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Research on technology of desktop virtualization based on SPICE protocol and its improvement solutions

Frontiers of Computer Science 2014年第6期8卷 885-892页

作者： Yuqing LAN Hao XU School of Computer Science and Engineering Beihang University Beijing 100191 China

Increasingly mature cloud computing technology promotes virtual desktop technology, which can solve many problems existing in traditional computing models. However, virtual desktop solutions introduce the thorny problem of how to deliver a real desktop experience to users, as if they are using it locally, especially when playing video. The SPICE （simple protocol for independent computing environments） virtual desktop solution provides several image compression algorithms to address this problem with the purpose of making virtual desktops as real as possible. Although different compression algorithms can contribute their own abilities to different images to a large extent, switching between them is a big problem that consumes a large amount of resources to detect the different type of image and also causes jitter of the virtual desktop. This paper proposes a new solution, called SPICEx, using the JPEG2000 compression algorithm with dynamic compression ratios to solve the problem and finally validates that the performance is better than that of SPICE. With better quality of user experience and also reducing bandwidth consumption, SPICEx solution is meaningful in virtual desktop fields and can be widely used.

关键词： virtual desktop SPICE compression algorithm JPEG2000 SPICEx

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Cluster parallel rendering based on encoded mesh

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第7期7卷 1124-1133页

作者： QIN Ai-hong XIONG Hua PENG Hao-yu LIU Zhen SHI Jiao-ying State Key Lab of CAD ＆ CG Zhejiang University Hangzhou 310027 China School of Computer and lnformation Technology Shanxi University Taiyuan 030006 China

Use of compressed mesh in parallel rendering architecture is still an unexplored area, the main challenge of which is to partition and sort the encoded mesh in compression-domain. This paper presents a mesh compression scheme PRMC (Parallel Rendering based Mesh compression) supplying encoded meshes that can be partitioned and sorted in parallel rendering system even in encoded-domain. First, we segment the mesh into submeshes and clip the submeshes’ boundary into Runs, and then piecewise compress the submeshes and Runs respectively. With the help of several auxiliary index tables, compressed submeshes and Runs can serve as rendering primitives in parallel rendering system. Based on PRMC, we design and implement a parallel rendering architecture. Compared with uncompressed representation, experimental results showed that PRMC meshes applied in cluster parallel rendering system can dramatically reduce the communication requirement.

关键词： Cluster Parallel rendering Rendering compression algorithm Mesh coding Mesh segmentation

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Development of a Wireless Capsule Endoscope System Based on Field Programmable Gate Array

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Journal of Shanghai Jiaotong university(Science) 2017年第2期22卷 156-160页

作者：李四青刘华 School of Electronic Information and Electrical Engineering Shanghai Jiao Tong UniversityShanghai 200240China

A new modular and programmable wireless capsule endoscope is presented in this paper. The capsule system consumes low power and has small physical size. A new image compression algorithm is presented in this paper to reduce power consumption and silicon area. The compression algorithm includes color space transform, uniform quantization, sub-sampling, differential pulse code modulation (DPCM) and Golomb-Rice code. The algorithm is tested in a field programmable gate array (FPGA) development board, and the final result achieves 80% compression rate at 40 dB peak signal to noise ratio (PSNR). The algorithm has high image compression efficiency and low power consumption, compared to other existing works. The system is composed of the following three parts: image capsule endoscope, portable wireless receiver and host computer software. The software and hardware design of the three parts are disscussed in details. © 2017, Shanghai Jiaotong University and Springer-Verlag Berlin Heidelberg.

关键词： capsule endoscope portable receiver compression algorithm field programmable gate array(FPGA)

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Two effective approaches to reduce data storage in reverse time migration

Two effective approaches to reduce data storage in reverse t...

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中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： Weijia Sun Li-Yun Fu Key Laboratory of the Earth’s Deep Interior Institute of Geology and GeophysicsChinese Academy of Sciences

Prestack reverse time migration(RTM) requires extensive data storage since it computes wavefields in forward time and accesses wavefields in reverse *** first review several successful schemes that have been proposed to reduce data storage,but require more computational *** propose two effective strategies to reduce data storage during *** first strategy is based on the Nyquist sampling theorem,which involves no extra computational *** fact is that the time sampling intervals required by numerical algorithms or given by field records is generally several times smaller than that satisfied by the Nyquist sampling ***,we can correlate the source wavefields with the receiver wavefields at the Nyquist time step,which helps decrease storage of time *** second strategy is based on a lossless compression algorithm,which is widely used in computer science and information *** compression approach reduces storage significantly at a little computational *** examples show that the two proposed strategies are effective and efficient.

关键词： Reverse time migration Data storage Nyquist theorem compression algorithm

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