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International Conference on Audio, Language and Image Processing

作者： Zhang, Yang An, Ping Wang, He Zhang, Zhaoyang School of Communication and Information Engineering Shanghai University Shanghai China Key Laboratory of Advanced Displays and System Application Ministry of Education Shanghai University Shanghai China

ISBN: (纸本)9781424458653

In this paper, we present an efficient rectification algorithm for un-calibrated multi-view images based on SIFT (Scale-invariant feature transform) feature matching. Un-calibrated rectification is necessary for some specific occasions and we extend generic stereo pair rectification to multi-view camera array with projection shift method. We bring in SIFT algorithm to extract and match features (key points) automatically. Block-division features extraction method is proposed and RANSAC is used to improve precision of rectifying transformation. From the experiments, we find that our method is effective to rectify parallel cameras array. Rectified images have uniform horizontal disparities and the vertical mismatches between adjacent views are eliminated. ©2010 IEEE.

关键词： Cameras

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Uncalibrated camera vision pointing recognition for HCI

Uncalibrated camera vision pointing recognition for HCI

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International Conference on Computational Science and Engineering

作者： Guan, Ye-Peng School of Communication and Information Engineering Shanghai University Shanghai 200072 China Key Laboratory of Advanced Displays and System Application Ministry of Education Shanghai 200072 China

ISBN: (纸本)9780769543239

Among gestures in non-verbal communication, pointing gesture can be taken as one of natural human computer interfaces. Vision based hand pointing is an optimal model for human-computer interaction (HCI). One of key problems among the vision based pointing gesture is how to recognize the pointing. Aiming at some limits existing in the literature, a novel method is developed to estimate pointing gestures based on some non-calibrated cameras. Multiple un-calibrated cameras are adopted to determine the pointing target based on pointing features extracted from multiple cameras and support vector machine (SVM) classifier. No explicit constraints are set on the cameras placement. Pointing user can move freely inside a wider interaction environment while pointing at some targets. The mentioned approach does not constrain the pointing surface whether is flat or not, or the target is visible by the cameras. Edge detection based on multi-scale wavelet transformation is used to extract pointing objects from a clutter background. Experiments have shown that the developed approach is efficient for pointing recognition by comparisons. © 2010 IEEE.

关键词： Support vector machines

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Multi-view video coding based on sequence correlation

Multi-view video coding based on sequence correlation

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2010 International Conference on Audio, Language and Image Processing, ICALIP 2010

作者： Lu, Feng An, Ping Zhang, Zhaoyang Shen, Liquan School of Communication and Information Engineering Shanghai University Shanghai 200072 China Key Laboratory of Advanced Displays and System Application Ministry of Education Shanghai 200072 China

ISBN: (纸本)9781424458653

Traditional coding method used the same prediction structure to encode the multi-view sequences whose correlation are distinctly different. This method eliminated the temporal and spatial redundancy by using multi-references blindly. Although the traditional prediction structures have quite good coding efficiency, it results in the problem of high complexity. So by analyzing the characteristic of the multiview video data itself, we designed a correlation testing structure and depending on the correlation intensity on both the temporal and spatial direction, a method of multiple prediction structures coding jointly is proposed. Experimental results show that the proposed method can reduce the coding complexity while maintaining high coding efficiency, and to the sequences whose spatial correlation is quite strong, the method given can not only raise the PSNR, but reduce the bitrate as well. ©2010 IEEE.

关键词： Forecasting

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Hydrogen passivation for the performance enhancement of poly-Si crystallized by double-frequency YAG laser

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Optoelectronics Letters 2010年第4期6卷 288-290页

作者：李娟丁思维姚颖罗翀孟志国吴春亚熊绍珍张志林郭海诚 Tianjin Key Laboratory of Photo-electronic Thin Film Devices and Technology Key Laboratory of Opto-electronic Information Science and Technology(Nankai University and Tianjin University) Ministry of Education Institute of Photo-electronics Nankai University Key Laboratory of Advanced Display and System Applications Ministry of EducationShanghai University Department of Electronic and Computer Engineering The Hong Kong University of Science and Technology

The hydrogen passivation is adopted to enhance the performance of poly-Si crystallized by YAG laser annealing(LA polySi).The effects of passivation time,passivation power and passivation temperature on the hall mobility of the LA poly-Si are investigated and the mechanism of the hydrogen passivation is preliminarily *** is found that the effect of the hydrogen passivation on the qulity of YAG laser annealed poly-Si is also correlated with the deposition method and the defect type in it.

