1. INTRODUCTION
1.1. Problems and Tasks
1.2. Scope, Aims, and Organization

2. TAXONOMY AND REVIEW
2.1. Foundations
2.2. Media for tag relevance
2.3. Learning for tag relevance
2.4. Auxiliary components

3. A NEW EXPERIMENTAL PROTOCOL

4. METHODS SELECTED FOR COMPARISON
4.1. Methods under analysis
4.2. Considerations

5. EVALUATION
5.1. Tag assignment
5.2. Tag refinement
5.3. Tag retrieval
5.4. Flickr versus ImageNet

6. CONCLUSIONS AND PERSPECTIVES
6.1. Concluding remarks
6.2. Reflections on future work