................................................................... 44 Drawing Text Lines Manually .................................................................................................................. 46 Correcting Text Lines ............................................................................................................................... 46 Creating Text Regions from Text Lines (Bottom-up) ................................................................................ 48 Creating Text Lines from Words (Bottom-up) ......................................................................................... 49 Analysis, Detection and Text Recognition ............................................................................................... 49 Marking Baselines ................................................................................................................................... 53 Text Line Order ........................................................................................................................................ 54 Marking Words ............................................................................................................................................ 58 Defining Words by Splitting (Top-Down) ................................................................................................. 58 Defining Words using Contour Detection ............................................................................................... 59 Defining Words by Selecting Connected Components ........................................................................... 60 Drawing Words Manually ........................................................................................................................ 60 2 Correcting Words .................................................................................................................................... 61 Creating Text Lines from Words (Bottom-up) ......................................................................................... 62 Creating Words from Glyphs (Bottom-up) .............................................................................................. 63 Analysis, Detection and Text Recognition ............................................................................................... 63 Marking Glyphs ........................................................................................................................................... 67 Defining Glyphs by Splitting (Top-Down) ................................................................................................ 67 Defining Glyphs using Contour Detection ............................................................................................... 68 Defining Glyphs by Selecting Connected Components ........................................................................... 69 Drawing Glyphs Manually ....................................................................................................................... 69 Correcting Glyphs .................................................................................................................................... 70 Creating Words from Glyphs (Bottom-up) .............................................................................................. 70 Layout analysis and text recognition via OCR engine ............................................................................. 71 Drawing Tools .............................................................................................................................................. 73 Drawing