This paper presents a new media transport scheme that flexibly combines media components on broadcast channels and broadband networks so that end users can conveniently consume favorite content without being aware of its delivery channels. By taking advantage of the different delivery characteristics of broadcast channels and broadband networks, hybrid delivery offers an effective means of stably providing customized content to each user. In hybrid delivery systems, generic components for a wide range of users are delivered on broadcast channels, and additional components customized to users' interests or locations are delivered on broadband networks. Our proposed scheme enables each user to flexibly combine those components. We have implemented the proposed scheme in a prototype hybrid delivery system. The experimental results demonstrate that the scheme achieves hybrid delivery of content on broadcast channels and broadband networks.

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SUMMARYIn this paper, we describe a new method for moving object extraction based on a background image subtraction method to be applied to an object-based picture coding system. Since this method requires a background image, we have to represent the background from a moving picture that has been shot already. We propose a new method in which the background image is reproduced by a temporal histogram of each pixel in the picture and a watershed algorithm is employed for region growing to acquire precise edge detection of the moving objects. Furthermore, a spatiotemporal watershed algorithm is introduced in order to prevent judder of the extracted objects.