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Geometry clipmap算法扩展研究

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系统仿真学报 2009年第S1期21卷 136-140页

作者：吴健曹妍妍崔志明王晓军苏州大学江苏省计算机信息处理技术重点实验室江苏215006 苏州大学智能信息处理及应用研究所江苏215006

Geometry clipmap算法是一种基于GPU优化的LOD算法,在研究Geometry clipmap算法的基础上,对该算法进行了扩展。增加了地形数据调度模块,采用地形块预读取和预卸载策略,实现对海量地形数据的内外存管理。对内存中clipmap堆栈的数据结构... 详细信息

Geometry clipmap算法是一种基于GPU优化的LOD算法,在研究Geometry clipmap算法的基础上,对该算法进行了扩展。增加了地形数据调度模块,采用地形块预读取和预卸载策略,实现对海量地形数据的内外存管理。对内存中clipmap堆栈的数据结构进行了改进,取消了原始算法中clipmap Pyramid部分。将Geometry Instancing技术引入渲染过程,进一步提升了渲染速度。实验表明,该算法实用有效,能够满足大规模地形可视化的实时渲染要求。

关键词： GPU 地形LOD Geometry clipmap 四叉树

Face Video key-Frame Extraction Algorithm Based on color Histogram

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Face Video Key-Frame Extraction Algorithm Based on Color His...

2011 4th IEEE International conference on computer Science and information technology(IccSIT 2011)

作者： Xintao Li School of computer Science & technology soochow university suzhou Jiangsu 215006 c.ina Tiongrong Xu School of computer Science & technology soochow university suzhou Jiangsu 215006 c.ina

Video-based face recognition has been widely studied in recently *** common method of video face recognition is to recognize of every face frames that *** method not only cause large computing complexity,but also when face gesture and illumination change greatly,the face images collected contain very little information that can be used,these samples may have a negative effect to the results of recognition and even cause the recognition ***,this paper proposes a method for facial video key frame extraction based on color histogram,the purpose is to remove the redundant frames,reduce the computational complexity and improve recognition efficiency.

关键词： video face recognition key-frame extraction color histogram

Organizing Structured Deep Web Sources with Semantic Inference

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Organizing Structured Deep Web Sources with Semantic Inferen...

第四届全国信息检索与内容安全学术会议

作者： Li HUANG~(1,2) Wei FANG~(1,2) Hongpin cHEN~(1,2) Pengpeng ZHAO~(1,2) Zhiming cUI~(1,2↑) ~1 Jiangsu key laboratory of computer information processing technology,soochow university,215006 ~2 Institute of Intelligent information processing and Application,soochow university,Jiangsu suzhou,215006

Deep Web sources classification is one of key steps in Large-scale data integration,and structured query interface of Deep Web serves as a valid approach for research on online databases organization by *** paper proposes a novel classification strategy on Deep Web *** features and co-occurrence features could be obtained by semantic inference from visible features of query interface,which enrich semantic features in *** of semantic inference and machine learning method effectively can further improve traditional classification performance on Deep Web *** results on real web datasets show that our method is improved with higher classification accuracy.

关键词： Deep Web Semantic Inference Decision Feature co-occurrence.

A Visible Watermarking Algorithm Holding image content

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A Visible Watermarking Algorithm Holding image Content

第一届图像传播国际会议

作者： Shengrong Gong Shanchao Yang college of computer Science and technology soochow university suzhou c.ina 215006

＜正＞Watermark visibility, host image quality loss and watermark robustness are the basic requirements of visible watermarking algorithm. The paper dwells on image noise masking and image content importance and indicates: when algorithm only considers noise masking, consistent watermark visibility can be guaranteed, but image will suffer detail loss;when algorithm only considers image content importance, algorithm with least host image loss can be designed, but robustness will be lost. Therefore, first a wavelet visible watermarking algorithm is proposed based on noise masking whose embedding strength is adaptive to different images with different characteristics, then improvement is made based on texture feature of watermark image which lowers host image loss. Finally an image content holding strategy is proposed to lower host image loss further more. Experimental results show that the proposed algorithms in this article can ensure watermark visibility, and that the two improved strategies are effective, After improvements, host image loss becomes less.

关键词： Visible Watermarking DWT Transformation Image content

Secure and Efficient VSS Scheme Based on Partial Broadcast channels

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Secure and Efficient VSS Scheme Based on Partial Broadcast C...

第四届全国信息检索与内容安全学术会议

作者： Jialing WANG~(1,2) Yanqin ZHU~(1,2) Xizhao LUO~(1,2) ~1School of computer Science & technology,soochow university,Su Zhou 215006,c.ina ~2Jiangsu provincial key laboratory of computer information processing technology,Su Zhou 215006,c.ina

In the conventional verifiable secret sharing scheme,a dealer uses point-to-point secure channels to distribute the shares of a secret to a number of *** and Wang proposed a secret sharing scheme based on partial broadcast channels,which reduced the number of the *** it supposed that both the dealer and participants were *** this paper,we present a secure and efficient verifiable secret sharing(VSS) scheme based on partial broadcast channels,which solves the problem in Rei and Wang’s *** the analysis of the scheme,we get that it is secure and efficient,and has the advantage of the number of channels and the total communications needed compared with the conventional verifiable secret sharing scheme.

