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Image corner detection using topology learning

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The Journal of China Universities of Posts and Telecommunications 2010年第6期17卷 101-105页

作者： SUN Wei,YANG Xuan College of Computer Science and Software Engineering,shenzhen university,shenzhen 518060,China College of Computer Science and Software Engineering Shenzhen University Shenzhen 518060 China

Image corner detection plays an important role in image analysis and recognition. This paper presents a novel corner detector based on the growing neural gas （GNG） network and this proposed detector is called GNG-C. With the GNG network,image topology information can be learned and used to implement corner detection. The GNG-C approach can be described as consisting of the following steps. First,a canny edge detector is used to acquire the contour information of the input image. This edge information is used to train a modified GNG network. A special stopping criterion is defined to terminate network learning. Second,vectors formed between network nodes and their neighbors are used to measure curvatures. Third,dynamic regions of support （ROS） are determined based on these curvatures. These ROS are used to suppress curvature noise. The curvature values of the nodes are then analyzed to estimate the candidate corners. Finally,the candidates are distilled by a non-maxima suppression process to obtain the final set of corners. Experiments on both artificial and real images show that the proposed corner detection method is feasible and effective.

关键词： corner detection GNG topology learning self-organizing map

Singchia and Gunnaria,two new genera of Orchidaceae

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Journal of Systematics and Evolution 2009年第6期47卷 599-604页

作者： ~(1,2,3)Zhong-Jian LIU~* ~1Li-Jun CHEN 1(The National Orchid Conservation Center of China(The Orchid Conservation & Research Center of shenzhen),shenzhen 518114,China) 2(The Center for Biotechnology and BioMedicine,Graduate School at shenzhen,Tsinghua university,shenzhen 518055,China) 3(College of Forestry,South China Agricultural university,Guangzhou 510642,China) (The National Orchid Conservation Center of China (The Orchid Conservation & Research Center of shenzhen) Shenzhen 518114 China) (The Center for Biotechnology and BioMedicine Graduate School at Shenzhen Tsinghua University Shenzhen 518055 China) (College of Forestry South China Agricultural University Guangzhou 510642 China)

Singchia *** & ***,a new orchid genus,is established based on the new species *** *** & *** found in southeast Yunnan,*** new genus is related to Pteroceras,from which it differs by having a lip with its basal margins immovably adnate to the lower part of the pendent column foot,a thin-walled spur,and very unequally and deeply split pollinia,each with a distinct *** addition to a discussion on Ascocentrum pusillum,a species of questionable placement,another new genus,namely Gunnaria *** ex *** & ***,is set up and a new combination,namely ***(Aver.) *** & ***,is *** new genus Gunnaria differs from its ally Ascocentrum by having a cross-shaped pollinarium,sulcate or split pollinia, each with a distinct caudicle attached to a common linear stipe much longer than either pollinia or viscidium,and strongly incurved side lobes of the lip.

关键词： China G.pusilla(Aver.) Z.J.Liu & L.J.Chen Gunnaria S.C.Chen ex Z.J.Liu & L.J.Chen new combination new genera new species S.malipoensis Z.J.Liu & L.J.Chen Singchia Z.J.Liu & L.J.Chen Yunnan

Multispectral image edge detection via Clifford gradient

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Science China(Information Sciences) 2012年第2期55卷 260-269页

作者： XU Chen2,LIU Hui1,CAO WenMing1 & FENG JiQiang2 1College of Information Engineering,shenzhen university,shenzhen 518060,China 2Institute of Intelligent Computing Science,shenzhen university,shenzhen 518060,China Institute of Intelligent Computing Science Shenzhen University Shenzhen China College of Information Engineering Shenzhen University Shenzhen China

The edge detection of a multispectral image with a mass of image information is theoretically expected to give a more accurate *** algebra is more suitable for processing multidimensional data and expressing the data association than general ***,the basic properties of Clifford algebra are ***,the Clifford algebra description of a multispectral image is ***,a novel multispectral image edge detection algorithm is proposed in terms of the Clifford *** the first two experiments,comparison of the detail achieved by the new algorithm with that from the maximal entropy edge detection algorithm reveals that the edge detection based on Clifford gradient is better at retaining and identifying edge information of the multispectral image than the maximal entropy edge detection *** experiments using tuberculosis CT image show that the new algorithm has clinical value in reducing risk of misdiagnosis.

