Million Book Project Bibliotheca Alexandrina Youssef Eldakar 19

Million Book Project @ Bibliotheca Alexandrina Youssef Eldakar 19 November 2006 Bibliotheca Alexandrina

BA Digitization Workflow Bibliotheca Alexandrina 2

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Image Processing Image to Better Image Bibliotheca Alexandrina

Image Processing Sequence Scan. Fix (Automated processing) Adobe Photoshop (Manual processing) Scan. Fix § Deskew § Despeckle § Rotation § Noise Removal § Black Edge Removal § Page resize § Center Text to page § Enhance text quality [Grow & Erode] § Renaming Files § File compression (CCITT – Group 4) (Automated processing) ACDSee (Automated processing) Bibliotheca Alexandrina 5

Image Processing Sequence Scan. Fix (Automated processing) Adobe Photoshop (Manual processing) Scan. Fix § Deskew § Despeckle § Rotation § Noise Removal § Black Edge Removal § Page resize § Center Text to page § Enhance text quality [Grow & Erode] § Renaming Files § File compression (CCITT – Group 4) (Automated processing) ACDSee (Automated processing) Bibliotheca Alexandrina 6

Scanfix § Deskew After Before Bibliotheca Alexandrina 7

Scanfix § Despeckle Before Bibliotheca Alexandrina After 8

Scanfix § Rotation Bibliotheca Alexandrina 9

Image Processing Sequence Scan. Fix (Automated processing) Adobe Photoshop (Manual processing) Scan. Fix § Deskew § Despeckle § Rotation § Noise Removal § Black Edge Removal § Page resize § Center Text to page § Enhance text quality [Grow & Erode] § Renaming Files § File compression (CCITT – Group 4) (Automated processing) ACDSee (Automated processing) Bibliotheca Alexandrina 10

Photoshop § Noise removal After Before Bibliotheca Alexandrina 11

Photoshop § Black edge removal After Before Bibliotheca Alexandrina 12

Photoshop § Page resize Bibliotheca Alexandrina 13

Photoshop § Center text to page After Before Bibliotheca Alexandrina 14

Image Processing Sequence Scan. Fix (Automated processing) Adobe Photoshop (Manual processing) Scan. Fix § Deskew § Despeckle § Rotation § Noise Removal § Black Edge Removal § Page resize § Center Text to page § Enhance text quality [Grow & Erode] § Renaming Files § File compression (CCITT – Group 4) (Automated processing) ACDSee (Automated processing) Bibliotheca Alexandrina 15

Scanfix § Enhance text quality : Grow, Erode (Horizontal / Vertical) Before Bibliotheca Alexandrina After 16

Image Processing Sequence Scan. Fix (Automated processing) Adobe Photoshop (Manual processing) Scan. Fix § Deskew § Despeckle § Rotation § Noise Removal § Black Edge Removal § Page resize § Center Text to page § Enhance text quality [Grow & Erode] § Renaming Files § File compression (CCITT – Group 4) (Automated processing) ACDSee (Automated processing) Bibliotheca Alexandrina 17

ACDSee § Renaming Files Bibliotheca Alexandrina 18

ACDSee § Compression to TIFF (CCITT– Group 4) Bibliotheca Alexandrina 19

OCR Image to Text Bibliotheca Alexandrina

OCR - Arabic § Poses unique challenges – – – Written cursively, with blocks of connected characters a ‘block of characters’ can have more than one base line. Uses external objects such as dots, 'Hamza' and 'Madda'. Diacritization Characters can have more than one shape according to their position – Overlapping makes it difficult to determine the spacing § Sakhr Automatic reader is used § Tricky with old books § Requires learning Bibliotheca Alexandrina 21

Arabic Script Is Cursive Bibliotheca Alexandrina 22

Old, Smudgy, and Sticked Together Bibliotheca Alexandrina 23

Use of Diacritics Bibliotheca Alexandrina 24

Pre-OCR Text Enhancement § Condition of Arabic printings varies – Old/new – Light/heavy – Solid/dot-matrix § Scan. Fix’s smoothing and completion features improve recognition accuracy § Separate from actual processing phase – Must be tested under OCR right away – OCR specialists have a better feel for “good text” Bibliotheca Alexandrina 25

Text Repair in Scan. Fix Bibliotheca Alexandrina 26

Font Libraries § Improvement of Arabic OCR results through – Tweaking of OCR engine settings – Learning § Libraries for different fonts have been built to achieve higher recognition rates § Databases of character glyphs that describe a particular type of script and improve OCR accuracy § Built on a carefully selected and classified high-variety set of scanned images belonging to a batch of about 1000 books that boiled down to 15 font groups Bibliotheca Alexandrina 27

Font Classification § Classification criteria: – Script type • TA: Traditional Arabic • AR: Arabic Transparent • DT: Deco type Naskh and Deco type Naskh extension – Printing quality: High (H), Medium (M), and Low (L) – Font size: 1 (largest) to 5 (smallest) § “Group X” – virtual font to tag unclassifiable printings and handwriting § Minimum accuracy number assigned to each group based on testing results Bibliotheca Alexandrina 28