关键词： YAG激光器性能增强氢钝化结晶双频率聚硅激光退火多晶硅

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Salient object segmentation based on graph cut

Salient object segmentation based on graph cut

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IEEE International Symposium on Intelligent Signal Processing and Communication systems (ISPACS)

作者： Ran Shi Zhi Liu Yinzhu Xue School of Communication and Information Engineering Shanghai University China Key Laboratory of Advanced Display and System Application Ministry of Education China

Salient object segmentation is an important technique for many content based applications. This paper presents an unsupervised salient object segmentation method under the graph cut optimization framework. First, we exploit a kernel density estimation based saliency model to generate the saliency map, which provides the useful cues for object segmentation. Then we exploit the saliency map to adaptively define the region cost term, the boundary cost term and their balancing weight in the cost function, which is minimized using graph cut to obtain a binary segmentation of salient objects. Experimental results on a variety of images demonstrate the better segmentation performance of our approach.

关键词： Image segmentation

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Nonparametric saliency detection using kernel density estimation

Nonparametric saliency detection using kernel density estima...

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IEEE International Conference on Image Processing

作者： Zhi Liu Yinzhu Xue Liquan Shen Zhaoyang Zhang School of Communication and Information Engineering Shanghai University China Key Laboratory of Advanced Display and System Application Ministry of Education China

This paper proposes a nonparametric saliency model based on kernel density estimation (KDE) mainly aiming at content-based applications such as salient object segmentation. A set of KDE models are constructed on the basis of regions segmented using the mean shift algorithm. For each pixel, a set of color likelihood measures to all KDE models are calculated, and then the color saliency and spatial saliency of each KDE model are evaluated based on its color distinctiveness and spatial distribution. The final saliency map is generated by combining saliency measures of KDE models and color likelihood measures of pixels. Experimental results demonstrate the better saliency detection performance of our saliency model.

关键词： Image color analysis Mathematical model Pixel Kernel Computational modeling Image segmentation Estimation

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Single-channel blind separation of JPEG permuted image using double compression

Single-channel blind separation of JPEG permuted image using...

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2010 International Conference on Audio, Language and Image Processing, ICALIP 2010

作者： Wang, Wei Fang, Yong School of Communication and Information Engineering Key Laboratory of Specialty Fiber Optics and Optical Access Networks Shanghai University Shanghai 200072 China Key Laboratory of Advanced Display and System Applications Shanghai University Ministry of Education 200072 China

ISBN: (纸本)9781424458653

A novel blind separation algorithm based on double compression for single-channel JPEG permuted image was proposed in this paper. Firstly, the permuted image was compressed again, and then the primary compression factors were estimated by calculating the correlation coefficients of image blocks in pre and post recompression. Secondly, a 'mapping space' was constructed based on the primary compression factors estimated, according to different classification parameters in the mapping space, the activation region could be accurately detected and the permutation mixing matrixes were estimated. Lastly, the source image blocks could be completely recovered using permutation mixing matrix estimated. Simulation results show a high detection accuracy on the permuted image with uncompressed and without noised. Furthermore, the robustness against Gaussian noise and lossy JPEG compression of the algorithm were analyzed in this paper. ©2010 IEEE.

