We analyze the problem of optimal data partitioning of MPEG-2 coded video in an operational rate-distortion context. The optimal algorithm is characterized and shown to have high complexity and delay. A causally optimal algorithm based on Lagrangian optimization is proposed, that optimally solves the problem for intra (I) pictures, while it provides an optimal solution for predicted/interpolate...

We present a novel system for collaborative annotation of multiview video using a web-based application framework. The serverside synchronizes multiple users annotating video. A XML data scheme allows streaming updates to the server and clients so that all clients are updated in real-time. The interface for annotation is also used for visualization of the rich media, with the aim to allow users...

The VideoAnnEx, a.k.a. IBM MPEG-7 Annotation Tool, assists authors in the task of annotating video sequences with MPEG-7 metadata. Each shot in the video sequence can be annotated with static scene descriptions, key object descriptions, event descriptions, and other lexicon sets. The annotated descriptions are associated with each video shot or regions in the keyframes, and are stored as MPEG-7...

a r t i c l e i n f o a b s t r a c t The method based on Bag-of-visual-Words (BoW) deriving from local keypoints has recently appeared promising for video annotation. Visual word weighting scheme has critical impact to the performance of BoW method. In this paper, we propose a new visual word weighting scheme which is referred as emerging patterns weighting (EP-weighting). The EP-weighting sch...

Screen video recording is a common component of usability testing. We have developed tools for reviewing and analyzing the video more efficiently. The tool: 1) breaks up a video into shorter segments and provide a compact pictorial summarization of the video; 2) provides a variety of ways for accessing video; 3) allows web-based review of video; and 4) provides a web-based way to post and view ...

A novel video splicing method is proposed which minimizes the tune-in time of “channel zapping”, i.e. changing from one audiovisual service to another, in IP datacasting (IPDC) over Digital Video Broadcasting for Handheld terminals (DVB-H). DVB-H uses a time-sliced transmission scheme enabling a receiver to turn radio reception off for those time-slices that are not of interest to the user and ...

The beginning of the 20 th century was met with the invention that changed forever the way people saw the world. The invention, named the motion picture, was made using a technological breakthrough that enabled displaying pictures so fast (faster than 16 frames a second) that the human eyes perceived them as a single object—a movie. Now, in the beginning of the 21 st century, it is fascinating ...

We present a framework for annotating dynamic scenes involving occlusion and other uncertainties. Our system comprises an object tracker, an object classifier and an algorithm for reasoning about spatio-temporal continuity. The principle behind the object tracking and classifier modules is to reduce error by increasing ambiguity (by merging objects in close proximity and presenting multiple hyp...

Animation is commonly seen as an ideal tool for teaching dynamic phenomena. While there have been very few studies testing this hypothesis, animations are used extensively in teaching, particularly in the eld of algorithms. We highlight features that we consider important for animation systems, describe the development of algorithm animation by examples, and present a new Java-based system supp...