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IET International Communication Conference on Wireless Mobile and Computing, CCWMC 2011

作者： Liu, Liliang An, Ping Zheng, Zhuan Zhang, Zhaoyang 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)9781849195058

Multi-camera calibration parameters are needed in free-viewpoint video system to obtain virtual viewpoint. Most existing calibration technologies are for single camera and further research is needed for multi-camera calibration. A multi-camera calibration method based on 2D plane calibration algorithm combined with stereo vision calibration is proposed in this paper. Camera intrinsic parameters can be obtained using 2D plane calibration algorithm. Through transforming the world coordinate system, the unique extrinsic parameters are got. The validity of the proposed method is verified by experiments.

关键词： Calibration

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Multi-view video coding based on resultant vector estimation

Multi-view video coding based on resultant vector estimation

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IET Conference on Wireless, Mobile and Sensor Networks 2007, CCWMSN'07

作者： Liu, Suxing An, Ping Zhang, Zhaoyang Liu, Zhanwei 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)9780863418365

Aiming at fully exploiting the temporal redundancy and spatial redundancy, we propose a multi-view video coding scheme based on resultant vector estimation. Combining the disparity vector and motion vector as one vector, the novel "resultant vector" was first proposed. Meanwhile, by extending the loop constraint to multi-view images for a parallel camera geometry model, redundancy between views is greatly reduced by utilizing the linear relationship of adjacent views and the "resultant vector". Experimental results show that our scheme's performance is superior to conventional methods such as GOP (Group-of-picture) or M-picture. Coding efficiency is improved about 1.2-1.5 dB.

关键词： Vectors

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Fast mode decision algorithm for quality scalable HEVC 13th

Fast mode decision algorithm for quality scalable HEVC

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13th International Forum of Digital TV and Wireless Multimedia Communication, IFTC 2016

作者： Kang, Mengmeng Ma, Ran Li, Zefu Hu, Xiangyu An, Ping School of Communication and Information Engineering Shanghai University Shanghai200072 China Key Laboratory of Advanced Displays and System Application Ministry of Education Shanghai200072 China

ISBN: (纸本)9789811042102

In order to adapt networks and various devices, the Joint Collaborative Team on Video Coding (JCTVC) develops scalable HEVC (SHVC), which is an extension of HEVC. It is important to reduce the complexity of SHVC because of its high computational time, which may not be suitable for real-time application scenarios. In this paper, we exploit the correlation between the current CU and nearby CUs to skip some unnecessary mode. Meanwhile, we also use the correlation between base layer and enhancement layer to reduce the coding complexity. Experimental results show that our proposed coding algorithm can reduce the coding complexity by 37.7%, with a slight decrease in PSNR of 0.01 dB in base layer and 0.004 dB in enhancement layer, respectively. In the meantime, the R-D performance of luma and chroma is degraded about 0.7% on average. © Springer Nature Singapore Pte Ltd. 2017.

关键词： Complex networks

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3D holoscopic images coding scheme based on viewpoint image rendering 13th

3D holoscopic images coding scheme based on viewpoint image ...

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13th International Forum of Digital TV and Wireless Multimedia Communication, IFTC 2016

作者： Yang, Ling An, Ping Liu, Deyang Ma, Ran School of Communication and Information Engineering Shanghai University Shanghai200072 China Key Laboratory of Advanced Displays and System Application Ministry of Education Shanghai200072 China

ISBN: (纸本)9789811042102

3D holoscopic imaging can provide immersive 3D viewing experiences, which is considered to be a promising 3D acquisition and display solution. However, in order to proper storage and delivery such particular type of image, efficient coding schemes are of great importance. Therefore, in this paper, we propose a new coding scheme based on viewpoint image rendering. All the viewpoint images are rendered firstly from the 3D holoscopic contents. The total rendered viewpoint images are then arranged into a video sequence. HEVC inter coding method is utilized to remove the redundancy among the rendered viewpoint images. Experimental results show that the proposed coding scheme can achieve average 2.70 dB quality improvements for holoscopic images compared to HEVC intra standard. © Springer Nature Singapore Pte Ltd. 2017.

关键词： Image coding

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A rectification algorithm for un-calibrated multi-view images based on SIFT features

A rectification algorithm for un-calibrated multi-view image...

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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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An improved 3D holoscopic image coding scheme using HEVC based on Gaussian mixture models 13th

An improved 3D holoscopic image coding scheme using HEVC bas...

