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作者： Shen, Liquan Zhang, Zhaoyang Shanghai University Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai 200072 China

Block sizes larger than the traditional 16×16 macroblock (MB) structure and extended macroblock (EMB) size motion estimation (ME) are introduced in joint model key technology areas software to improve the inter block coding efficiency. Similar to H.264, variable size motion estimation (VS-ME) is still adopted for each 16×16 MB including 16×16, 16×8, 8×16, 8×8, 8×4, 4×8, and 4×4. EMB size ME and VS-ME achieve the highest possible coding efficiency, but result in extremely large coding time which obstructs it from practical use. A fast mode decision algorithm for EMBs based on motion homogeneity is proposed to reduce the computational complexity of ME. The basic idea of the proposed method is to utilize the spatial property of motion field in prediction where EMB size ME and small size ME (including 8×8, 8×4, 4×8 and 4×4) are needed, and only in these regions EMB size ME and small size ME are enabled. The motion field is generated by the corresponding motion vectors in spatial window. Simulation results show that the proposed algorithm can save 55% average computational complexity, with negligible loss of coding efficiency. © 2012 SPIE and IS&T.

关键词： Motion estimation

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Unsupervised motion detection with background update and shadow suppression

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控制理论与应用（英文版） 2012年第4期10卷 517-522页

作者： Yepeng GUAN School of Communication and Information Engineering Shanghai University Key Laboratory of Advanced Displays and System Application Ministry of Education

An algorithm is developed to detect moving object and suppress shadow. According to motion variations caused by some moving objects in a scene, a background update approach is proposed. The developed update method ef- ficiently prevents undesired corruption of background and does not consider the adaptation coefficient or the learning rate used in some existing algorithms. A multi-scale wavelet transform methodology is used to segment foreground from a clut- ter background. The optimal selection of threshold value is automatically determined which does not require any complex supervised training or manual calibration. According to photometric invariant, a color ratio difference is proposed to sup- press shadow. Some complete foreground motion object regions are extracted by integrating moving object segmentation in the multi-scale wavelet with shadow suppression in the color ratio difference. The mentioned method is less affected by the presence of moving objects in a scene. Experimental results show that the proposed approach is efficient in detecting motion objects and suppressing shadows by comparisons.

关键词： Moving objects segmentation Shadow elimination Color ratio Multi-scale wavelet transformation

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Mechanical properties of a novel nano-thermal interface material

Mechanical properties of a novel nano-thermal interface mate...

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IEEE Conference on Nanotechnology

作者： Wanli Peng Carl Zandén Lilei Ye Xiuzhen Lu Johan Liu Key Laboratory of Advanced Display and System Applications Shanghai University Shanghai P. R. China Department of Microtechnology and Nanoscience Chalmers University of Technology Gothenburg Sweden SHT Smart High Tech AB Gothenburg Sweden

ISBN: (纸本)9781479910267

Continued miniaturization in combination with increased performance in microelectronics has generated an urgent need for improved thermal management techniques in order to maintain reliability in systems and devices. Thermal interface materials play a key role in the development of solutions for thermal management in microelectronics. In this paper, mechanical properties of a nanotechnology enhanced thermal interface material (Nano-TIM) were studied. The material is based on Sn-Ag-Cu based alloy reinforced with nano scale fiber matrix. Tensile tests were used to investigate and compare the elastic modulus at room temperature and mechanical strength between 20 to 100°C. Scanning Electron Microscopy (SEM) analysis techniques were used to investigate the morphology of the fracture section after tensile tests as well as the internal structure of the samples. The results show that the Nano-TIM can have a significantly lower elastic modulus compared to the pure alloy phase of SnAgCu due to its fiber phase. A lower elastic modulus of the solder joint can be important since it will reduce the stress transfer across the interface. This is particular important when the joint substrates have mismatching coefficients of thermal expansion. The findings of this study thus indicate that the Nano-TIM may provide a useful alternative to improve the thermomechanical reliability compared to pure solder joints.

