The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In recent years, with the popularity of the running and other sports software, friend recommendation algorithm based on trajectory is gradually becoming a hot research. In this paper, the θ-ADBSCAN algorithm is used to dig the hot trail and the resident points of user's trajectory, then the trajectory segmentation algorithm is described, and the trajectory is replaced by the MTR which is composed...
Cloud-based video encoding has become more and more popular in Internet, especially for mobile clients, considering their limited resources. Recently, GPUs (Graphics Processor Units) make the cloud-based video encoding more economic and efficient. However, the motion estimation in inter prediction, which usually occupies about 70% encoding time in H.264/AVC, is still a big headache because of its...
In this paper, a novel motion estimation (ME) scheme with efficient memory design is presented for the mobile multimedia applications in H.264/AVC. To obtain the optimal memory usage and achieve better coding quality under volatile system operating conditions, we propose a novel bandwidth-rate-distortion (B-R-D) algorithm by exploring the motion activity properties of various video sequences. This...
We present a theoretical framework for the compression of automata, which are widely used representations in speech processing, natural language processing and many other tasks. As a corollary, our framework further covers graph compression. We introduce a probabilistic process of graph and automata generation that is similar to stationary ergodic processes and that covers real-world phenomena. We...
Conditional replenishment algorithm (CRA) was proposed to improve the quality of a hybrid 3DTV system with mixed resolution. Since CRA generates additional information which includes inter-view vectors, it is needed to efficiently encode the information. This paper proposes a method to apply differential pulse code modulation (DPCM) to the inter-view vectors so as to improve the coding efficiency...
A crucial point on the delivery of multicast content over mobile multicast networks is the utilization of Forward Error Correction (FEC) codes on the application layer (AL-FEC) so as to introduce robustness against arbitrary erasures on different recipients without the need of inefficient common error control methods based on data retransmission. FEC is a feedback free error recovery method where...
Application Layer Forward Error Correction (ALFEC) schemes are the most suitable mechanism for error control in mobile multicast services. AL-FEC introduces redundant information in advance with the source data to provide reliability control in the multicast transmission. Due to this fact the introduced redundancy must be carefully selected with respect to the current network conditions to avoid channel...
The recent popularization of hand-held mobile devices, such as smartphones, enables the inter-connectivity among mobile users without the support of Internet infrastructure. When mobile users move and contact each other opportunistically, they form a Delay Tolerant Network (DTN), which can be exploited to share data among them. Data replication is one of the common techniques for such data sharing...
This paper addresses the memory bandwidth problem of motion estimation in resource limited mobile video applications by an integrated bandwidth rate distortion optimization framework. The simulation result shows up to 86% bandwidth saving while keeps equivalent rate-distortion (R-D) performance and meets real time target compared with H.264 reference software for low motion CIF size video. For high...
In this paper, a fast H.264 intra-prediction mode algorithm based on texture characteristic is proposed. Firstly adopt DCT operation on each target block and get the texture direction and variance of the block being coded with the coefficient in frequency domain. And then predict the intra-frame coding mode most accurately with the parameters obtained before. Experiment results show that the PSNR...
Power Quality Problem (PQP) includes several kinds of problems such as harmonics and voltage sag. Locating PQP online can help take countermeasures, and it is very important. With help of mobile agents, PQP can be located with dynamically geographically changed agents. The Power Quality Management System (PQMS) is built on agents, and data transmission is implemented using Person to Person (P2P) and...
The convergence of mobile networks and P2P systems has led to the deployment of a range of schemes for file storage over a network. This paper presents an approach to resilient file management and network storage through the design and implementation of a file dispersal system for a mobile P2P network, based on distributed hash tables (DHT). Inherent issues of security, reliability and efficiency...
In this paper, we present a simple but efficient algorithm for intra prediction mode decision in H.264/AVC. Based on our investigation, the DC mode appears to be the superior prediction mode among various candidates. We propose an intra-mode decision algorithm where the DC mode is chosen as a candidate for the best prediction mode. Our experimental results show that the proposed algorithm saves 80...
An efficient RS encoder for a parity replacer circuit of ATSC M/H mobile DTV receiver is presented. First, we derive the non-systematic RS encoder architecture which requires the well-known Forney algorithm to evaluate the parity symbol values located at arbitrary positions. We notice that only at most three information symbols corresponding to the trellis initialization symbol determine the RS parity...
Multiple reference frames motion estimation is one of the new features introduced in H.264/AVC. Although this new feature improves video coding performance, it is extremely computational intensive. Full search scheme is adopted in reference software JM, and the increased computation load is in proportion to the number of searched reference frames. In this paper, we propose a novel fast multiple reference...
This paper proposes a novel mobile IPv6 header compression algorithm based on the draft RFC4944 issued by IETF. The algorithm improves the compression ratio of the IPv6 header through address assignment and coding arithmetic. The simulation shows that the compression rate can reach to 98.5% which is much better than the method proposed by the draft RFC4944. By taking audio transmission as the example...
Forward error corrections have taken much attention lately due the invention of the patented LT- and Raptor-codes. With these new class of forward error corrections, it is possible to encode and decode data in linear running time. Reed-Solomon however is relatively slow to calculate both on the encoding and decoding side. But Reed-Solomon has it's own benefits: it's free of patents, several implementations...
The synthesis of DHCP has constructed erasure coding, and current trends suggest that the understanding of flip-flop gates will soon emerge. After years of robust research into interrupts, it is shown that the confusing unification of spreadsheets and write-ahead logging are described. Although the discussion might seem counterintuitive, it fell in line with the expectations. It is concluded that...
A cross-layer mechanism for the performance improvement of real-time applications over IEEE 802.16e networks is proposed. The mechanism coordinates i) adaptation capabilities at different layers of the protocol stack, and ii) the handover initiation procedure. It uses information from the physical (PHY) and medium access control (MAC) layers to determine the appropriate burst profile, transmission...
Despite its remarkable coding efficiency, the computational complexity of the spatial-domain intra prediction scheme of H.264 remains a challenging issue especially for applications of the high profile, as it incorporates the additional intra 8times8 prediction mode. To address this issue, we propose in this paper a fast selective intra mode decision algorithm that exploits a newly discovered property...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.