Maeder nov2011

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Maeder nov2011

  1. 1. Design Considerations for Digital Image Libraries Professor Anthony MaederSchool of Computing, Engineering & Mathematics, University of Western Sydney, Sydney, Australia a.maeder@uws.edu.au 1
  2. 2. OutlineIssues in constructing digitized photographic collectionsDesign criteria based on image characteristics and usageModelling information content using importance mapsApply modelling to Morija Museum and Archives example 2
  3. 3. IssuesEmphasis on “fixed choice” for physical image propertiesVariety of usage and viewer situations and purposesControl of access efficiency and scalability (eg mobile) 5
  4. 4. Resolving IssuesVary image physical properties according to contentTune library implementation to suit usage/viewer needsProvide hierarchy of library content representation 6
  5. 5. 7
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  7. 7. Digital Image Library DesignPrinted Digital Process Index/tag StoreImage Scanning Image Image Image Stored Image Image Image Displayed Image retrieve adjust display Image 9
  8. 8. DIL Management - Usage StagesInput/Scan: spatial resolution, greyscale/colour gamutProcessing: noise, blur, contrast, crop, warpStorage: compression, purpose, content, multipleDisplay/Print: map to screen/page size and characteristics 10
  9. 9. DIL Data - Perceptual FactorsSpatial: pixel density, spacing, aspect ratio, shape, sizeIntensity: pixel brightness, contrast, colour values, gamutQuality: visual appearance, sharpness, clarity, aliasingInformation: visual content density, localization, spread 12
  10. 10. 13
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  12. 12. Human Visual Perception 1 Sensations in Eyes2 Processing in Brain 3 Models in Mind 15
  13. 13. 16
  14. 14. Eye trackingSuccessive eye positions and saccades. Positions of fixation of gaze. 17
  15. 15. Image Content “Importance” 18
  16. 16. Importance MappingLocations of high importance. Positions of fixation of gaze. 19
  17. 17. DIL Hierarchy – Image Versions Low-res Mid-res High-res Image Image Image Browse Inspect Analyse Search Assess Publish Organise Copy Exhibit 20
  18. 18. Morija Mission 21
  19. 19. Morija Museum and Archives 22
  20. 20. MMA User Group Needs• Citizens and Tourists: curiosity and browsing• School Students: education and awareness• Scholars and Researchers: content analysis• Sponsors and Agencies: aggregation and publicity 23
  21. 21. MMA CollectionsMissionary history: buildings, people, scenerySotho culture: clothing, household, huntingGeological items: dinosaur bones, fossils, samplesOther materials: maps, drawings, rock paintings 24
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  25. 25. Example: Missionary HistoryPrints range from 3x4 inch to 6x8 inch monochromeDigitize on flatbed scanner 400dpi x 8bpp (4-5MB raw)Reduce in software to 200dpi and 100dpi JPEG versions 28
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  28. 28. Example: Missionary HistoryStore with text and tags in Microsoft Access databaseBrowsing software “eMuse” to retrieve thumbnails firstScreen quality versions obtained by clickthroughReproduction quality versions held for access on request 31
  29. 29. ConclusionThe project is still in an “investigation” phaseThe design principles have been useful for decisionsApplicability needs to be tested on some other cases 32
  30. 30. Contact InformationProfessor Anthony MaederProfessor in Health InformaticsSchool of Computing, Engineering and MathematicsUniversity of Western Sydney – Campbelltown CampusPrivate Bag 1797, Penrith 2571, Sydney, NSW, Australia+61 2 4620 3462 / +61 403 160 424a.maeder@uws.edu.au 33

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