Technical advance in creating, storing digital media in daily life enables computers to capture human life and remember it as people do. A critical point with digitizing human life is how to recall bits of experience that are associated by semantic information. This paper proposes a technique for structuring dynamic digital object based on MPEG-21 Digital Item (DI) in order to recall human’s memory and providing interactive TV service on family tree albuming system as one of its applications. DIs are a dynamically reconfigurable, uniquely identified, described by a descriptor language, logical unit for structuring relationship among multiple media resources. Digital Item Processing (DIP) provides the means to interact with DIs to remind context to user, with active properties where objects have executable properties. Each user can adapt DIs’ active properties to tailor the behavior of DIs to match his/her own specific needs. DIs’ technologies in Intellectual Property Management and Protection (IPMP) can be used for privacy protection. In the interaction between the social space and technological space, the internal dynamics of family life fits well sharing family albuming service via family television. Family albuming service can act as virtual communities builders for family members. As memory is shared between family members, multiple annotations (including active properties on contextual information) will be made with snowballing value.
Imperceptibility and robustness including complexity are important
issues in watermarking system, so it is desirable to consider
these issues on design of watermarking system. In this paper, we
will propose one of video watermarking in which motion between
three continuous frames is utilized in order to provide the
imperceptibility, robustness and acceptable complexity. Region <i>R</i> for watermarking is retrieved from three frames <i>f</i>(<i>t</i>), <i>f</i>(<i>t</i>+1) and <i>f</i>(<i>t</i>+2), and the watermarks which conveys a payload of <i>L</i> bits are embedded into DCT coefficients of Region <i>R</i>. Experimental results show that the proposed method could provide good fidelity and the robustness against MPEG-2 compression as well as some frame attacks.