Keyphrases
- collaborative tagging
- social tagging systems
- information retrieval
- tag recommendation
- database
- semi automatic
- tagging systems
- metadata
- web resources
- image indexing
- image tagging
- indexing method
- indexing scheme
- error prone
- labor intensive
- automatic indexing
- semantic relations
- manual annotation
- social tagging
- content based retrieval
- collaborative filtering