Image, Audio, and Video Extenders Administration and Programming
To query by image content:
- Create a QBIC catalog for the images.
- Catalog the images. This means adding entries for the images to the
catalog and storing values for image features.
See QBIC catalogs for a description of QBIC catalogs and image
features.
- Build a query. The query identifies the features to be used as
search criteria, their values, and their weights (that is, emphasis to be
placed on each feature). You can specify these query attributes in a
character string that is called a query string. Alternatively, you can
create a query object and associate these attributes with the query
object. You can then save the query string and reuse it.
- Run the query. When you run the query, you specify a query string
as input, or you identify a query object for the query. In either case,
you also identify the images to be searched. In either case, you can
submit the query from the DB2 command line or from within a program.
In response, the Image Extender computes the feature values for the
query. It compares the value to the feature values that are stored in
the QBIC catalog for the target images. The Image Extender then
computes a score that indicates how similar the feature values of each target
image are to the source.
You can tell the Image Extender to return the images whose feature values
are most similar to the source. You can also tell the Image Extender to
return the scores of one or more images.
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