Video streaming over wireless network is challenging due to node mobility and high channel error rate. In this paper, we propose a joint server/peer, proxy-driven video streaming architecture to support high quality video streaming service over IEEE 802.11-based wireless networks. The video proxy tracks peer mobility pattern, coordinates among multiple senders and performs rate-distortion optim...

Motion estimation and compensation is an essential part of existing video coding systems. The mesh-based motion estimation (MME) produces smoother motion field, better subjective quality (free from blocking artifacts), and higher peak signal-to-noise ratio (PSNR) in many cases, especially at low bitrate video communications, compared to the conventional block matching algorithm (BMA). Howev...

In this paper, we investigate mechanisms for the video streaming system where proxies cooperate to provide users with low-latency and high-quality services under heterogeneous and mobile environment where hosts have different capabilities and dynamically change their locations. The proxy is capable of adapting incoming or cached video data to user’s demand by means of transcoders and filters. W...

Today power consumption is considered to be one of the important issues. Therefore, its reduction plays a considerable role in developing systems. Previous studies have shown that approximately 50% of total power consumption is used in cache memories. There is a direct relationship between power consumption and replacement quantity made in cache. The less the number of replacements is, the less...

In this paper we proposes a cache consistency scheme based on a previously proposed architecture for caching database data in MANETs. The original scheme for data caching stores the queries that are submitted by requesting nodes in special nodes, called query directories (QDs), and uses these queries to locate the data (responses) that are stored in the nodes that requested them, called caching...

VoD System is a system that transfers enormous amount of video data, its important task is to save the video and decrease the load of VoD Server that processes the client’s request. When the users use VoD Service, getting the simultaneous and continuous service is important, and providing the user’s interactivity such as VCR becomes one of the study area of VoD system. In this paper, MCVoD (Vid...

Motion compensation is widely used in many video coding standards. Due to its bandwidth requirement and complexity, motion compensation is one of the most challenging parts in the design of high definition video decoder. In this paper, we propose a high performance and low bandwidth motion compensation design, which supports H.264/AVC, MPEG-1/2 and Chinese AVS standards. We introduce a 2-Dimens...