MPEG-7 is an ISO/IEC standard being developed by MPEG (Moving Picture Experts Group), the committee that also developed the successful standards known as MPEG-1 (1992) and MPEG-2 (1995), the MPEG-4 standard (Version 1 in 1998, and version 2 in 1999).
The MPEG-1 and MPEG-2 standards have enabled the production of widely adopted commercial products, such as CD-interactive, DVD.MPEG-4 is the first real multimedia representation standard, allowing interactivity and a combination of natural and synthetic material, coded in the form of objects.
MPEG-7 is formally called ‘Multimedia Content Description Interface’, a means of attaching metadata to multimedia content.
MPEG-7 is a standardized description of various types of multimedia information. This description will be associated with the content itself, to allow fast and efficient searching for material that is of interest to the user. The standard does not comprise the (automatic) extraction of descriptions/features.Nor does it specify the search engine (or any other program) that can make use of the description.
In other words: MPEG-7 specifies a standard set of descriptors that can be used to describe various types of multimedia information. MPEG-7 also standardizes ways to define other descriptors as well as structures (Description Schemes) for the descriptors and their relationships. This description (i.e. the combination of descriptors and description schemes) is associated with the content itself, to allow fast and efficient searching for material of a user’s interest. MPEG-7 also standardizes a language to specify description schemes, i.e. a Description Definition Language (DDL). AV material that has MPEG-7 data associated with it, can be indexed and searched for. This ‘material’ may include: still pictures, graphics, 3D models, audio, speech, video, and information about how these elements are combined in a multimedia presentation (‘scenarios’, composition information). Special cases of these general data types may include facial expressions and personal characteristics.
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