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Slice header prediction for depth maps bit reduction
2012 5th International Congress on Image and Signal Processing
Year: 2012 | Conference Paper |
Cited by: Papers (1)
With the 3D Video (3DV) representation of multi-view video plus depth, the 3DV video can be compressed by coding the texture video and depth map independently in current H.264/MVC. This will introduce syntax redundancy between the bitstream of texture video and depth map. To remove the redundancy and improve the coding efficiency of 3D videos, a slice header prediction method is proposed in this p...Show More
Novel 3DV Coding Scheme with Down-/Up-sampling and Asymmetrical Prediction
Xiang Ma;Junyan Huo;Yilin Chang;Guangliang Ren;Ying Chen;Li Zhang
2012 IEEE International Conference on Multimedia and Expo Workshops
Year: 2012 | Conference Paper |
This paper proposes a novel three dimensional video (3DV) coding scheme, in which down-/up-sampling filters and asymmetrical prediction (ASP) are involved into the coding system. By using of the down-/up-sampling filters, the 3DV data volume requirement of the decoding capability limitations can be well satisfied. To further improve the coding efficiency, ASP is proposed which enables the inter-vi...Show More
$k$-Connectivity Analysis of One-Dimensional Linear VANETs
In a 1-D linear vehicular ad hoc network (1-DL-VANET), some vehicles may leave the network (e.g., at highway exits), which may make the 1-DL-VANET disconnected. Thus, it is important to analyze the connectivity of the 1-DL-VANET. When removal of any (k - 1) arbitrary nodes from a network does not disconnect the network, the network is said to be k-connected. In this paper, we investigate the k-con...Show More
Optimal Traffic Scheduling in Vehicular Delay Tolerant Networks
IEEE Communications Letters
Cited by: Papers (18)
In a vehicular delay tolerant network, the problem of scheduling the traffic from a roadside unit to passing-by vehicles is studied. A cost function is associated with a scheduled transmission. And if a delay bound is violated, a penalty cost is charged. The optimal stopping theory is applied to decide when the roadside unit should schedule its accumulated traffic to a passing-by vehicle such that...Show More
Adaptive wiener filter based chrominance up-sampling enhancement method for video coding
In order to improve the quality of the reconstructed video, the Wiener filter is employed in video coding to reduce the distortion caused by chrominance down/up sampling and encoding. Based on the mathematical analysis, it is verified that the distortion introduced by chrominance sampling and coding can be approximately treated as a wide sense stationary noise, which can be suppressed by the Wiene...Show More
A cross-layer algorithm of packet scheduling and resource allocation for multi-user wireless video transmission
This paper investigates the problem of packet scheduling and resource allocation for multi-user wireless video transmission. The problem is first formulated as an optimization problem with the objective of minimizing the reconstructed video distortion of each user under the radio resource constraints. In order to solve the optimization problem, a crosslayer algorithm with low complexity is propose...Show More
Efficient Prediction Structure for Key Pictures in Multiview Video Coding
2011 Symposium on Photonics and Optoelectronics (SOPO)
Year: 2011 | Conference Paper |
Compared to simulcast, the utilization of inter-view prediction at key pictures can dramatically improve the compression efficiency of multiview video coding (MVC). The reconstructed key picture in previous adjacent view is used as the inter-view reference picture of the key picture in the current coding view. The efficiency of inter-view prediction may deteriorate due to the existence of mismatch...Show More
Model-Based Joint Bit Allocation Between Texture Videos and Depth Maps for 3-D Video Coding
In 3-D video coding, texture videos and depth maps need to be jointly coded. The distortion of texture videos and depth maps can be propagated to the synthesized virtual views. Besides coding efficiency of texture videos and depth maps, joint bit allocation between texture videos and depth maps is also an important research issue in 3-D video coding. First, we present comprehensive analyses on the...Show More
Complexity effective cell search scheme for OFDM cellular system
2010 IEEE International Conference on Communication Systems
Year: 2010 | Conference Paper |
Cited by: Papers (5)
A novel cell search scheme based on coherent sequence detection and sign decision is proposed in this paper. The given structure of the SCH (synchronization channel) allows the UE (user equipment) to detect cell ID with low complexity, and the adverse effects of the channel fading and frequency offset are eliminated in the three search steps. The performance of the scheme is investigated in variou...Show More
A novel hierarchical QAM-based unequal error protection scheme for H.264/AVC video over frequency-selective fading channels
A novel unequal error protection (UEP) scheme based on the hierarchical quadrature amplitude modulation (QAM) is proposed for H.264/AVC video transmission over frequency selective fading channels. In order to avoid the situation that data with higher priority in the H.264/AVC video streams to be mapped onto subcarriers in deep fading, an OFDM subcarrier classification strategy with two signal-to-n...Show More
DSR-Based Cross-Layer QoS Design in Ad Hoc Networks
2010 International Conference on Communications and Intelligence Information Security
Year: 2010 | Conference Paper |
Cited by: Papers (2)
Because of limited bandwidth and dynamic topology, it is difficult to provide QoS(Quality of Service) guarantee in ad hoc networks. The aim of the paper is to utilize the wireless resources efficiently and to meet QoS requirements of multimedia applications in ad hoc networks. Here, the model of Policy-based Cross-layer QoS design for Ad hoc Networks is introduced. Then a cross-layer routing proto...Show More
A Generic Framework for Optimal Mobile Sensor Redeployment
Zhong Shen;Yilin Chang;Hai Jiang;Yanling Wang;Zhongjiang Yan
Wireless sensor networks (WSNs) are widely used for various applications. In some applications, it is very likely that the number of sensors is limited, the initial deployment is random, and deployment “holes” (i.e., subareas where there is no sensor) may exist. Therefore, a major challenge in WSNs is to improve the network coverage. A viable solution is to enhance some sensors with mobility capab...Show More
