By Borgioli G., Totaro S.
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Extra info for 3D-Streaming Operator With Multiplying Boundary Conditions: Semigroup Generation Properties
Nevertheless, some personalisation efforts have been made, especially in the domain of television broadcasting. The evolution of digital TV systems has resulted into an unprecedented number of available programs. Appearance of digital and interconnected devices, such as digital TVs and settop boxes, and current generation of electronic programme guides go some way to assist users in selection of interesting programmes, but that is hardly enough. Users still need to manually search programme listings and with the 18 INTELLIGENT INTEGRATED MEDIA COMMUNICATION TECHNIQUES ever-increasing number of programmes, this task is getting more and more cumbersome.
The distortion caused by the reduced bitrate notation follows the boundaries given by the well known Rate-Distortion relation, R(D). The typical use of the above relations is known from many algorithms for optimal image encoding. There exist two well known optimisation strategies, namely to find the best possible encoding for: a predefined quality or a predefined bitrate. In each case, the goal of the procedure is to select encoding parameters to be as close as possible to the theoretical boundaries of the R(D) (or D(R)) function relation.
In general it is clear that explicit feedback requires more effort from the user and can as such be annoying for him or her, but the information obtained from explicit feedback bring better results, since the system is not guessing about user preferences or suitability of recommended data items. On the other hand, implicit feedback is less disturbing for the user, but the conclusions about users’ likings usually are more imprecise. Individual and collaborative filtering differs in the number of user profiles involved in the personalisation process.