关键词： Verifiable secret sharing Partial broadcast channels Perfect hash family

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基于统计数据的Web站点测试

计算机科学 2003年第10期30卷 21-24页

作者：许蕾徐宝文陈振强东南大学计算机科学与工程系南京210096 武汉大学软件工程国家重点实验室武汉430072 江苏省计算机信息处理技术重点实验室开放基金苏州大学苏州215006

1引言Web应用具有广泛性、交互性和易用性等特点,其迅猛的发展态势吸引了人们广泛的关注[19].能够吸引尽可能多的用户并对其长时间关注是网站追求的主要目标,也是衡量一个网站是否成功的主要指标[1].

关键词：用户访问模式网页分组网站 Web站点测试统计数据

A Feedback-Based Web Search Engine

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Wuhan university Journal of Natural Sciences 2004年第5期9卷 561-568页

作者： ZHANG Wei-feng 1,2,3 , XU Bao-wen 2,3,4 , ZHOU Xiao-yu 2,3,4 1. Department of computer Science and Engineering, Nanjing university of Posts and Telecommunications, Nanjing 210003, Jiangsu, c.ina 2. Department of computer Science and Engineering, Southeast university, Nanjing 210096, Jiangsu, c.ina 3. Jiangsu Institute of Software Quality, Nanjing 210096 Jiangsu, c.ina 4. The State key laboratory of Software Engineering, Wuhan university, Wuhan 430072, Hubei, c.ina Department of computer Science and Engineering Nanjing University of Posts and Telecommunications . Nanjing 210003 Jiangsu China

Web search engines are very useful information service tools in the Internet. The current web search engines produce search results relating to the search terms and the actual information collected by them. Since the selections of the search results cannot affect the future ones, they may not cover most people’s interests. In this paper, feedback information produced by the user’s accessing lists will be represented by the rough set and can reconstruct the query string and influence the search results. And thus the search engines can provide self-adaptability. key words WWW - search engine - query reconstruction - feedback cLc number TP 311. 135.4 Foundation item: Supported by the National Natural Science Fundation of c.ina (60373066). National Grand Fundamental Research 973 Program of c.ina (2002cB31200). Opening Foundation of State key laboratory of Software Engineering in Wuhan university, Opening Foundation of Jiangsu key laboratory of computer information processing technology in soochow universityBiography: ZHANG Wei-feng (1975-), male, Ph.D. research direction: artificial intelligence, search engine, data mining, network language.

关键词： WWW search engine query reconstruction feedback

Study on the Fabrication of Low Gradient Photoresist Grating Masks

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Study on the Fabrication of Low Gradient Photoresist Grating...

2007亚洲光电子会议全息/衍射光学及应用分会场

作者： LIU Quan a b WAN Huac WU Jianhong a b cHEN Xinrong a b LI chaoming a b a Institute of information Optical Engineering soochow university suzhou c.ina 215006 b Jiangsu Province key laboratory of Modern Optical technology soochow university suzhou c.ina 215006 c The 60th Institute of General Staff of the PLA Nanjing c.ina 210016

To alleviate the difficulty of ion beam etching, it is essential to acquire the low gradient holographic photoresist grating masks as well as the high gradient ones （i.e. the rectangular holographic photoresist grating masks）. According to the ion beam etching experiments, the low gradient photoresist grating masks can effectively eliminate the redeposition. The control of the profile of holographic photoresist grating masks is investigated in this paper. considering the effects of developing time and temperature of the developer on the response of photoresist and adopting the combination of computer simulation and experiments, a low gradient photoresist grating mask: 30% duty cycle at bottom and 65° gradient can be fabricated. The study indicates the increase of the developing time causes the diminish of the threshold volume of exposure while the increase of the slope of the linearity of photoresist response;the rise of the temperature of the developer leads to both the increase of the threshold volume of exposure and the slope of the linearity of photoresist response. As a result non-1:1 interferential exposure and low-temperature development are required in the fabrication of low gradient photoresist grating masks. The 1:7 interferential exposure and 15℃-development have been adopted in this experiment.

关键词： Diffractive optics holography photoresist grating masks the control of the profile

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屏幕取词原理与实现

计算机工程与应用 2004年第28期40卷 109-112页

作者：顾平刁红军苏州大学纵横汉字信息技术研究所苏州215006

文章描述了通过截获系统API,实现WindowsNT内核(包括NT、2000、XP)屏幕取词的方法。以一个屏幕取词应用的具体实现为主线,对实现屏幕取词的关键技术———截获API(APIHook)——进行了详细的分析。其中涉及的相关技术有Windows内存结构... 详细信息

文章描述了通过截获系统API,实现WindowsNT内核(包括NT、2000、XP)屏幕取词的方法。以一个屏幕取词应用的具体实现为主线,对实现屏幕取词的关键技术———截获API(APIHook)——进行了详细的分析。其中涉及的相关技术有Windows内存结构与管理、设备上下文、动态链接库和Windows挂钩等。

关键词：屏幕取词截获API Windows挂钩