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13th International Forum of Digital TV and Wireless Multimedia Communication, IFTC 2016

作者： Liu, Deyang An, Ping Du, Tengyue Ma, Ran Shen, Liquan School of Communication and Information Engineering Shanghai University Shanghai200072 China Key Laboratory of Advanced Displays and System Application Ministry of Education Shanghai200072 China

ISBN: (纸本)9789811042102

3D holoscopic system can provide continuous motion parallax throughout the viewing zone with precise convergence and depth perception, for which it is regarded as a promising technique for future 3D TV. In this paper, a 3D holoscopic image coding scheme based on Gaussian mixture models (GMM) is introduced firstly, taking full advantage of the intrinsic characteristic of such particular type of content. Due to the shortcomings of GMM based method, an improved method is thereafter put forward, in which many parameters that are insignificant in the final estimator of GMM based method are avoided, and more surrounding pixels are used to obtain the model parameters with the help of the least square method. Experimental results indicate that the improved method can obtain considerable gains over HEVC intra prediction and several other prediction methods. © Springer Nature Singapore Pte Ltd. 2017.

关键词： Image coding

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A novel intermediate view synthesis method

A novel intermediate view synthesis method

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Institution of Engineering and Technology International Communication Conference on Wireless Mobile and Computing

作者： Zhang, Qian An, Ping Wang, He Zhang, Zhaoyang Ju, Qin 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)9781849191388

The intermediate view synthesis from arbitrary view plays an important role in three dimensional television system and multi-video compression. In this paper, we present a new view synthesis method based on a modified support-weights computation in disparity estimation, which utilize the centralized color vector and phase information, then we propose a view synthesis method. The experimental results show that our method improves the quality of the synthesized intermediate image compared with the well-known viewpoint synthesis method.

关键词： Television systems

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Enhanced Privacy-Preserving WiFi Fingerprint Localization from CL Encryption

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Chinese Journal of Electronics 2024年第6期33卷 1435-1446页

作者： Zhiwei WANG Qiuchi ZHU Zhenqi ZHANG School of Computer Nanjing University of Posts and Telecommunications State Key Laboratory of Public Big Data Guizhou University Advanced Cryptography and System Security Key Laboratory of Sichuan Province Chengdu University of Information Engineering Key Laboratory of Computational Science and Application of Hainan Province Hainan Normal University

The WiFi fingerprint-based localization method is considered one of the most popular techniques for indoor localization. In INFOCOM'14, Li et al. proposed a wireless fidelity(WiFi) fingerprint localization system based on Paillier encryption, which is claimed to protect both client C 's location privacy and service provider S's database privacy. However, Yang et al. presented a practical data privacy attack in INFOCOM'18, which allows a polynomial time attacker to obtain S's database. We propose a novel WiFi fingerprint localization system based on CastagnosLaguillaumie(CL) encryption, which has a trustless setup and is efficient due to the excellent properties of CL encryption. To prevent Yang et al.'s attack, the system requires that S selects only the locations from its database that can receive the nonzero signals from all the available access points in C 's nonzero fingerprint in order to determine C's location. Security analysis shows that our scheme is secure under Li et al.'s threat model. Furthermore, to enhance the security level of privacy-preserving WiFi fingerprint localization scheme based on CL encryption, we propose a secure and efficient zero-knowledge proof protocol for the discrete logarithm relations in C's encrypted localization queries.

关键词： Location awareness Threat modeling Data privacy Protocols Databases Fingerprint recognition Trustless services Encryption Servers Wireless fidelity

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Integration and verification case of IP-core based system on chip design

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Journal of Shanghai University(English Edition) 2010年第5期14卷 349-353页

作者：胡越黎周谌 School of Mechanical and Electronic Engineering and Automation Shanghai University Key Laboratory of Advanced Display and System Application

In this paper, the design and verification process of an automobile-engine-fan control system on chip （SoC） are introduced. The SoC system, SHU-MV08, reuses four new intellectual property （IP） cores and the design flow is accomplished with 0.35 btm chartered CMOS technology. Some special functions of IP cores, the detailed integration scheme of four IP cores, and the verification method of the entire SoC are presented. To settle the verification problems brought by analog IP cores, NanoSim based chip-level mixed-signal verification method is introduced. The verification time is greatly reduced and the first tape-out achieves success which proves the validity of our design.

关键词： system on chip (SoC) intellectual property (IP)-core integration verification pulse width modulation (PWM)- analog digital converter (ADC) linkage running

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Online-programming IP design and implementation based on SoC

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Open Automation and Control systems Journal 2013年第1期5卷 59-66页

作者： Yang, Wenrong Jiang, Chao Hu, Yueli Key Laboratory of Advanced Display and System Application Shanghai University Shanghai 200072 China School of Mechatronic Engineering and Automation Shanghai University Shanghai 200072 China

It is mainly proposed that the design and implementation for an online-programming IP core based on MV10, an SoC, which is an 8-bit MCU having passed the silicon verification with Global Foundry 0.35um mix-signal library in this thesis. The online-programming IP core can write BIN file into the on-chip SRAM, which is mainly controlled by erasing state machine and programming state machine, for program debugging with high accuracy-communication and error self-detection. The online-programming IP core proposed in this thesis can also be used in other SoCs. © Yang et al.

关键词： system-on-chip

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