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Mesh-Based Network Convergence and Cooperation
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作者 Tian Feng,Yang Zhen(Nanjing University of Posts and Telecommunications,Nanjing 210003,China) 《ZTE Communications》 2008年第3期14-19,共6页
More and more distinctive heterogeneous features are exhibited in wireless networks in multitude of networks, technologies, terminals, operation and management, and more. Effective convergence and cooperation of heter... More and more distinctive heterogeneous features are exhibited in wireless networks in multitude of networks, technologies, terminals, operation and management, and more. Effective convergence and cooperation of heterogeneous networks can be achieved through Mesh technology. The IP-based convergence integrates common features of heterogeneous networks, while the cooperation coordinates personalities of the networks. By using the convergence and cooperation, a standardized integration of separated and localized predominant capabilities and resources of heterogeneous networks can be fulfilled to enable the evolution into an ubiquitous and omnipotent intelligent network. 展开更多
关键词 mesh-based Network Convergence and Cooperation WMN WIMAX
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Complete Multiple Description Mesh-Based Video Coding Scheme and Its Performance
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作者 Yang-LiWang Cheng-KeWu 《Journal of Computer Science & Technology》 SCIE EI CSCD 2005年第3期426-431,共6页
This paper proposes a multiple description (MD) mesh-based motion coding method, which generates two descriptions for mesh-based motion by subsampling the nodes of a right-angled triangular mesh and dividing them into... This paper proposes a multiple description (MD) mesh-based motion coding method, which generates two descriptions for mesh-based motion by subsampling the nodes of a right-angled triangular mesh and dividing them into two groups. Motion vectors associated with the mesh nodes in each group are transmitted over distinct channels. With the nodes in each group, two other regular triangular meshes besides the original one can be constructed, and three different prediction images can be reconstructed according to descriptions available. The proposed MD mesh-based motion coding method is then combined with the pairwise correlating transform (PCT), and a complete MD video coding scheme is proposed. Further measures are taken to reduce the mismatch between the encoder and decoder that occurs when only one description is received and the decoder reconstruction is different from the encoder. The performance of the proposed scheme is evaluated using computer simulations, and the results show, compared to Reibman's MD transform coding (MDTC) method, the proposed scheme achieves better redundancy rate distortion (RRD) performance. In packet loss scenario, the proposed scheme outperforms the MDTC method. 展开更多
关键词 multiple description coding mesh-based motion compensation redundancy rate distortion packet loss
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深贯穿问题脉冲高度计数减方差技巧 被引量:10
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作者 李长楷 汤晓斌 岳爱忠 《核技术》 CAS CSCD 北大核心 2015年第3期52-58,共7页
在处理核测井、辐射防护以及核医学等深贯穿问题时简单使用无偏方法会导致计算时间长且误差大。较新版本的MCNP程序在进行脉冲高度计数时可使用多种减方差技巧。本文使用蒙特卡罗程序代码MCNP5 1.51对包括Mesh-based权窗在内的多种减方... 在处理核测井、辐射防护以及核医学等深贯穿问题时简单使用无偏方法会导致计算时间长且误差大。较新版本的MCNP程序在进行脉冲高度计数时可使用多种减方差技巧。本文使用蒙特卡罗程序代码MCNP5 1.51对包括Mesh-based权窗在内的多种减方差技巧的计算效率进行测试研究,旨在寻求较好的脉冲高度减方差技巧(Pulse height variance reduction techniques,PHVRT)来解决深贯穿问题中计数效率低的问题。计算表明使用DX球配合强迫碰撞生成的权窗可大幅提高计算效率,对各参数进行优化后又可进一步大幅度提高计算效率。最终得出使用Mesh-based权窗配合其他减方差技巧可以很好解决深贯穿问题计算效率低问题。 展开更多
关键词 深贯穿 脉冲高度计数 减方差 mesh-based权窗
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Multiquadric Radial Basis Function Approximation Scheme for Solution of Total Variation Based Multiplicative Noise Removal Model 被引量:1
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作者 Mushtaq Ahmad Khan Ahmed BAltamimi +4 位作者 Zawar Hussain Khan Khurram Shehzad Khattak Sahib Khan Asmat Ullah Murtaza Ali 《Computer Modeling in Engineering & Sciences》 SCIE EI 2021年第1期55-88,共34页
This article introduces a fastmeshless algorithm for the numerical solution nonlinear partial differential equations(PDE)by Radial Basis Functions(RBFs)approximation connected with the Total Variation(TV)-basedminimiz... This article introduces a fastmeshless algorithm for the numerical solution nonlinear partial differential equations(PDE)by Radial Basis Functions(RBFs)approximation connected with the Total Variation(TV)-basedminimization functional and to show its application to image denoising containing multiplicative noise.These capabilities used within the proposed algorithm have not only the quality of image denoising,edge preservation but also the property of minimization of staircase effect which results in blocky effects in the images.It is worth mentioning that the recommended method can be easily employed for nonlinear problems due to the lack of dependence on a mesh or integration procedure.The numerical investigations and corresponding examples prove the effectiveness of the recommended algorithm regarding the robustness and visual improvement as well as peak-signal-to-noise ratio(PSNR),signal-to-noise ratio(SNR),and structural similarity index(SSIM)corresponded to the current conventional TV-based schemes. 展开更多
关键词 Denoised image multiplicative and speckle noises total variation(TV)filter Euler-Lagrange restoration equation multiquadric radial basis functions meshless and mesh-based schemes
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Point Selection for Triangular 2-D Mesh Design Using Adaptive Forward Tracking Algorithm
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作者 Nastaran Borjian Rassoul Amirfattahi Saeed Sadri 《Positioning》 2011年第1期22-35,共14页
Two-dimensional mesh-based motion tracking preserves neighboring relations (through connectivity of the mesh) and also allows warping transformations between pairs of frames;thus, it effectively eliminates blocking ar... Two-dimensional mesh-based motion tracking preserves neighboring relations (through connectivity of the mesh) and also allows warping transformations between pairs of frames;thus, it effectively eliminates blocking artifacts that are common in motion compensation by block matching. However, available uniform 2-D mesh model enforces connec-tivity everywhere within a frame, which is clearly not suitable across occlusion boundaries. To overcome this limitation, BTBC (background to be covered) detection and MF (model failure) detection algorithms are being used. In this algorithm, connectivity of the mesh elements (patches) across covered and uncovered region boundaries are broken. This is achieved by allowing no node points within the background to be covered and refining the mesh structure within the model failure region at each frame. We modify the occlusion-adaptive, content-based mesh design and forward tracking algorithm used by Yucel Altunbasak for selection of points for triangular 2-D mesh design. Then, we propose a new triangulation procedure for mesh structure and also a new algorithm to justify connectivity of mesh structure after motion vector estimation of the mesh points. The modified content-based mesh is adaptive which eliminates the necessity of transmission of all node locations at each frame. 展开更多
关键词 Motion Estimation Optical Flow Pixel-Based Block-Based-Region-Based mesh-based Adap-tive-Forward Tracking POLYGON Approximation CONTENT-BASED MESH Structure TRIANGULATION AFFINE Compensation MESH Refinement.
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