一种时空权重和边缘自适应的扫描格式转换

为实现隔行扫描到逐行扫描的视频扫描格式转换,提出了一种时空权重和边缘自适应的去隔行算法,主要包括运动估计、小角度边缘搜索、时空权重计算、自适应插值等。该算法通过4场相邻像素的最大灰度变化与运动阈值比较实现对当前像素的运动估计,采用自适应搜索半径和并行搜索树的方法实现小角度边缘检测,并且增加对半像素边缘的考虑实现最小6°边缘的检测,最后通过时空权重自适应的插值算法实现去隔行处理,取得很好的处理效果。     

亚高原地区弹射救生控制技术研究

为实现隔行扫描到逐行扫描的视频扫描格式转换,提出了一种时空权重和边缘自适应的去隔行算法,主要包括运动估计、小角度边缘搜索、时空权重计算、自适应插值等。该算法通过4场相邻像素的最大灰度变化与运动阈值比较实现对当前像素的运动估计,采用自适应搜索半径和并行搜索树的方法实现小角度边缘检测,并且增加对半像素边缘的考虑实现最小6°边缘的检测,最后通过时空权重自适应的插值算法实现去隔行处理,取得很好的处理效果。     

HSV空间中基于区域边缘直方图的视频目标再识别算法

视频目标再识别涉及计算机视觉领域的运动目标检测、跟踪、图像处理、特征提取、特征匹配等.现提出一种基于前景检测、彩色区域边缘直方图(REH)的视频目标再识别算法.前景目标检测能有效消除背景像素产生的冗余特征,结合HSV空间中的彩色区域边缘直方图,增强了对目标的特征描述.实验在笔者建立数据集和3Dpes上取得了86.7%和51.5%的识别率,进一步提高了视频目标再识别的准确率.     

数字电视中视频芯片的自适应去隔行算法研究

文章提出了一种适用于数字电视视频处理芯片上的隔行——逐行格式转换算法。该算法能正确检测出视频的运动和静止信息,从而自适应的采用帧内边缘相关算法或者帧间交织算法进行隔行到逐行的格式转换;并且能准确的检测出并转换具有3-2下拉特征的电影模式视频序列。经仿真验证,该算法与其他算法相比具有占用系统资源少、运算速度快的优点,因此非常适合应用在视频处理芯片中。     

区域边缘直方图的目标搜索算法

视频目标搜索是智能视频监控领域一大挑战,提出一种基于灰度图像区域边缘直方图的目标搜索算法.首先,在固定场景的视频数据中,对选定目标进行特征提取,即区域边缘直方图(REH)特征向量;接着在同一场景的未知视频数据中进行前景检测并提取前景目标的特征向量;经滤波处理后,与选定目标特征向量进行匹配,通过相似性度量评判是否搜索成功.实验得到了最佳72.4%的匹配成功率,验证了32维的区域边缘特征向量为最佳描述特征.实验结果表明,本算法能有效地实现目标搜索.     

基于边缘检测的视频字幕自动定位方法

视频中的字幕蕴含丰富的语义信息,字幕检测方法对视频检索就尤为重。因此,提出了一种高效率的方法对视频中的字幕完成自动检测与定位。对输入的图像进行锐化预处理,突出字幕区域的信息,求取经锐化处理后图像的最佳分割阀值,结合最佳分割阀值进行边缘检测得到二值图,很好的分离了字幕区域与背景区域。运用形态学处理使文字连接成块,最后依据文字的先验特征去除干扰区域。实验证明,该方法复杂程度低,能准确的定位字幕区域。     

基于二阶平滑先验的图像保边平滑快速算法

研究了计算机图形处理与计算视觉处理中的图像保边平滑（保持图像边缘平滑）处理。考虑到基于优化方法的保边平滑算法多使用一阶平滑先验作为能量函数的正则项,但它会使平滑结果产生阶梯状的平滑效果,提出了一种基于二阶平滑先验的保边平滑算法,该算法能够避免一阶平滑先验存在的阶梯状平滑偏差,同时锋利地保持图像中显著的边缘。针对该算法的连续变量与01变量的混合优化问题,使用了一种快速的求解方法,该方法在使用图形处理器（GPU）并行加速的情况下能够快速获取平滑结果。通过实验验证了该算法在深度图保边平滑处理、JPEG卡通图像压缩瑕疵恢复以及边缘提取问题中的应用效果。     

