Maeder nov2011
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Maeder nov2011






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Maeder nov2011 Maeder nov2011 Presentation Transcript

  • Design Considerations for Digital Image Libraries Professor Anthony MaederSchool of Computing, Engineering & Mathematics, University of Western Sydney, Sydney, Australia 1
  • 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
  • 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
  • Resolving IssuesVary image physical properties according to contentTune library implementation to suit usage/viewer needsProvide hierarchy of library content representation 6
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  • Digital Image Library DesignPrinted Digital Process Index/tag StoreImage Scanning Image Image Image Stored Image Image Image Displayed Image retrieve adjust display Image 9
  • 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
  • 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
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  • Human Visual Perception 1 Sensations in Eyes2 Processing in Brain 3 Models in Mind 15
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  • Eye trackingSuccessive eye positions and saccades. Positions of fixation of gaze. 17
  • Image Content “Importance” 18
  • Importance MappingLocations of high importance. Positions of fixation of gaze. 19
  • DIL Hierarchy – Image Versions Low-res Mid-res High-res Image Image Image Browse Inspect Analyse Search Assess Publish Organise Copy Exhibit 20
  • Morija Mission 21
  • Morija Museum and Archives 22
  • 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
  • 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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  • 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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  • 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
  • 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
  • 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 33