关键词： Materials Metals Thermal conductivity Thermal management Optical fiber testing Stress Electronic packaging thermal management

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Experimental Measurements for Mechanical and Electrical Conductive Properties of CNT Bundles

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Sixth International Conference on Nonlinear Mechanics

作者： Yan Zhang Ying-jie Zhou Jing-yu Fan Johan Liu Key Laboratory of Advanced Display and System Applications Ministry of Education & SMIT CenterSchool of Mechatronics Engineering and AutomationShanghai University Shanghai Institute of Applied Mathematics and Mechanics Shanghai University BNSL Department of Microtechnology and NanoscienceChalmers University of Technology

ISBN: (纸本)9781605951096;1605951099

＜正＞With the miniaturization and multifunction trend in consumer electronics and other numerous applications,the characteristic sizes of chips,components and devices become smaller and smaller while the power dissipation and the associated heat flux density increase *** nanotube（CNT） has become a promising material due to its mechanical and conductive *** this paper, the CNT bundles on silicon chip have been experimentally investigated with respect to both the mechanical behavior under loading and the electrical conductivity as flip-chip interconnects.

关键词： Power dissipation conductivity Mechanical Testing and Measurement ELECTROMECHANICAL Bundles consumer electronics miniaturization Mechanical properties heat flux density Appliances center-notch tensile specimen Electric conductivity loading LOADING

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Hardware solution of real-time depth estimation based on stereo vision

Hardware solution of real-time depth estimation based on ste...

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2012 3rd IEEE/IET International Conference on Audio, Language and Image Processing, ICALIP 2012

作者： Li, He-Jian Teng, Guo-Wei Zhang, Zhao-Yang An, Ping Ma, Ran Wang, Jian-Wei Wu, Fu-Qiong Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai 20072 China School of Communication and Information Engineering Shanghai University Shanghai 200072 China

ISBN: (纸本)9781467301718

3D video representation with depth maps is one efficient framework of 3DTV/free viewpoint television (FTV). 3D effect can be reconstructed based on human visional principle of binocular disparity. Texture image plus depth map provides an efficient solution of 3DTV application and real-time depth estimation is one barrier due to huge processing time consumption on complexity algorithm in the processing. An efficient hardware implementation of depth estimation is proposed for real time execution in this paper. The estimation system includes dual-channel video capture, image preprocessing, density pixel matching, pixel correlation and post processing. Each step of the system takes advantage of the hardware resource and adopts pipeline architecture to reduce the latency of combinational logic module at every stage and increase the throughput of the disparity extraction module. Experimental results demonstrate that the proposed method reduces the processing time and improves the ability of high resolution processing. The system can reach 131fps and Full HD (1920x1080) resolution, is suitable for adaptive real-time depth estimation and can be used as a subsystem embedded in the capture system of stereo vision. © 2012 IEEE.

关键词： Stereo vision

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Multi-view image rectification algorithm based on controlled zero-parallax plane

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Jilin Daxue Xuebao (Gongxueban)/Journal of Jilin University (Engineering and Technology Edition) 2013年第SUPPL.1期43卷 299-303页

作者： Cheng, Hao An, Ping Li, He-Jian Wang, Kui Zhang, Zhao-Yang Key Laboratory of Advanced Displays and System Application Ministry of Education Shanghai 200072 China School of Communication and Information Engineering Shanghai University Shanghai 200072 China

A parallax-controlled multi-view image rectification algorithm was introduced. Through rotating, vertical parallax adjustment and parallax balance, the information of multi-view image could be rectified. The stereo image could meet the requirements of multi-view stereoscopic display. The object could be displayed with plus, minus and zero parallax. Experiments show that the rectified stereo images can be displayed on the multi-view stereoscopic display with excellent stereo perception, and the target object can be outstanding, sunken or on the screen on demand.

关键词： Stereo image processing

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Effects of substrate temperature on the properties of silicon oxide films by PECVD

Effects of substrate temperature on the properties of silico...

