JPEG2000静态图像压缩标准

图像压缩技术在多媒体技术领域占有重要位置.本文着重介绍了静态图像压缩的国际标准:JPEG和JPEG2000;通过对这两种压缩标准的比较,指出JPEG2000的优越性.     

一种基于DSP的JPEG2000视频压缩系统的实现

JPEG2000是国际标准化组织ISO和国际电信联盟ITU T共同制定的新一代图像压缩标准.它是基于EB COT算法,使用DWT,采用两层编码策略, 能够获得较好的压缩率.介绍了JPEG2000的基本特点,概述了其图像编码系统.详细描述基于DSP的JPEG2000硬件压缩系统各个硬件的选择以及具体的实现过程.     

基于提升小波变换的医学图像压缩算法

详细分析小波提升框架算法(L ifting Schem e)的原理和实现步骤,比较了M allat算法和L ifting Schem e算法在运行速度上的差异.推导出JPEG 2000静态图像压缩标准所采用的Le Gall 5/3小波滤波器的提升格式,对Le Gall 5/3小波和CDF 9/7小波滤波器的提升格式应用于医学图像压缩编码进行了分析.本文给出的小波提升算法对JPEG2000静态图象压缩标准在医学影像存储与传输系统中的应用具有参考价值.     

浅谈图像压缩编码技术JPEG2000

JPEG2000是新一代的静态图像压缩标准,它具有优良的压缩性能,及很多JPEG无法提供的新功能。本文阐述了JPEG2000图像压缩的实现过程,对其中的关键技术——小波变换、熵编码做了详细的描述,并简述了JPEG2000的性能特点。     

JPEG2000的编码原理及其优缺点

为了满足人们对图像压缩技术提出的更高要求,国际标准化祖师(ISO)指定了新一代静止图像压缩:JPEG2000。阐述了JPEG2000图像编码系统的算法原理——小波变换,在与 JPEG 标准比较的基础上,分析了 JPEG2000算法的优缺点并给出适用 JPEG2000的几种情况,最后对 JPEG2000未来进行展望。     

零树小波与分形图像编码算法相结合实现JPEG2000压缩

讨论了基于零树小波图像压缩的编码算法机理，在零树小波与分形图像编码相结合下实现的JPEG2000静态图像压缩，并对JPEG2000与JPEG效果图像的测试实验结果进行了比较，最后对基于小波变换的图像压缩应用提出了其主要发展方向。     

静态压缩图像标准JPEG的研究

静止图像压缩技术一直是信号处理方面的一个重要课题,本文首先研究了JPEG2000静态图像标准的特点、原理、格式和编码过程,重点对离散小波变换、速率控制算法、渐进传输特性、感兴趣区域压缩等关键技术进行了分析,讨论了JPEG2000图像压缩过程,最后对JPEG2000的发展与展望作了总结.     

一种基于DSP的静态图像通信系统设计

首先对系统采用的JPEG2000图像压缩算法作简要介绍，然后详细分析图像通信系统的硬件和软件设计，最后提出两套图像通信的实现方案，由于采用具有自适应能力的JPEG2000软件算法和灵活可变的：FPGA、高速DSP硬件组合设计，系统易于升级，适用于对图像具有不同要求的大多数场合。     

基于提升小波变换的JPEG 2000核心算法研究

JPEG2000是新一代静态图像压缩标准,它具有优良的压缩性能和很高的灵活性。介绍了JPEG2000的编码流程,研究了它的核心算法,重点分析了JPEG2000所采用的提升小波变换。并得出JPEG2000与传统的图像压缩标准相比确实具有更加优越的性能的结论。     

JPEG2000标准下图像压缩性能研究

从理论角度详述小波基的基本特性,讨论了小波基对数字图像压缩性能的影响,总结出适合图像压缩的小波基应具有的性质.在详细分析JPEG 2000标准小波基的基础上,进行了JPEG 2000压缩效果和压缩时间实验,结果表明相同压缩比下,采用D 5/3小波基进行压缩的时间要比D 9/7小波基的压缩时间少将近20%.     

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.     

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     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with