Keyphrases
- text retrieval
- latent semantic indexing
- document collections
- document retrieval
- query expansion
- information retrieval
- inverted file
- image retrieval
- keyword extraction
- multimedia retrieval
- retrieval systems
- retrieval model
- cross language
- automatic query expansion
- optical character recognition
- retrieval quality
- blind relevance feedback
- active learning
- textual information retrieval