What are the foreseen elements of MPEG-7?
MPEG-7 work is currently seen as being in three parts: Descriptors (D’s), Description Schemes (DS’s), and a Description Definition Language (DDL). Each is equally crucial to the entire MPEG-7 effort. Descriptors are the representations of low-level features, the fundamental qualities of audiovisual content which may range from statistical models of signal amplitude, to fundamental frequency of a signal, to an estimate of the number of sources present in a signal, to spectral tilt, to emotional content, to an explicit sound-effect model, to any number of concrete or abstract features. This is the place where the most involvement from the signal processing community is foreseen. Note that not all of the descriptors need to be automatically extracted–the essential part of the standard is to establish a normalized representation and interpretation of the Descriptor. We are actively seeking input on what additional potential Descriptors would be useful. Description Schemes are structured c
