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AN Ping ZHANG Zhao-yang School of Communication Information Engineering Shanghai University Shanghai China 《上海大学学报(英文版)》2000,(Z1)
1 IntroductionAfter many years of relative Obscurity,three-dimensional displays have recently become bothincreasingly pOPular and practical in the computerethics community. One way of shmulating 3Dperception is tO use a stereo paid, tWo images of the same.scene acquired horn different perspectives[']. There is ahigh degree of cross-correlation between the right and leftimages. For stereo images/video, the data cO~ssion isalso necessary, and the coding efficiency can be furtherimproved by ex… 相似文献
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Disparity is the geometrical difference between images of a stereoscopic pair. In this paper, we give a comprehensive analysis of
the statistical characteristics of disparity. Based on experiments, we discuss the relations between disparity, depth and object, relation
between block size and disparity estimation, and the influence of error criteria on disparity estimation. 相似文献
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针对视频中的运动目标离摄像头较近时由于形状的变化而导致目标边界测定不准确的问题,在帧间差分法的基础上,提出了一个求精运动目标边界的算法。先用得到边界值计算目标中心点,再对视频中的运动目标进行运动距离和速度的检测,并在Matlab中进行仿真。实验结果表明,该算法对帧差法的结果进行求精后,得到的运动目标的状态值更接近于实际情况,改进的算法更适合于视频中运动目标形状变化较大的情况下进行运动目标状态的检测。 相似文献
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4-month-old infants were tested for sensitivity to kinetic and binocular information for 3-dimensional-object shape. The study included 2 tests: a test for sensitivity to binocular disparity and a shape perception test. The disparity sensitivity test used a preferential looking procedure developed by Held, Birch, and Gwiazda. On the basis of the results of this test, infants were assigned to disparity-sensitive and disparity-insensitive groups. In the shape perception test, a "transfer-across-depth-cues" method was employed. Infants were habituated to a rotating object whose shape was specified by kinetic information and were then presented with stationary stereograms specifying the same object and a novel-shaped object. The disparity-sensitive infants looked significantly longer at the novel object than at the familiar object, whereas the disparity-insensitive infants showed no difference in looking time to the novel and the familiar objects. The results indicate that disparity-sensitive 4-month-old infants can perceive 3-dimensional-object shape from kinetic and binocular depth information. 相似文献
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论述居民收入差距问题主要表现为个人差距、城乡差距、行业差距和地区之间的差距。差距形成的原因主要有主体差异、社会转型、地域差别、政策因素、监控因素等。探讨解决我国居民收入差距问题的若干对策。 相似文献
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虹膜识别技术是一种非侵犯性的身份鉴别技术.文中探讨了虹膜识别系统,该系统分为虹膜图像的捕获、图像的预处理、特征提取和匹配几大部分;并在此基础上提出了自动虹膜识别算法和虹膜图像的校准技术,最后用基于相位匹配和二维傅里叶变换的幅值差方法来确定虹膜图像的匹配结果.实验证明,该方法运算速度较快,识别效果良好. 相似文献
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Increasing demand is fueling the booming polyurethane industry worldwide. An impeding issue for polyurethane industry is how to handle the large quantity of hydrogen chloride byproduct generated from the synthesis of intermediates, i.e., isocyanates. In the meantime, the traditional chloro-alkaline process suffers both from the high energy intensity of electrolysis method and the disparity in the chlorine and caustic soda market. To solve these problems, the state-of-the-art chlorine recycling technologies are reviewed and compared. Approaches for cost-effective utilization of chlorine in polyurethane industry are investigated. Chinese academies and enterprises’ on-going effort on the development of a novel hydrogen chloride oxidation process for the synthesis of chlorine is presented. With this process, the closed loop recycling of chlorine can be realized. Tremendous economic, environmental and social benefits can be expected. A wide adoption of this technology will significantly advance the sustainable development of polyurethane industry. 相似文献
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SAENGHAENGTHAM Nida KANONGCHAIYOS Pizzanu 《浙江大学学报(A卷英文版)》2006,7(7):1225-1232
INTRODUCTION Collision detection is an important task in many fields such as robotics, computer games, computa- tional geometry (Gottschalk et al., 1996), computer simulation, virtual reality, etc. Most collision detec- tion algorithms work efficiently only with solid and rigid objects, so collision detection between de- formable objects is a challenge. A number of re- searches on non-rigid objects are proposed such as cloth simulation (Bridson et al., 2003; Teschner et al., 2004) and bi… 相似文献
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针对复杂环境下的多目标跟踪问题提出了一种新的跟踪方法．在检测部分,采用第三级离散小波变换和背景差分进行了目标分割．在跟踪部分,首先利用卡尔曼滤波器和缩放因子估计目标在下一帧中的中心位置和矩形框尺寸,然后在中心关联和区域关联的基础上提出了投射率和遮挡率的概念,并结合投射率和遮挡率推断目标行为．最后针对具体目标行为,自适应地调整跟踪方案和卡尔曼参数实现了多目标跟踪．在遮挡情况下利用部分观测调整估计框以获得目标测量值和最优框尺寸．提出的方法对处于遮挡、新出现以及稳定等情况下的运动目标均具有鲁棒的跟踪性能．实验结果表明提出的方法是有效的． 相似文献