Rate-Distortion Criterion Based Picture Padding for Arbitrary Resolution Video Coding Using H.264/MPEG-4 AVC
The video coding standard H.264/MPEG-4 AVC is designed based on the basic unit of macroblock (MB). In order to support the arbitrary resolution video coding when the picture does not contain an integral number of MBs, the H.264/MPEG-4 AVC encoder usually invokes a picture padding process to extend the boundaries of a picture by adding extra pixels. In this way, the video of an arbitrary resolution...Show More
Quadratic curve based buffer management for H.264/AVC rate control
The 2010 IEEE International Conference on Information and Automation
Year: 2010 | Conference Paper |
Buffer management is an essential element in rate control to regulate the behavior of the virtual output buffer of video encoder. In this paper, a novel quadratic curve based buffer management (QCBM) method for H.264/AVC rate control is proposed. This method considers the features of video coding and employs a quadratic curve, which is obtained according to the initial buffer fullness, target buff...Show More
Model Based Motion Vector Predictor for Zoom Motion
IEEE Signal Processing Letters
Cited by: Papers (27)
As zoom motion is common in video applications, a linear motion model is derived to describe zoom motion based on the analyses of camera imaging principles. Based on the motion model, a motion vector predictor for videos involving zoom motion is proposed. A rate distortion (RD) criterion is used to choose the optimal motion vector predictor between the one utilized in H.264/AVC and the one derived...Show More
Advanced technologies for high-performance video coding
2009 Fourth International Conference on Communications and Networking in China
Year: 2009 | Conference Paper |
The high-performance video coding is activated as a research project of the ISO/IEC Moving Picture Experts Group in the year 2008, and a new standardization is already under discussion and preparation. This paper gives a brief introduction to the development of this project and an overview of the related concepts and technologies. The performance of the described technologies is demonstrated by me...Show More
SNR estimation algorithm based on the preamble for OFDM systems in frequency selective channels
We propose a new SNR estimation method based on the preamble for OFDM systems in frequency selective channels. The OFDM training symbols in the preamble are equalized by the known data in frequency domain and employed to estimate the noise variance. The second order moments of the received symbols are used to estimate the signal plus noise power in the OFDM packets. The SNRs on the subchannels and...Show More
Fine-Granular Motion Matching for Inter-View Motion Skip Mode in Multiview Video Coding
As motion of neighboring views is highly correlated in multiview video systems, the inter-view motion skip mode has been proposed to improve the efficiency of multiview video coding (MVC) by reusing the motion information of neighboring views. To fully exploit the inter-view motion correlation, a fine-granular motion matching algorithm for the motion skip mode is presented in this paper. The propo...Show More
Determining the complexity of FH/SS sequence by approximate entropy
High complexity of frequency-hopping (FH)/spreadspectrum (SS) sequence is of great importance to high-security multiple-access communication systems, for it makes FH/SS sequence difficult to be analyzed. With the growing development in the design of FH/SS sequence in much wider fields, the wellknown complexity measuresiquestthe linear complexity (LC), the linear complexity profile (LCP) and the k-...Show More
A Grid-Scan Localization Algorithm for Wireless Sensor Network
2009 WRI International Conference on Communications and Mobile Computing
Year: 2009 | Conference Paper |
Cited by: Papers (9)
Location estimation is an essential issue for wireless sensor networks (WSN). In this paper a new localization estimation algorithm for WSN is proposed which is based on the Grid-Scan method. In the proposed algorithm, the node collects its 1-hop and 2-hop anchors before the localization algorithm is waked up. Firstly, it obtains the intersection region of the 1-hop anchors' transmission area as t...Show More
A TDOA location scheme in OFDM based WMANs
A time difference of arrival (TDOA) location scheme for the orthogonal frequency division multiplexing (OFDM) based wireless metropolitan area networks (WMANs) is presented. A novel TDOA estimation algorithm for OFDM signals is proposed and adopted in this scheme. The algorithm enhances the location performance by utilizing the information in the time and frequency domains obtained from the receiv...Show More
A Flexible Reference Picture Selection Method for Spatial DIRECT Mode in Multiview Video Coding
2008 Congress on Image and Signal Processing
Year: 2008 | Conference Paper |
The motion information of the macroblock signaled as the spatial DIRECT mode can be derived from the neighboring blocks. The closest reference picture in the reference picture list used by the neighboring blocks is selected as the reference picture of the macroblock. Both temporal and interview reference pictures are put into the reference picture list in order to improve the coding efficiency in ...Show More
A Cross-Layer H.264/AVC Video Transmission Method Over Wireless OFDM
2007 International Workshop on Cross Layer Design
Year: 2007 | Conference Paper |
This paper focuses on the issue of cross-layer control for H.264/AVC video transmission over OFDM. Jointly considering the error resilient (ER) tools provided by H.264/AVC and the characteristics of OFDM channels, a cross-layer scheme is proposed, in which a cross-layer allocator is used to allocate channel resources for different priority video data transmission, and feedback transmission status ...Show More
An Efficient Frequency Offset Estimation Method With a Large Range for Wireless OFDM Systems
An efficient frequency offset estimation method is proposed for wireless orthogonal frequency-division multiplexing (OFDM) systems. In the proposed method, the received samples of the training symbol are processed by a novel envelop equalized processing method, and the estimation of the frequency offset in the OFDM systems turns out to be the frequency estimation of a complex tone. A novel frequen...Show More
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