With a text-based approach, image description can either be achieved with controlled vocabularies or with terms directly extracted from the natural language.
Image description comprises more than the fields in which a controlled vocabulary may be implemented. Used mainly to identify a primary subject and the broader category of an item, controlled vocabularies and taxonomies constitute a small but critical percentage of the metadata associated with any item being classified
The association with libraries, museums and governmental organizations such as NASA requires that all descriptive content for these resources be accessible to an even larger audience, which once again depends upon the stable foundation provided by professional indexing practice.
Chart on pg 12
image retrieval is more efficient when the indexing approach combines the controlled and the uncontrolled vocabularies,
On one hand, the combined use of controlled and uncontrolled vocabularies can be advantageous to improving the retrieval efficiency, as reported by Rao Muddamalle (1998), who stressed that the combination of both approaches improved by 5 percent the retrieval results from each approach examined separately, and Matusiak (2006), who stated that the two approaches should not be considered as alternatives but as complementary resources.
On the other hand, this double indexing, if adopted, also requires an increase in the indexing time.
If a picture is worth a thousand words, then… (article – 1999)
Of-ness “Look at the image, choose descriptors that reflect the objects, people and events.
About-ness “aboutness questions cannot be answered by ofness indexing because there is no overlap of question and answer. A level of interpretation must be incorporated. Reflects the relationships between the elements.
- Familiarize yourself with the intended audience and index for them.
- Use rigorous vocabulary control.
- Establish policies about levels of indexing for consistency
- Develop analytical frameworks that prompt for various aspects of the subjects.
- Encourage research and experimentation, and evaluation and discussion of results.