Keyphrases
- web corpora
- information retrieval
- information retrieval systems
- small scale
- key technologies
- query expansion
- real world
- data mining
- retrieval method
- retrieval systems
- multimedia databases
- document retrieval
- multimedia collections
- unknown words
- web scale
- test collection
- similarity search
- word segmentation
- image database
- relevance feedback
- image retrieval
- chinese web