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User Modeling in MPEG-7

preferences user’s information content

Definition: User modeling refers to building a profile of the user’s preferences for consumption and usage. In MPEG-7, two tools are specifically implemented for user interaction, which are the User Preferences DS and the User History DS.

Just as we have to model the content to describe the rich multi faceted detail stored both semantically and structurally, we must also model the user in a similar fashion, building a profile of the user’s preferences for consumption and usage. The requirements are different but the concept remains similar, model the user by capturing the many multi faceted perspectives of the user that combine to describe the mental and corporeal needs of the user. The mental needs are the user’s interests and needs for specific information; the corporeal is how, when and where they would like to view that information. The main difference between content modeling and user modeling is that the former is temporally static after creation and the latter evolves continuously over time.

As the user evolves their preferences for information, usage environment and demographic data change as well. The user model must also evolve with the changing user or the model will stagnate. Demographic data does not change a great deal over time and can be adjusted manually. The user’s preferences for information and to a lesser extent the usage environment data change at a much greater rate and to update this manually would be impractical. Automatic methods that track and log the user’s interaction can do this without any explicit effort from the user. Although the extraction methods can be proprietary or technology specific the logging of the interactions must be MPEG-7 compliant.

Defined in MPEG-7 MDS are two tools that have been specifically implemented for user interaction, namely the User Preferences DS and the User History DS. The User Preferences DS contains all the tools to describe the user both mentally and corporeally by being able to state the preferences for information contained in other tools within MPEG-7 as well the usage environment of the user. The user model consists of three separate components; preferences for content (e.g. movies, books, etc), demographic information (e.g. language, gender, etc) and usage environment (i.e. location, time, etc).

The User History DS is the MPEG-7 logging tool for user interactions; it logs the interaction with the user in terms of content viewed, the interaction with the content and where and when interactions took place. The User History DS is then analyzed and used to update the user model, keeping it current to a user’s changing needs. User Preferences DS and the User History DS tools can be customized to include or exclude features of the user to provide a granular detail of the user’s preferences and consumption requirements. This provides the same amount of rich and perceptively textured description of the user as you would have for content but with the additional functionality of evolving the model as the users needs change.

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over 2 years ago

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about 4 years ago

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