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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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Motion foreground detection based on wavelet transformation and color ratio difference

Motion foreground detection based on wavelet transformation ...

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2010 3rd International Congress on Image and Signal Processing, CISP 2010

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

ISBN: (纸本)9781424465149

An algorithm is presented for detecting foreground objects with multi-scale wavelet transformation and color ratio difference. Multi-scale wavelet transformation method is used to segment moving objects based on spatial property. Ratio differences between two adjacent pixels in four different directions are used to classify object pixels. RGB color space is selected to segment moving foregrounds and eliminate cast shadows instead of complex color models. The developed approach does not require any complex supervised training phase, manual calibration or hypothesis in removing shadow. Experiments have highlighted that the proposal is efficient to segment foregrounds and suppress shadows. ©2010 IEEE.

关键词： Pixels

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Remote sensing image interpolation via the nonsubsampled contourlet transform

Remote sensing image interpolation via the nonsubsampled con...

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2nd International Conference on Image Analysis and Signal Processing, IASP'2010

作者： Xu, Tongyang Fang, Yong School of Comm. and Info. Eng. Key Lab of Specialty Fiber Optics and Optical Access Networks Shanghai University Shanghai China Key Laboratory of Advanced Display and System Applications Shanghai China

ISBN: (纸本)9781424455553

A novel nonsubsampled contourlet Bi-linear interpolation algorithm for remote sensing image is proposed, which is based on the estimation of detail nonsubsampled contourlet coefficients at high resolution scales. The method employs Bi-linear interpolation algorithm to anticipate the high frequency component on high resolution from the high frequency component on low resolution. The experiment results demonstrate that the algorithm can get a higher PSNR and keep more image detail information than traditional interpolation algorithms. ©2010 IEEE.

关键词： Interpolation

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Multi-beam steering for 3D audio rendering in linear phased loudspeaker arrays

Multi-beam steering for 3D audio rendering in linear phased ...

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2nd International Conference on Image Analysis and Signal Processing, IASP'2010

作者： Tang, Yongqing Fang, Yong Huang, Qinghua School of Comm. and Info. Eng. Key Lab of Specialty Fiber Optics and Optical Access Networks Shanghai University Shanghai China Key Laboratory of Advanced Display and System Applications Shanghai China

ISBN: (纸本)9781424455553

In order to improve flexibility of surrounding stereo system, a novel system for 3D audio rendering is proposed in this paper based on multi-beam steering, which is composed of five beam units using linear loudspeaker arrays. By controlling accurately time delay or phase of loudspeakers, beam can be formed in a desired direction. The simulation results show that the proposed method is reasonable and effective. ©2010 IEEE.

关键词： Loudspeakers

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VLSI implementation of sub-pixel interpolator for AVS encoder

VLSI implementation of sub-pixel interpolator for AVS encode...

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2010 International Conference on Life system Modeling and Simulation, LSMS 2010 and the 2010 International Conference on Intelligent Computing for Sustainable Energy and Environment, ICSEE 2010

作者： Guanghua, Chen Anqi, Wang Dengji, Hu Shiwei, Ma Weimin, Zeng School of Mechatronics Engineering and Automation Shanghai Key Laboratory of Power Station Automation Technology Shanghai University Shanghai 200072 China Key Laboratory of Advanced Display and System Applications Microelectronic Research and Development Center Shanghai University Shanghai 200072 China

Interpolation is the main bottleneck in AVS real-time high definition video encoder for its high memory bandwidth and large calculation complexity caused by the new coding features of variable block size and 4-tap filter. In this paper, a high performance VLSI architecture of interpolation supporting AVS Baseline@L4 is presented. Vertical redundant data reuse, horizontal redundant data reuse and sub-pixel data reuse schemes are presented to reduce memory bandwidth and processing cycle. The separated 1-D interpolation filters are used to improve throughput and hardware utilization. The proposed design is implemented on FPGA with operating frequency of 150MHz and can support 1080p (1920x1080)/30fps AVS real-time encoder. It is a useful intellectual property design for real-time high definition video application. © 2010 Springer-Verlag.

关键词： Pixels

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The Effect of Functionalized Silver on Rheological and Electrical Properties of Conductive Adhesives

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ECS Transactions 2011年第1期34卷

作者： Qiong Fan Huiwang Cui Chune Fu Dongsheng Li Xin Tang Zhichao Yuan Lilei Ye Johan Liu Ministry of Education and SMIT Center Shanghai University Key Laboratory of Advanced Display and System Applications Ministry of Education and SMIT Center Shanghai University Key Laboratory of Advanced Display and System Applications Ministry of Education and SMIT Center Shanghai University No.149 Yanchang Road Shanghai Shanghai 200072 China Shang Da Rui Hu Microsystem Integration Technology Co.Ltd Shanghai University SHT Smart High Tech AB Shanghai University SE-412 96 Gothenburg Gothenburg 41296 Sweden

This research used low molecular surface modifiers, and observed that chemisorptions took place through the formation of a bond between silver surface and an adsorbed molecule, which improved the dispersion of silver flakes in the organic resin. Several different functionalizers, such as thioglycolic acid, silane and di-acid, were used to functionalize the silver surface. Results of shear viscosity, bulk resistivity etc. showed that by using these low molecular organic functionalizers, isotropic conductive adhesives (ICAs) with lower shear viscosity and better electrical conductivity at high silver fillers content were obtained. The adipic acid had the greatest effect on the rheological and electrical property of ICAs, so its weight percentage in silver flakes was also optimized; ICAs displayed the maximum electrical conductivity when there was 0.5 wt% of silver flakes.

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An Efficient Deblocking Filter Algorithm in Multi-view Video Coding

An Efficient Deblocking Filter Algorithm in Multi-view Video...

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2010 International Conference on Audio,Language and Image Processing(2010年音频、语言与图像处理国际会议 ICALIP 2010)

作者： Ying Fu Yongfang Wang Zhaoyang Zhang School of Communication and Information Engineering Shanghai University Shanghai 200072 China Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai 200072 China

ISBN: (纸本)9781424458653

Image and video coding in block-based image coding can cause blocking artifacts, which severely degrade visual quality in the compressed sequences. Loop deblocking filter method can reduce these artifacts and improve the video objective and subjective quality obviously. In this paper, we propose an efficient deblocking filtering method for multiview video coding, which considers the color bleeding distortion. Experimental results show that this proposed algorithm outperforms the traditional deblocking algorithm in terms of PSNR and subjective visual quality when QP value is relatively high.

关键词： Video coding Filtering algorithms Peak signal-to-noise ratio image coding Image images block effect Artifacts model based image coding

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