Compressed Domain C. W. Ngo, T. C. Pong & R. T. Chin Department of Computer Science The Hong Kong University of Science & Technology Clear Water Bay, Kowloon, Hong Kong fcwngo, tcpong, [email protected] Abstract| With the wide spread use of WWW, digital libraries are expected to handle more visual information in the future. Furthermore, most of the data are represented in compressed formats due...

Compressed digital video is one of the most important types of traac in future integrated services networks. It is dif-cult to support this class of traac since, on one hand, compressed video is bursty, while on the other hand, it requires performance guarantees from the network. The common belief is that we are unlikely to achieve a high network utilization while providing performance guarante...

In this tutorial paper, we consider the effect of errors in compressed video data, and discuss both standard and more novel techniques for increasing error resilience. We consider the performance of block based coding schemes such as MPEG1, MPEG2, and h.26x when transmitted over noisy channels, a subject of relevance to digital terrestrial television, video communication, mobile digital video, ...

In network delivery of digital video, if the bandwidth required for a video is not available, the video has to be recoded at a reduced bit rate. It is highly desirable that the transcoding is carried out in real time while maintaining reasonable image quality. In this paper, we propose a fast approach to derive from an MPEG stream a new MPEG stream with half the spatial resolution. For the down...

Video broadcasting protocols can improve the efficiency of video on demand services by reducing the bandwidth required to distribute the videos that are simultaneously watched by many viewers While many broadcasting protocols have been proposed, none of them takes into account the fact that the server will broadcast compressed videos whose bandwidth requirements depend on the rate of change of ...

Compressed digital video is one of the most important types of traac in future integrated services networks. It is diicult to support this class of traac since, on one hand, compressed video is bursty, while on the other hand, it requires performance guarantees from the network. The common belief is that we are unlikely to achieve a high network utilization while providing performance guarantee...

The eecient delivery of pre-recorded, compressed video plays an important role in a wide variety of emerging multimedia services. However, compressed video exhibits signiicant bursti-ness that complicates the transmission from the video server, transfer across the communication network, and playback at the client site. By capitalizing on buuer space at the client, the server can reduce transmis...

We investigate video classification via a 3D deep convolutional neural network (CNN) that directly ingests compressed bitstream information. This idea is based on the observation that video macroblock (MB) motion vectors (that are very compact and directly available from the compressed bitstream) are inherently capturing local spatio-temporal changes in each video scene. Our results on two stan...

We present standards-compliant visible watermarking schemes for digital images and video in DCT-based compressed formats. The watermarked data is in the same compressed format as the original and can be viewed with standard tools and applications. Moreover, for most of the schemes presented, the watermarked data has exactly the same compressed size as the original. The watermark can be inserted...