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Figure 2.21 MPEG-7 multimedia description schemes overview.
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Content Management Content Description Structural Aspects Summaries Semantic Aspects
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color, movement (describing trajectory), texture, and position in the scene s space. Similarly, for audio material, low-level descriptions might be key, mood, tempo, location in sound space, tempo changes, etc. However, the highest level would give semantic information, such as the scene with the barking brown dog next to the boy in blue, with lots of traffic noise in the background. Intermediate levels of abstraction may also be used. The lower-level descriptions lend themselves to automatic extraction from the data, whereas the higher-level ones will probably require human intervention. After giving a description of the content, MPEG-7 defines other types of information about the multimedia data. The form of the data is defined. An example of the form might be the coding scheme used (i.e., JPEG, MPEG-4) or the overall data size. This information helps in
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determining whether or not users can read this type of information with the devices they are using. Conditions for accessing the material are included, including links to a registry with intellectual property rights information and price. This is where MPEG-7 metadata links to digital rights management expressions. MPEG-7 defines a classification, including parental ratings and division, into a number of predefined categories. There is also provision for links to other relevant material, which may help a user search more rapidly. Finally, context information, such as the occasion of the recording (e.g., Sydney Olympic Games, 2000 women s 100 meter sprint final) is stored. MPEG-7 content description tools will allow the creation of descriptions. These will take the form of a set of instantiated description schemes (the framework used to categorize the information) and the descriptors defining that content. Some schemes may include:
Information describing the creation and production process of the content (e.g., director, title, short feature movie) Information related to the usage of the content (e.g., copyright pointers, usage log, and broadcast schedule) Information about the storage features of the content (e.g., storage format, encoding) Structural information on spatial, temporal, or spatio-temporal components of the content (e.g., scene cuts, segmentation in regions, region motion tracking, thumbnails) Information about low-level features in the content (color palette, textures, sound timbres, melody description) Conceptual information of the reality captured by the content (e.g., people and events, interactions between on- and off-screen objects or people) Information about how to browse through the content in an efficient way (e.g., using summaries, variations, change control logs, spatial and frequency sub-bands) Information about collections of objects Information about the interaction of the user with the content (e.g., user preferences, usage history)
All of these descriptions are coded in an efficient way for searching and filtering. MPEG-7 data may be physically located with the associated AV material, in the same data stream or on the same storage system, but the descriptions could also live somewhere else on the globe, in some mas-
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sive database, for example. When the content and descriptions are not colocated, mechanisms that link AV material and their MPEG-7 descriptions are needed and these links need to work in both directions. The MPEG-7 standard does not define a monolithic system for content description, but rather a set of methods and tools for the different viewpoints of the description of audiovisual content. With this in mind, MPEG-7 has taken into account more application-specific viewpoints under consideration by other standards bodies, including the SMPTE (Society of Motion Picture and Television Engineers) Metadata Dictionary, Dublin Core, EBU P/Meta, and TV Anytime. MPEG-7 uses an XML (Extensible Markup Language) schema as the language of choice for the text representation of descriptions. This choice should allow interoperability with other systems in the future. There is a binary format (BiM) defined in the standard as well. For describing audio, MPEG-7 provides five technologies:
The audio description framework (which includes scalable series, lowlevel descriptors and the uniform silence segment) Musical instrument timbre description tools Sound recognition tools Spoken content description tools Melody description tools
Within the audio description framework, audio may be described using samples taken at regular intervals, or by defining segments that demark regions of similarity and dissimilarity within the sound. Samples or segments can be described by both scalar values, such as power or fundamental frequency, and vector values, such as spectra, summarizing the values for that sample or segment. Scalable series allows progressive downsampling of the sample or segment values contained in the series, providing various summaries along the way, like minimum fundamental frequency, maximum peak audio level, or variance of the descriptor values, as examples. Low-level descriptors include instantaneous waveform and power values and a power spectrum, with spectral centroid, spread and flatness, fundamental frequency and harmonicity, attack time, timbral spectral, and temporal characteristics and spectral basis. The silence descriptor attaches the simple semantic of silence to an audio segment, which may be used to segment the audio stream further, or else as a hint not to process the segment. Musical instrument timbre-description tools aim at describing the perceivable features of instrument sounds. Timbre is defined as the features
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