基于运动时空相关度的时域误码掩盖算法

针对视频通信中时域误码掩盖中运动矢量恢复存在偏差的问题,提出了一种依据相似三角形特点的运动矢量估算方法。同时,利用受损块与前续块、邻域块的运动的时空相关性,提出了一种基于运动时空相关度的时域掩盖算法:对于受损块,采用提出的相似三角形运动矢量估算法和拉格朗日插值法分别估算其运动时域相关和运动空域相关的运动矢量,然后评估受损块的运动时空相关度,据此对估算的运动时域和运动空域相关的运动矢量进行加权平均以得到最终掩盖的运动矢量,从而实现受损块的时域掩盖。仿真结果表明,对不同宏块丢失率或不同视频序列,该算法均可比传统算法恢复出更高质量的图像。     

基于跨时空域相似邻接图的视频分割算法

视频分割是视频处理领域的基本问题,也是该领域的研究前沿和热点问题之一,在视频监控、编辑合成等方面都有着重要的应用。传统的视频分割方法大多依赖帧间局部相似性或运动的连续性进行区域划分,对遮挡、大幅度运动等情况的分割效果较差,需要大量的手工交互。论文通过在视频空间建立跨时空域的相似性邻接关系,提出一种新的视频分割图分割模型,并且采用最大流/最小割算法对相应的模型进行快速求解,从而实现视频的有效分割。论文算法只需要用户在视频的关键帧图像上进行少量交互,便自动获取整个视频分割结果;并且,该分割过程不受前景对象遮挡、快速运动等情况的影响,具有很好的稳定性。     

增强彩色电子纸饱和度的误差扩散优化

为解决彩色电泳电子纸因粘滞阻力等引起的显示颜色饱和度低、边缘模糊等问题,本文提出基于HSL空间的彩色电子纸边缘增强误差扩散算法,以提高图像显示质量。该算法首先将去噪图像利用边缘检测算子得到边缘增强图像,结合边缘增强图像像素邻域平均灰度、像素与邻域灰度差异和像素邻域相似度得到新RGB图像像素值。接着,新RGB图像通过阈值处理过程得到16色阶RGB图像。最后,16色阶RGB图像转换到HSL空间,建立HSL和RGB色彩空间的转换模型,根据像素点的亮度和饱和度计算出调整因子,从而增强RGB图像饱和度。该算法与传统的误差扩散算法相比,信噪比PSNR提高了3.9%～26.7%,UCIQE提高了10.1%～48.2%,相似度SSIM提高了13.2%～25.4%。主观评价参考ITU-R BT.500-1标准设计实验计算Z得分,最终本文算法处理后图像在彩色电子纸上显示的图像细节和颜色更加接近原图,整体视觉效果更好。     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

The Research of Anti-Wear Properties of Organomolybdenum Compounds in the Engine Oils

A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils.     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

A study of centrifugal cast high boron high speed steel

In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M₂(B,C), (W,Mo)₂(B,C), M₃(B,C), M₂₃(B,C)₆ type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm². The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K₁ mill housing of bar mill.     

Certification Becomes Important for the I Quality; and Safety Supervision of the Chinese Liquor Sector

The end of 2007, over 200 unit products of more than 80 Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits, beer, wine, yellow wine, fruit syrup wine and others, and cover over 80% of the national top-branded liquor products.……     

Deposition and Coating Properties on CVD Tungsten

Surface characterization and microstructure studies are performed on chemical vapor deposited (CVD) tungsten coating. There is about 2 μm thickness diffusion layer of tungsten in the molybdenum substrate. The thermal shock test shows tungsten coating has good adhesion with molybdenum substrate, but the elements of oxygen and carbon in the tungsten coating have the bad affection to the adhesion. The result of high-temperature diffusion experiment is the diffusion rate from molybdenum substrate to tungsten coating is faster.