Table I.
Mean average precision and precision at 5 (P@5) for 30 image retrieval requests
| Indexed text and query type ( the request was used as supplied if query expansion is not indicated) | MAP | Precision at 5 | ||
|---|---|---|---|---|
| Lucene | Terrier | Lucene | Terrier | |
| Short captions provided by ImageCLEFmed | 0.151 | 0.045 | 0.347 | 0.200 |
| Full captions | 0.142 | 0.079 | 0.347 | 0.160 |
| Segmented captions | 0.149 | 0.081 | 0.353 | 0.167 |
| Mentions | 0.026 | 0.036 | 0.166 | 0.000 |
| Captions and mentions | 0.122 | 0.160 | 0287 | 0.386 |
| Captions + query expansion | 0.153 | 0.082 | 0.420 | 0.200 |
| Captions and mentions + query expansion | 0.131 | 0.169 | 0406 | 0.387 |