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We propose an algorithm of embedding ensemble tracking in a stochastic framework to achieve robust tracking performance under partial occlusion, illumination changes, and abrupt motion. It operates on likelihood images generated by the ensemble method, and combines mean shift and particle filtering in a principled way, where a better proposal distribution is designed by first propagating particles via a motion model, and then running mean shift to move towards their local peaks in the likelihood image. An observation model in the particle filter incorporates global and local information within a region, and an adaptive motion model is adopted to depict the evolution of the object state. The algorithm needs fewer particles to manage the tracking task compared with the general particle filter, and recaptures the object quickly after occlusion occurs. Experiments on two image sequences demonstrate the effectiveness and robustness of the proposed algorithm. 相似文献
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Non-Rigid Medical Image Registration with Joint Histogram Estimation Based on Mutual Information 总被引：1，自引：0，他引：1
A mutual information-based non-rigid medical image registration algorithm is presented. An approximate function of Hanning windowed sinc is used as kernel function of partial volume (PV) interpolation to estimate the joint histogram, which is the key to calculating the mutual information. And a new method is proposed to compute the gradient of mutual information with respect to the model parameters. The transformation of object is modeled by a free-form deformation (FFD) based on B-splines. The experiments on 3D synthetic and real image data show that the algorithm can converge at the global optimum and restrain the emergency of local extreme. 相似文献
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张建华 《重庆职业技术学院学报》2010,19(1):78-81
本文提出了一种二维视频到三维视频的转换方法。采用时域和空域相结合的方法,根据边缘信息．从图像序列中提取运动对象。对二维视频序列来说,其本身并不包含有视差信息,但是可以根据运动信息来估算视差。本文中采用基于三角形网格的浓密视差提取方法来估算。根据双目立体视觉原理和立体显示技术．我们将二维视频帧经过变换,得到伪三维立体视频帧,并合成视频序列。 相似文献
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目前,在WEB架构下,异构信息统一化处理一直是异构信息处理的难题.本文在阐述了领域On-tology理论的基础上,借助于对象化信息对象的描述方法,以异构信息对象化描述为信息概念模型的表达形式,以概念模型的语义关系为异构信息提取规则的内在联系.在WEB上,建立了一种基于RDF异构信息语义的表达方式,借助ONTOLOGY语义逻辑关系,提出了在异构信息集成中一种异构信息的提取规则方法,来满足在异构信息集成中的异构信息的自动处理.本方法在消防档案的WEB架构的系统结构中,处理异构信息提取中得到了应用,取得了良好的实验效果. 相似文献
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利用“两课”教学树立大学生的价值观 总被引：1，自引：0，他引：1
安彩英 《新乡师范高等专科学校学报》2006,20(1):146-148
社会转型时期,大学生的价值观也随之发生着深刻的变化,表现为价值标准和价值类型多元化,价值目标选择实用化,价值实质思考功利化。大学生世界观尚未定型是影响大学生价值观变化的主要原因。因此,要利用“两课”教学,通过多种方式引导和教育大学生树立科学的价值观,从而把他们培养成为合格的人才。 相似文献
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探索了一种研究PVC热稳定剂作用模式的数学方法,所建立的曲线回归方程有效地反映了热稳定剂类型的差异;采用红外光谱研究表明稀土热稳定剂的作用可以改变PVC分子的构象,增加PVC的稳定性。 相似文献
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1 Introduction MPEG 4videocodingstandard providesobject basedfunctionalitiesbyintroducingtheconceptofvideoobject plane (VOP) .Withtheextractionofvideoobjectsandallocatingdifferentnumberofbitsordifferentframe ratesfordifferentobjects ,thestan dardcansupportobject basedscalabilitythatisusefulinmanypracticalapplications[1] .However,MPEG 4alwaysassumesthatthevideocontentstobecodedarewellrepresentedinvideoobjectswithoutmandatinganyspecifictechniques;sovideoobjectsegmentationbecomesanimportant… 相似文献
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This paper proposes a novel registration method for augmented reality (AR) systems based on Oriented FAST and Rotated BRIEF (ORB) and Fast Retina Keypoint (FREAK) natural features. In the proposed ORB-FREAK method, feature extraction is implemented based on the combination of ORB and FREAK, and the feature points are matched using Hamming distance. To get good matching points, cross-checks and least median squares are used to perform outlier filtration, and camera pose is estimated using the matched points. Finally, AR is rendered. Experiments show that the proposed method improves the speed of registration to be in real time; the proposed method can accurately register the target object under the circumstances of partial occlusion of the object; and it also can overcome the effects of rotation, scale change, ambient light and distance. 相似文献
19.
管志斌 《楚雄师范学院学报》2010,25(1):43-50,59
现代汉语“比”字句的句式义是谓词赋予两个同类事物在某一共同属性上呈现量级差异。典型的“比”字句的句法结构是“X比YR”,包括比较主体、比较标记、比较客体和比较结果四个要素,并具有“差比”的语义特征;非典型的“比”字句分别具有“胜过、等同、不及、极比、泛比”等语义特征,并且它们各自在句法结构上与典型的“比”字句都存在一定程度的偏离;句法结构中句法成分的语义性质制约着句式的语义特征。 相似文献
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实现广东区域经济协调发展,重要途径之一就是要通过利用外资来加快广东山区经济发展,缩小地区差距。本文运用理论和实证相结合方法论述了广东山区利用外资的重要意义,并在分析当前山区利用外资制约因素和有利条件的基础上,提出了广东山区利用外资的对策建议。 相似文献