关键词： Mapping

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ASIC design of UHF RFID reader digital baseband

ASIC design of UHF RFID reader digital baseband

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Asia Pacific Conference on Postgraduate Research in Microelectronics & Electronics (PrimeAsia)

作者： Jing Liu Yihao Chen Bin Gu Runxi Zhang Feng Ran Zongsheng Lai IMCS East China Jiao Tong University Shanghai China Key laboratory of advanced display and system application Shanghai University China

This paper presents the ASIC design and implementation of digital baseband system for UHF RFID reader based on EPC Global C1G2 /ISO 18000-6c protocol. The digital baseband system consists of two parts: transmitter and receiver, which inculing encoding module, decoding module, channel filers, CRC chenk module, control module and a SPI module. It is described in verilog HDL in RTL level, with Design Compiler for synthesizing, PT for static timing analyzing and Astro for physical design. The die is fabricated using IBM 130nm 8-layer-metal RF cmos process successfully, which size is 3 mm × 3mm, the power consumption is around 6.7mW. It can be applied in the research of single-chip UHF RFID reader.

关键词： Radiofrequency identification Baseband Finite impulse response filter Protocols Encoding IIR filters Decoding

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Numerical Investigation on the Thermal Properties of the Micro-cooler

Numerical Investigation on the Thermal Properties of the Mic...

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2010 11th International Conference on Electronic Packaging Technology & High Density Packaging(2010 电子封装技术与高密度封装国际会议)

作者： Shun Wang Yangming Liu Yan Zhang Johan Liu Key Laboratory of Advanced Display and System Applications Ministry of Education & SMIT Center Sch Key Laboratory of Advanced Display and System Applications Ministry of Education & SMIT Center Sch

The micro-pin-fins prepared on the back side of the power chip enable heat removal on the level of modern microsystem demands. Carbon nanotube (CNT) has been proven to be a potential material for micro-cooler because of its superior advantages including high thermal conductivity, good mechanical property and so forth. And there emerges various applications of CNT in the micro-cooler system. In the present paper, micro-pin-fin heat sink with gas impinging jet as the cooling medium is analyzed. The heat dissipation of forced air convection cooling with micro-pin-fin structures made of aligned carbon nanotube arrays has been taken into consideration. The three-dimensional computational fluid dynamics (CFD) simulation was carried out. The temperature distribution and the pressure drop are studied in the cases of various geometrical parameters of the micro-pin-fin heat sinks at the same heating power prescribed. The fluid flow and the heat transfer phenomena in the micro-pin-fins heat sinks are investigated. The heat removal efficiency of the air micro-cooler is evaluated. An array of 8×8 fins with the optimized fin-to-base length ratio achieves the best cooling effect.

关键词： Heat sinks Heat transfer Space heating Temperature distribution Mathematical model Carbon nanotubes

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The design and realization of CAN bit timing logic

The design and realization of CAN bit timing logic

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2nd Asia Pacific Conference on Postgraduate Research in Microelectronics and Electronics, PrimeAsia 2010

作者： Jinyan, Guo Yueli, Hu Key Laboratory of Advanced Display and System Applications Ministry of Education Shanghai University Shanghai 200072 China College of Mechanical and Electronic Engineering and Automation Shanghai Key Laboratory of Power Station Automation Technology Shanghai University Shanghai 200072 China

ISBN: (纸本)9781424467372

In the CAN bus, mistakes in bit timing will lead to serious decline in bus performance. How to deal with the bit timing of CAN bus communication decided whether the CAN controller can receive or transmit data correctly. According to bus protocol, bit synchronization will fix bit errors resulting from improper setting in many cases. This paper illustrated the structure of nominal bit time and the principle of bit synchronization, gave an optimized method of nominal bit time of CAN2.0 protocol, that the four non-overlapping segments of traditional nominal bit time is simplified to 3 non-overlapping segments, and on this basis, proposed a design method of bit timing processor of CAN bus based on the synchronized state machine. It also provides programmable time segments to compensate for the propagation delay times and phase shifts, and gave simulation and verification of the design. The results show that the design work which obeys the CAN2.0 protocol, can more easily deal with the CAN bus communication bit timing, realized the control of CAN bus protocol on the bit timing and bit synchronization, and better optimizes the CAN network.

关键词： Synchronization

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