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The Watch-and-Comment paradigm has been proposed as the seamless capture of comments made by users when appreciating a video, which is watched using a computer or a TV set, for example. The comments can be associated with the original media in several ways so as to generate interactive videos automatically -the interactive video corresponding to the original video annotated with the captured comments. In this paper we explore the application of the Watch-and-Comment approach in situations in which the annotations are represented by operators used for the discrimination of instants and time intervals within continuous media. This particular type of annotation can be performed collectively by several users, over distinct instances of media and, for recorded media, at different times. Once these discriminations are available, combinations of the annotations may be employed by several classes of applications such as those which exploit collaborative selection, voting, cutting, classification and evaluation. We show the feasibility of the operators by implementing a proof-of-concept prototype on a Digital Television platform: the prototype supports multiple geographically distributed users who, using distinct input devices, perform collaborative tasks not planned in the original interactive-TV applications.

In this paper we discuss the problem of how to discriminate moments of interest on videos or live broadcast shows. The primary contribution is a system which allows users to personalize their programs with previously created media stickers-pieces of content that may be temporarily attached to the original video. We present the system's architecture and implementation, which offer users operators to transparently annotate videos while watching them. We offered a soccer fan the opportunity to add stickers to the video while watching a live match: the user reported both enjoying and being comfortable using the stickers during the matchrelevant results even though the experience was not fully representative.

Digital TV provides greater interaction between content/service and the viewer. Besides interacting with resident applications, the possibility of access services external to the set-top box expands the range for interactive applications. This paper explores the Watch-and-Comment (WaC) paradigm and proposes its specialization for the collective discrimination of moments and segments of continuous media, for use in applications such as: selection, voting, exclusion, classification, evaluation, among others. As a proof of concept, we developed a prototype of software that extends the middleware Ginga to support the collective discrimination of moments and segments of continuous media in digital TV. The prototype supports multiple devices and uses the Universal Plug and Play (UPnP) protocol to discover services.