As more and more multimedia content is delivered and stored in the MPEG-2 format, there is an increasing interest in developing processing techniques that can be applied directly to the compressed domain. In applications such as video browsing, picture in picture and in the forthcoming broadcast of high definition digital television (HDTV) to the home there is a need for spatial downscaling of ...

For video transmission over heterogeneous networks and devices, the compressed video stream has to be converted into a lower transmission bit rate or a small spatial resolution. The operation of converting a video in compressed format into another video also in compressed format is called Video Transcoding. The specific transcoding issue mentioned here is referred to as bit rate adaptation or r...

To convert a compressed video sequence to a lowerresolution compressed video, one typically needs to decompress the original sequence, down-sample each frame, and recompress it. It involves motion estimation in the reduced sequence which is computational intensive. In this paper, we propose a novel fast algorithm to predict the motion vector of the reduced video by using the original motion inf...

The main field of this study is digital watermarking of compressed video sequences. The targeted area in the field of digital watermarking is data embedding and indexing, which can be used in applications such as video indexing and retrieval. Having in mind that the content in video databases is mainly compressed and that video retrieval applications

Nowadays, networks and terminals with diverse characteristics of bandwidth and capabilities coexist. To ensure a good quality of experience, this diverse environment demands adaptability of the video stream. In general, video contents are compressed to save storage capacity and to reduce the bandwidth required for its transmission. Therefore, if these compressed video streams were compressed us...

A vast amount of video data is generated around the world every day. Fast and efficient storage, indexing, browsing, and retrieval of video are necessary for the development of various multimedia database applications. Video fingerprinting is a proven and commercially available technique that can be used for content based copy detection. Fingerprints are compact content-based signatures that su...

---In this paper propose a new method for the real-time hiding of information used in compressed video bitstreams. This method is based on the real-time hiding of information in audio steganography. This method of steganography is very similar to the two discussions of image steganography and video steganography. A new compressed video secure steganography(CVSS) algorithm is proposed. In this a...

Publicly available long video traces encoded according to H.264/AVC were analyzed from the fractal and multifractal points of view. It was shown that such video traces, as compressed videos (H.261, H.263, and MPEG-4 Version 2) exhibit inherent longrange dependency, that is, fractal, property. Moreover they have high bit rate variability, particularly at higher compression ratios. Such signals m...

This paper gives an overview of state of the art in algorithms and tools using video and audio features. In particular, we extensively survey the features that can be efficiently extracted from compressed video and audio, which include visual, motion, coding, and audio features. We also discuss typical applications of these compressed-domain features in video and audio indexing and analysis. Fi...

Experience and reasoning occur across multiple temporal scales: milliseconds, seconds, hours or days. The vast majority of computer vision research, however, still focuses on individual images short videos lasting only a few seconds. This is because handling longer require more scalable approaches even to process them. In this work, we propose framework enabling research hour-long with the same...