This is the official online answer, Mark down first.
http://www.semanticmetadata.net/wiki/lirefaq/
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Can I use multiple features for search?
This depends very much on the the the the "How to combine the features." You should not add or subtract relevance scores – not even weighted! That's because of the fact that the metric spaces, spanned by each feature, is not compatible (no real scientific explana tion, but still you might get the idea). Possible approaches is
- Result list merging, where search for each feature returns its own result list and the mash them in some (e.g. medium Rank
- Combined filtering and ranking, where you use the one feature to select the results and another to rank them for a ranked Resul T list
- Machine learning, where do I learning methods to fit parameters and select appropriate dimensions for retrieval in your Image domain
How to use multiple features in a lire search