H.264编/解码器中去块效应滤波系统的设计

提出了一种针对H.264/MPEG-4 AVC标准的高性能低复杂度的去块效应滤波系统的VLSI结构,该结构利用数据重用机制以减少数据的吞吐量,同时辅以高效的数据流控制和并行计算.在100MHz的情况下,该结构满足1920×1088@30Hz的高清晰度视频编解码要求.     

H.264编码环中的去块效应滤波系统

介绍了H.264的编解码模型系统中的去块效应滤波系统，分析了该系统原理及其相对于以往去块效应滤波系统的改进。并通过仿真实验验证了该系统在提高图像质量和降低视频流码率上的较好作用。     

H．264／AVC中去块效应滤波器的研究

H．264／AVC是新一代视频编解码标准。它引入了去块效应滤波系统。该系统也是H．264在相对码率较低的情况下依旧能保持较好的主观视觉效果的重要因素之一。本文研究H．264／AVC编解码系统中的去块效应滤波器。分析了该滤波器的滤波原理和过程。并通过实验验证了该滤波器在提高图像质量方面的作用。     

H.264/AVC中去块效应环路滤波的VLSI实现

提出了一种适用于H.264编解码环内去块效应滤波的VLSI结构。利用相邻4×4像素块间数据的依赖关系合理组织数据存储顺序,并通过增加本地SRAM,使垂直滤波数据来自本地,读写外部SDRAM的次数减半,从而大大减少滤波处理的周期数。设置转置寄存器,水平滤波和垂直滤波可共用一维滤波电路。仿真结果显示,一个宏块去块效应滤波仅需要230个周期。在0.18μm工艺下,最大频率100M时,综合逻辑门数为14K。     

面向SOC平台的高效H.264解码架构及实现

提出了一种面向SOC平台的高效H.264解码架,通过解码和去块效应的宏块级流水线化处理,解决了视频流支持灵活的宏块排序(FMO)和任意条带顺序(ASO)技术时码流内的宏块次序与去块效应操作中要求的光栅扫描顺序不同的矛盾,更有利于硬件实现。在硬件设计中,采用cache缓存法暂存用于去块效应的临时数据,同时采用双并行总线满足较高的系统带宽要求。FPGA和SOC的实现结果表明,在系统时钟为166 MHz时,设计结果完全满足1080HD(1920×1088@30 fps)的解码要求。     

一种针对wedgelet重建图像的空域自适应去块效应算法

提出一种针对wedgelet重建图像的空域自适应去块效应算法.算法针对不同图像块之间块效应的强弱程度,合理调整块边缘滤波像素的个数,从而实现自适应地消除块效应.仿真结果表明,该算法在较好地保留了图像的纹理和边缘的同时能有效地去除图像的块效应.     

一种灵活的去块滤波算法

利用对图像的实际边界进行有效的辨别,在原来H.264去块环路滤波的基础上改进算法,可以较好地滤除块效应,使得去块滤波算法可以更加灵活地应用.通过用多种码流测试仿真得出的数据显示,相对于原来的滤波算法峰值信噪比(PSNR)改变较小,主观上图像的视觉效果有较好的改善.     

基于内容预分析的环路滤波算法

传统基于块的视频编码系统,在较低码率情形下进行编码时总会遇到块效应现象.针对H.264中去块滤波中边缘强度判断的高计算复杂度问题,提出了一种基于内容预分析的快速环路滤波算法.该算法在光流方程的基础之上,充分利用帧间的相关性,采用STGS(spatial-temporal gradient scale)图进行不同区域特征的划分,将块效应强度的划分由以像素为单位转化为以块为单位.实验结果表明,该算法大大降低了滤波算法的复杂度,且主观效果与H.264环路滤波系统的结果相当.     

去块效应方法的研究

主要陈述了视频压缩中的去块效应方法,着重介绍了作为后处理模块的去块效应算法,主要包括空域滤波、凸集映射迭代、基于小波变换的频域滤波以及最大后验概率等方法,最后从图像质量、PSNR性能和复杂度等方面分析了算法的优缺点以及适用场合.     

一种快速去块滤波器结构

为了消除由于图象的预测,补偿,变换,量化引起得块效应,H.264/AVC标准中引入了去块滤波器.本文通过采用并行滤波,介绍了一种编解码环中快速实现去块滤波的滤波器结构,分析了该结构的滤波原理以及滤波过程中数据的存储.     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks