实时图象伪彩色处理电路的设计与实现

该文研究利用硬件电路实现图象伪彩色处理的方法，突破了传统的图象伪彩色处理必须利用计算机软件的局限。通过对黑白视频信号进行灰度分割和编码，建立起灰度级－彩色的变换关系，即某一灰度级经过变换编码后对应于一个特定的彩色，并且连续的灰度级变化对应于连续的彩色变化，通过彩色编码合成为彩色全电视信号，从而可以直接在彩电上显示出伪彩色图象。该方法线路结构简单，实现了实时伪彩色处理，大大提高了人眼的分辨能力。     

全电视信号实时编码及Walsh Hadamard变换压缩硬件研究

一、前言对于图象编码问题国内外都进行了广泛的探讨,目前着重进行电视信号特别是彩电信号的编码研究。本文对全电视信号实时PCM编码及Walsh-Hadamard变换(WHT)压缩进行了研究。结果表明方案行之有效,它展示了实时变换编码的可喜前景。二、全电视信号PCM装置研究 PCM是电视信号数字化的基本手段。作为A/D,D/A的一种在我国正处在发展阶段,特别是S/H电路尚没有产品。本文提出一种完整的PCM方案,其原理框图如图(1)所示。     

利用模拟梳状滤波器实现彩色全电视信号中的亮度和色度信号分离

本文论述了利用模拟梳状滤波器分离彩色全电视信号中的亮度信号和色度信号的机理和方法。与目前通用的分离方法相比,得出用梳状滤波器进行亮色信号的分离,可以大大降低亮色互串,提高彩色电视图象的清晰度和视频处理系统的信号质量。     

《彩色电视机原理》学习中的两个重要问题

彩色电视机是将多种复杂电子技术综合运用于一体的一种接收机,由于其电路结构和工作原理复杂,初学者往往不得要领,入门困难。笔者认为,学习《彩色电视机原理》应撇开复杂的电路结构,从彩色全电视信号各成分的组成特点及其分离方法和功能框图两个方面入手,方能抓住主线、层层深入。 一、彩色全电视信号组成的主要特点     

用二维重叠数字滤波器再生亚Nyquist取样PAL信号

本文用二维Fourier及Walsh重叠滤波器研究了在1.5-2倍彩色副载频取样时PAL彩色全电视信号的亮度信号及色度信号的再生方法。所选择的取样结构能得到好的再生图象。本文提出了二种亚Nyquist的二维取样结构,在再生离散数字图象时这两种取样结构有相反的误差。引入了理想低通二维Fourier频率和Walsh列率重叠滤波器来再生亚Nyquist取样的图象信号。二维Fourier重叠滤波器消除了在二维Fourier一般滤波器再生图象时出现的边缘Gibbs效应;二维Walsh列率重叠滤波器消除了在二维Walsh一般滤波器再生图象时的锯齿效应。本文详细地介绍了2×2,4×4,8×8,16×16及32×32矩阵的二维Fourier及Walsh重叠滤波器的设计方法及实验结果。实验表明所用重叠滤波器的矩阵越大,再生图象的误差越小,对一般图象8×8矩阵的重叠滤波器就足够用了。在8×8矩阵时对电视测试卡上的少量特殊图形有轻微的失真。     

彩色图象加密存储

用光纤面板对彩色图象取样并压缩成三基色象，写入液晶光阀，用激光读出，然后实现加密全息记录。利用同一装置又要恢复原彩色图象。文章讨论了存储与恢复的原理，给出了实验过程与结论。     

全息图象假彩色编码的一种新方法

介绍使用一步彩虹全息法进行二维图象的假彩色编码。本法只需单波长的激光,装置简单,处理方便,允许用白光光源作假彩色图象再现,并提出简单的实验装置和结果。     

彩色地图分色算法及其实现

研究彩色地图的一种新的图象分色算法．首先将彩色图象通过非线性变换,转换到孟塞尔颜色空间,然后通过色彩学习,进行彩色图象分色．该算法还利用了图象空间相关信息的马尔科夫场模型,可使分色结果得到局部优化,降低了运算量,取得较为理想的效果．     

分层模拟混合式伪彩色显示

到目前为止,已有很多种方式来完成把黑白图象转换成彩色图象的伪彩色显示.本文介绍一种红外电视系统的分层模拟混合式伪彩色显示装置.说明了这种方法的伪彩色显示原理,并分段叙述了伪彩色编码器、温标信号发生器、视频滤波器和层间混色问题.文中还列出了试验结果.     

数码彩扩中提高成像质量的光学方法

使用图象王示器元件LCD构成的数码彩色扩印机,不同于传统的以感光材料为母体的彩色扩印机,它对光学照明系统成像物镜有特殊要求.本文在分析造成照明不均匀原因后提出了一种新的光学装置,不仅提高了像面照度均匀性和三色光(红、绿、蓝)的曝光速度,而且还可根据LCD特点使照片的层次更丰富,彩色扩印的效果更好.     

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