H.264去块效应滤波器的算法设计与电路实现

H.264视频编码标准的去块效应滤波器在改善视频主观质量的同时,也引入了巨大的计算量。为了得到一个高处理能力和低电路规模的去块效应滤波器,提出了一种将对外部存储器的读写操作与滤波计算并行执行的滤波算法,并给出了该算法的电路结构。基于0.18μm的工艺,用Verilog语言对该算法和结构进行了实现,结果表明,综合后电路的关键路径最大时延为7ns,电路规模低于1.65万门,能够以111.7帧/s的帧率对1280×720分辨率的图像进行滤波处理。与现有的设计相比,本设计节省了32.5%的面积,同时提高了79.3%的处理能力。     

基于SIMD技术的可重构去块滤波器结构

由于去块滤波运算数据量庞大的特点以及视频解码实时性的要求,近年来,去块滤波运算的硬件加速器已逐渐成为研究的热点。从兼顾系统的灵活性与性能的角度出发,设计了一种可重构去块滤波器。与传统的支持单一标准的去块滤波硬件加速器相比,该滤波器具有以下优点:实现了一种滤波算法可配置的滤波器结构,从而可以支持多个视频编码标准;采用了基于SIMD单指令多数据流技术,实现滤波数据全并行运算,使硬件高度规整,易于芯片布局布线;设计了1个4级可配置的流水线,重构为不同视频标准的去块滤波器,复用硬件资源,提高了硬件利用率和系统数据吞吐量。用这种架构实现了1个同时支持H.264、AVS、VP8、RealVideo 4种标准的多标准去块滤波加速器,时钟频率为200 MHz,能够用于多标准高清视频的实时滤波处理。     

可配置并行HEVC去块滤波VLSI设计

提出了一种滤波单元数可配置的HEVC去块滤波器VLSI结构。通过对HEVC的去块滤波算法分析,针对滤波块间相互独立进行滤波的特性,设计了滤波单元数可配置的并行结构。该结构将滤波单元设计成基本单元,数量可调节。在提高了吞吐率和计算效率的同时,解决了VLSI设计中面积过大的问题。并设计了转置模块,有效地对数据进行调整,以提高流水线运行效率。在SMIC 0.13μm工艺库下,进行逻辑综合,滤波单元采用4个,系统总门数为59.7K。在时钟频率300MHz下,可处理3840×2160@33fps的视频序列。     

一种高效并行处理结构的H.264去块滤波器

针对H.264视频编码标准中的去块滤波部分提出了一种基于时间的高效并行处理方法。为了降低对存储器的要求,同时提高中间数据的复用效率,采用了一种改进的滤波顺序,使得对外部存储器的读/写操作可以与滤波操作并行执行。另外,由于外部数据的预先载入技术,有效地降低了外部存储器的结构复杂度。与过往技术相比,这种单数据口外部存储结构的去块滤波器单宏块滤波处理周期总数减少了9.6%～74.4%,有效地提高了处理能力。     

一种高效并行处理结构的H.264去块滤波器(英文)

针对H.264视频编码标准中的去块滤波部分提出了一种基于时间的高效并行处理方法。为了降低对存储器的要求,同时提高中间数据的复用效率,采用了一种改进的滤波顺序,使得对外部存储器的读/写操作可以与滤波操作并行执行。另外,由于外部数据的预先载入技术,有效地降低了外部存储器的结构复杂度。与过往技术相比,这种单数据口外部存储结构的去块滤波器单宏块滤波处理周期总数减少了9·6%~74·4%,有效地提高了处理能力。     

H.264编/解码器中去块效应滤波器的实现

环路滤波器是H.264视频编码标准的一个重要选项,在去除编码带来的块效应的过程中起着重要的作用.文章提出一种针对H.264/MPEG-4 AVC标准的高性能低复杂度的去块效应滤波器结构,在此基础上进行仿真实验,实验结果表明,去方块滤波在提高图像质量上效果显著.     

基于局部自相似性的视频图像超分辨率算法

针对视频图像的特点,提出基于局部自相似性的视频图像超分辨率算法.该算法不依赖自然图像数据库作为样本块的图像来源,而是利用局部自相似性,通过在相关坐标邻域中搜索子图像块以实现高频补偿.设计上采样和下采样滤波器,以实现对高频补偿后的图像进行滤波从而产生最终的样本块,采用逐级放大、分多步组合达到视频图像的放大,从而实现了视频图像超分辨率算法.实验结果表明,对于视频序列图像,在主观视觉效果和均方根误差(root mean square error,RMSE)、结构自相似性算子(structural similarity index measurement,SSIM)等方面,算法能显著地提高其分辨率,取得很好的效果.同时,对视频图像利用局部自相似性方法,减少了图像块的检索时间,降低了算法运算量.     

基于快速边界强度判定的H.264去块滤波新算法

在H.264/AVC标准中,去块滤波是提高图像质量和压缩效率有效手段,但其计算复杂度所占时间极大.在整个滤波过程中,边界强度(Bs)的计算复杂度的计算时间几乎占90％,在重点分析H.264的去块滤波的Bs判定准则之后,提出一种基于快速Bs判定的H.264去块滤波优化算法(FF算法).通过实验数据分析,FF算法能够有效地确保视频序列的编解码质量,并比JM中基准算法降低了近50％的Bs判定时间及近20％的滤波时间;与其他改进滤波算法相比也有自身优势,因此,FF算法能够有效地降低去块滤波中的计算复杂度,有助于视频序列实时传输的实现.     

基于自适应非局部均值滤波的图像去块算法

针对传输和存储中原始图像被JPEG和MPEG等标准进行压缩而产生的块效应，提出了一种图像去块算法.该算法选取非局部均值滤波作为框架，并通过机器学习来确定和优化参数，使得非局部均值滤波可以做到自适应处理.结果表明，该算法去块效果优于目前最新的形状自适应滤波法和维纳滤波法.     

基于HEVC的自适应插值滤波算法

为进一步提高自适应分像素插值算法的视频图像质量,降低计算复杂度,提出一种基于HEVC(high efficiency video coding)的自适应插值滤波算法.该算法首先在新一代视频编码标准H.265/HEVC框架下进行编码,以提高视频编码效率;其次通过滤波器系数对称优化,降低码流所需滤波器系数和解码计算的复杂度.复杂度分析结果表明,与其他算法相比,该算法乘法复杂度最高降低229%,加法复杂度最高降低245%.仿真结果表明,与其他算法相比,该算法对不同分辨率视频序列均具有较好的编码性能及鲁棒性.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that