ImageClass

The Image Class is specifically an access system for image databases. Michigan provides an image database hosting service to the campus.

• Data
  • Image Class is intended for continuous tone (8 bit grayscale, 24 bit color) images. Supported are thumbnail images in the JFIF/JPEG format and full size images at multiple resolutions in the SID (MrSid from LizardTech. Master images are typically in the TIF format.
  • Descriptive metadata about images comes from a variety of database sources and is SGML encoded (see also Image Class DTD) and indexed with XPat.
• Image Class Functionality
  • Retrieve text data and thumbnails
  • Retrieve full record and large image
  • Search across multiple collections, or a single collection
  • Create personal Portfolios of images, saved on the server for use at a later date.
• Getting Things Done
  • Sessions are used to carry along IDs for search results and information about collections (collsinfo object).
  • Collection Database (colldb) is used for configuration of collections.
  • Use of IDs for results navigation
  • Access Retrictions
  • MrSid
  • Objects, modules used
    • CollsInfo, GroupsInfo, XPat, and XPatResultSet, Query Factory and TermMapper, BookBag, ProcIns, DlpsSession, DbUtils
    • CGI, Apache::Session, Auth
• Bookbag for portfolio (saving in a database)
• Image Retrieval:
  • thumbnails
  • getimage-idx
  • MrSid interactions complexity
  • jpeg
• Flowchart to show decision tree for Search, ID cache, Portfolio, ...
• Customization/Configuration
  • colldb, groups, imageclass.cfg
  • Interface Customization
    • xcoll, coll specific
    • JavaScript
    • CSS
  • Code customization
    • <?ALLPURPOSE>
    • Other
• Documentation
  • http://docs.umdl.umich.edu/class/image/imageindex.xml