How are the MPEG-7 Multimedia Description Schemes different from MPEG-7 Descriptors?
Although there is no formally stated distinction, generally, MPEG-7 Descriptors address the low-level perceptual features of multimedia data and are meant to be extracted automatically. In many cases Descriptors correspond to the perceptual attributes of multimedia data and its regions and segments, such as to describe the color of a region. Furthermore, the Descriptor data is typically not human-readable since the Descriptor provides a compact binary description of a feature of the multimedia data. On the other hand, the Description Schemes (DSs) are defined using DDL and produce human-readable XML descriptions.
