This document describes the VP8 compressed video data format, together with a discussion of the decoding procedure for the format.

domain has become an important task as growing quantities of multimedia (MM) digital content are available in this form. In this paper we present a method for fast indexing of camera motion of MPEG1 and 2 compressed video. We use P-frame motion vectors and extract some knowledge on the quality of the compensated motion from the compressed stream. It is then used for decision making on the motio...

Scene change detection plays an important role in a number of video applications, including video indexing, searching, browsing, semantic features extraction, and, in general, pre-processing and post-processing operations. Several scene change detection methods have been proposed in different coding standards. Most of them use fixed thresholds for the similarity metrics to determine if there wa...

In this paper, a novel technique for shot boundary detection operating on H.264/AVC-compressed sequences is presented. Due to new and improved coding tools in H.264/AVC, the characteristics of the obtained sequences differ from former video coding standards. Although several algorithms working on this new standard are already proposed, the presence of IDR frames can still lead to a low accuracy...

We propose a fast, yet simple algorithm to find the Region of Interest (ROI) from a compressed MPEG video bitstream, with partial decoding. We have used the properties of the Human Visual System (HVS), applied in the DCT domain, to extract the ROIs. Though a lot of work has been done to obtain ROIs in images based on the HVS, all these systems work in the pixel domain. However, finding the ROIs...

is report describes an implementation ofDXTcompression inUltraGrid, allowing for low latency, high denition multi-party videoconferencing requiring only 250Mbps of bandwidth. is represents a substantial decrease compared to the uncompressed video stream, which requires 1.5Gbps, while having a minimal impact on latency. e DXT implementation includes a new client-side display which, when using D...

This paper proposes an efficient video stream switching scheme among compressed video streams coded at different quality levels and bit rates. The conventional stream switching scheme in H2.64/AVC is effective in switching, but degrades the compression efficiency of the transmitted stream even if the switching operation does not take place. In the proposed scheme, no modification is made to the...

Yang, Jinwha. Ph.D., Purdue University, May, 2004. A Study of Error-Resilient Interleaving with Applications in the Transmission of Compressed Images and Video. Major Professor: Edward J. Delp. Three interleaving algorithms are developed and evaluated to improve the quality of compressed images or video delivered over error-prone channels. The algorithms operate on macroblocks (MB), the multipl...

Selective encryption is a technique that is used to minimize computational complexity or enable system functionality by only encrypting a portion of a compressed bitstream while still achieving reasonable security. For selective encryption to work, we need to rely not only on the beneficial effects of redundancy reduction, but also on the characteristics of the compression algorithm to concentr...

This paper addresses the problem of the insertion of irregular-shaped objects, such as logos or subtitles, in video signals in the compressed DCT domain. To achieve this objective, a different approach from the usual pixel domain compositing operation is adopted, in order to avoid the presence of undesired semi-transparent regions around the inserted objects. The transposition of this technique...