Keyphrases
- text retrieval
- information retrieval
- document collections
- cross language
- multimedia retrieval
- keyword extraction
- query expansion
- latent semantic indexing
- document retrieval
- image retrieval
- inverted file
- retrieval quality
- natural language
- semantic information
- retrieval model
- retrieval systems
- databases
- information extraction
- digital libraries
- feature extraction
- machine learning