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2012 International Applied Mechanics, MechatronicsAutomation and system Simulation Meeting, AMMASS 2012

作者： Li, Chunya Li, Xifeng Chen, Longlong Shi, Jifeng Zhang, Jianhua Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University Shanghai 200072 China

Under different growth conditions, silicon Oxide (SiOx) thin films were deposited successfully on Si (100) substrates and glass substrates by plasma enhanced chemical vapor deposition (PECVD). The thickness, refractive index and growth rate of the thin films were tested by ellipsometer. The effects of deposition temperature on the structure and properties of SiOx films were studied using X ray diffraction (XRD), X ray photoelectron spectroscopy (XPS) and UV-Visible spectroscopy. The results show that the SiOx films were amorphous at different deposition temperature. The peaks of Si2p and O1s shifted to higher binding energy with temperature increasing. The SiOx films had high transmissivity at the range of 400-900nm. By analyzing the observation and data, the influence of deposition parameters on the electrical properties and interface characteristics of SiOx thin film prepared by PECVD is systematically discussed. At last, SiOx thin film with excellent electrical properties and good interface characteristic is prepared under the relatively optimum parameters. © (2012) Trans Tech Publications, Switzerland.

关键词： Plasma enhanced chemical vapor deposition

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Texture and space-time based moving objects segmentation and shadow removing

Texture and space-time based moving objects segmentation and...

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3rd International Conference on Swarm Intelligence, ICSI 2012

作者： Guan, Ye-Peng School of Communication and Information Engineering Shanghai University China Key Laboratory of Advanced Displays and System Application Ministry of Education China

ISBN: (纸本)9783642310195

A novel algorithm is developed to detect moving objects and remove cast shadows by exploiting textural and spatial-temporal features. Multi-scale wavelet transformation is used to segment moving objects based on spatial property. Textural and spectral features color ratio differences between two adjacent pixels in four different directions are used to remove cast shadows. RGB color space is selected instead of introducing complex color models to segment moving objects and eliminate shadows. The proposal requires much less efforts compared with currently available methods. It does not require any complex supervised training phase, and does not require manual calibration or makes any hypothesis. Experiments have highlighted that the proposal is robust and efficient to segment moving objects and suppress shadow by comparisons. © 2012 Springer-Verlag.

关键词： Wavelet transforms

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The linkage control strategy for the two-phase flow dispensing system

The linkage control strategy for the two-phase flow dispensi...

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5th International Conference on Intelligent Robotics and applications, ICIRA 2012

作者： Zhang, Jinsong Zhang, Jianhua School of Mechatronics Engineering and Automation Shanghai University China Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai University China

ISBN: (纸本)9783642335143

The fluid dispensing technology has been widely used to deliver all kinds of fluids in electronic industry. This paper first put forward an initial approach based on the direct driving principle to dispense the liquid with a high consistency and precision. According to the direct driving principle, the gasliquid slug flow should be formed as a stable pattern in the micro-channel while the flow rate ratio between the gas and liquid is in an appropriate range. The linkage control strategy had been done to realize the two-phase flow during the dispensing process. The two-phase flow dispensing system had seven subsystems for integration to achieve the multi-functions. The control sub-system is the most important unit applying the industry personal computer to connect and control other sub-systems. It undertakes three main tasks, communication, data processing and feed-back control. As a result, the stream of compressed air injected into the continuous liquid stream controlled by the peristaltic pump, the bubbles and droplets appeared in the micro-channel separately and uniformly. © Springer-Verlag Berlin Heidelberg 2012.

关键词： Two phase flow

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A Robust Illumination Normalization Method Based on Mean Estimation for Face Recognition

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International Scholarly Research Notices 2013年第1期2013卷

作者： Yong Luo Ye-Peng Guan Chang-Qi Zhang School of Communication and Information Engineering Shanghai University 99 Shangda Road Shanghai *** Key Laboratory of Advanced Displays and System Application Ministry of Education 99 Shangda Road Shanghai ***

An illumination normalization method for face recognition has been developed since it was difficult to control lighting conditions efficiently in the practical applications. Considering that the irradiation light is of little variation in a certain area, a mean estimation method is used to simulate the illumination component of a face image. Illumination component is removed by subtracting the mean estimation from the original image. In order to highlight face texture features and suppress the impact of adjacent domains, a ratio of the quotient image and its modulus mean value is obtained. The exponent result of the ratio is closely approximate to a relative reflection component. Since the gray value of facial organs is less than that of the facial skin, postprocessing is applied to the images in order to highlight facial texture for face recognition. Experiments show that the performance by using the proposed method is superior to that of state of the arts.

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