16 Font Groups Bibliotheca Alexandrina 29

Learning § Train the engine on two representational pages of the book to build upon an initial font file picked from a set of prebuilt font libraries § Use a different page to manually calculate OCR accuracy before and after learning § Batch OCR book using learned font file and save to ART Bibliotheca Alexandrina 30

Learning in Sakhr’s Automatic Reader Bibliotheca Alexandrina 31

VERUS from Novo. Dynamics § Preliminay evaluation on two data sets is promising – Challenge: difficult to OCR, degraded images – Normal: known to return acceptable accuracy § No learning capabilities—no human operators § VERUS uses an XML format to store recognition data § BA and Novo. Dynamics entered into a research agreement Bibliotheca Alexandrina 32

Evaluation of VERUS and AR Bibliotheca Alexandrina 33

Encoding Image on Text Bibliotheca Alexandrina

Challenges in Publishing § Preservation of layout § Searchability of content and metadata § Efficient image compression § Easy browsing of books § Accommodating low bandwidth user § Multilingual text support § Multipaging Bibliotheca Alexandrina 35

Image-on-Text § Multilayered: – Visible page image – Hidden OCR text § View exact original layout while searching and highlighting § Supported with some OCR suites only § Supported format: DJVU and PDF Bibliotheca Alexandrina 36

UDBE § Universal Digital Book Encoder § A framework for integrating many OCR engines and supporting many target formats into a system for encoding image-on-text documents for publishing § Made possible through the use of a Common OCR Format (COF) Bibliotheca Alexandrina 37

UDBE § Built around a Common OCR Format (COF) Bibliotheca Alexandrina 38

Performance – Arabic B&W Bibliotheca Alexandrina 39

Performance – Latin B&W Bibliotheca Alexandrina 40

Quality Assurance Bibliotheca Alexandrina

Q/A - Common Errors § § § No missing cover or pages All pages are in order Text quality Images quality PDF quality Bibliotheca Alexandrina 42

Q/A - Common Errors § § § No missing cover or pages All pages are in order Text quality Images quality PDF quality Bibliotheca Alexandrina 43

Q/A - Common Errors § § § No missing cover or pages All pages are in order Text quality Images quality PDF quality 17 Bibliotheca Alexandrina 44

Q/A - Common Errors § § § No missing cover or pages All pages are in order Text quality Images quality PDF quality § Curved Pale Text Toothed Text Bibliotheca Alexandrina 45

Q/A - Common Errors § § § No missing cover or pages All pages are in order Text quality Images quality PDF quality Bibliotheca Alexandrina 46

Q/A - Common Errors § § § No missing cover or pages All pages are in order Text quality Images quality PDF quality §§ Skew §Noise Pages Fingers Cut Pages and Sizepage edges Bibliotheca Alexandrina 47

Q/A - Common Errors § § § No missing cover or pages All pages are in order Text quality Images quality PDF quality § Image on Text § Searching Hits Bibliotheca Alexandrina 48

DAR Digital Assets Repository Bibliotheca Alexandrina

System Architecture Bibliotheca Alexandrina 50

DAK - Metadata § Descriptive Metadata § Administrative Metadata § Technical Metadata Bibliotheca Alexandrina 51

DAK Publishing Module § Providing access to the repository content through search and browse facilities § Multilingual full-text search Bibliotheca Alexandrina 52

DAK Publishing Module § Functionalities – Browse the repository contents by Collection, Subject, Creator and Title – Search content by an indexed metadata field – Multilingual full-text search using both exact and morphological matching Bibliotheca Alexandrina 53

DAK Publishing Module § Functionalities (cont’d) – Display brief record information – Display full record information with links to digital objects – Display MARC and DC format Bibliotheca Alexandrina 54

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Show notes Bibliotheca Alexandrina 59

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DAR: Future Work § Consider MODS and METS standards in the new system data model. § Enhance the functionalities of the Books Viewer with more security and copyright management § Join the Open Source community by building DAR modules with open source technologies and languages. § Provide support for the currently available digital library interoperability protocols Bibliotheca Alexandrina 61

Books from India Towards Better Collaboration Bibliotheca Alexandrina

Books From India Languag e Arabic Number Books 832 Arabic + French 3 Arabic + Germa n 1 Persian 101 French 2 English 1 Spanish 1 German 1 Total 942 Bibliotheca Alexandrina 63

Progress Phase Name Done as of November 1, 2006 Expected to finished by Comments Cataloging 801 - Processing 742 November 20, 2006 OCRing 200 March 1, 2007 Encoding 171 - - Publishing 171 - - Bibliotheca Alexandrina 35 have metadata problems 64

Metadata Problems Bibliotheca Alexandrina 65

Processing Bibliotheca Alexandrina 66

OCR Using VERUS or AR? § Calculated accuracy for a small sample – Images processed once with darkening effect and once without – VERUS likes darkening, AR does not – Overall, AR won 70% of cases Bibliotheca Alexandrina 67

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