CBIR Content Based Image Retrieval

							      CBIR
Content Based Image
     Retrieval
Typical CBIR System
     Similar Images         Query Processor
        I 4, I 8, … I k          outputs
                          the list of images in
                          decreasing order of
                                similarity
            F(Iq)
                          Attribute Comparison
                              using distance
      Color histogram            function
                                   f(x)
       Texture Desc
       Shape details
                          Feature Extraction

      Iq - Query Image
       I1, I2, .. Image
             Files
         Applications
 The need to retrieve images from a collection is there in
 the following disciplines.
 Satellite Image databases, Geographic Information System(GIS)
  Architectural Design
 Reconnaissance flights and Military
 Crime prevention (Finger prints and face recognition)
 Journalism and TV production
 Art galleries and Museum Management
 Advertising and Publishing
 Fashion and Fabric design
 Video on Demand
 Medicine
 E-Commerce and Intellectual Property (trade mark registration and
   copy right management). ex: a trademark can only be assigned if it
   does not resemble those in the database too closely.
Unfortunately not many from these disciplines know about CBIR.
             User Query Example




               Sorted results




  Image
results of
the user’s
  query
                Results(continued)
Retrieval result examples:
• Example 1: query mode, using color features




           (a)         (b)         (c)           (d)          (e)
    Query mode result sample: (a) The query image. (b)-(e) The
  similar image returned by the retrieval system. They are ranked
  by the color similarity measurement, with (b) having the highest
                              ranking.
Airborne Laser Terrain Mapper
           Components of LIDAR

• Laser Scanner (33-100 Pulses/sec)
• GPS receiver
• Inertial Navigation System
• The scanner records the difference in time
  between emission of the laser pulse and the
  reflected signal.
• The x,y,z coordinates of each ground point are
  computed.
• Accuracy : 15 cms at 1000m flying height
Airborne Laser Terrain Mapper – Florence City
Airborne Laser Topographic Mapper – Power Line Sag Measurments