关键词： multispectral image edge detection Clifford gradient

Stability of Periodic Solutions of Ordinary Differential Equations in Banach Spaces

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Communications in Mathematical Research 1999年第1期 39-45页

作者： Lin Zhuangpeng and Wang Xiaofeng (Department of Mathematics, shenzhen university, shenzhen, 518060)

§１．ＤｅｆｉｎｉｔｉｏｎｓａｎｄＮｏｔａｔｉｏｎｓＬｅｔＥｂｅａｒｅａｌＢａｎａｃｈｓｐａｃｅ，ａｎｄｌｅｔｘ，ｙ∈Ｅ．Ｔｈｅｄｉｒｅｃｔｉｏｎａｌｄｅｒｉｖａｔｉｖｅ［ｘ，ｙ］－ｏｆｘａｎｄｙｉｓｄｅｆｉｎｅｄｂ... 详细信息

§１．ＤｅｆｉｎｉｔｉｏｎｓａｎｄＮｏｔａｔｉｏｎｓＬｅｔＥｂｅａｒｅａｌＢａｎａｃｈｓｐａｃｅ，ａｎｄｌｅｔｘ，ｙ∈Ｅ．Ｔｈｅｄｉｒｅｃｔｉｏｎａｌｄｅｒｉｖａｔｉｖｅ［ｘ，ｙ］－ｏｆｘａｎｄｙｉｓｄｅｆｉｎｅｄｂｙ（ｆｏｒｍｏｒｅｄｅｔａｉｌｓｓ...

关键词： Directional Derivative Periodic Solution Stability

An Efficient Conversion Scheme for Enhancing Security of Diffie-Hellman-Based Encryption

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Wuhan university Journal of Natural Sciences 2010年第5期15卷 415-421页

作者： ZHANG Xi,HANG Huanhua College of Computer and Software,shenzhen university,shenzhen 518060,Guangdong,China College of Computer and Software Shenzhen University Shenzhen Guangdong China

Nowadays,indistinguishability against adaptive chosen-ciphertext attacks（IND-CCA2） has been widely accepted as a proper security criterion for encryption *** this paper,an efficient conversion is proposed to satisfy the IND-CCA2 *** uses the random oracle methodology and the idea of hybrid encryption,and can enhance any Diffie-Hellman based encryption scheme,which is only one-way under plaintext-checking *** with other existing conversions,this conversion has the advantages of short ciphertext and low computation overhead,especially when it is applied to the multi-recipient setting.

关键词： Diffie-Hellman-based encryption adaptive chosenciphertext attack multi-recipient setting randomness-reusing

Advances in theory and applications of fuzzy clustering

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Chinese Science Bulletin 2000年第11期45卷 961-970页

作者： GAO Xinbo & XIE Weixin1. Institute of Electronic Engineering, Xidian university, Xi’an 710071, China 2. President office, shenzhen university, shenzhen 518060, China. Institute of Electronic Engineering Xidian University Xi’an China President office Shenzhen University Shenzhen China

The summarization and evaluation of the advances in fuzzy clustering theory are made in the aspects including the criterion functions, algorithm implementations, validity measurements and applications. Several importa... 详细信息

关键词： cluster analysis fuzzy clustering cluster validity pattern recognition image processing.

Study on Graphic Distortion in Laser Display

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Chinese Journal of Lasers 1999年第6期8卷 30-33页

作者： JIANG Ming  YU Jianhua LUO Xiaoling QIU Junlin  LI Jingzhen (Department of Optoelectronics, shenzhen university, shenzhen 518060, China  The State Key Laboratory of Laser Technology, Huazhong university of Science 深圳大学光电子系广东深圳 518060 华中理工大学激光技术国家重点实验室湖北武汉 430074 华中理工大学激光技术国家重点实验室湖北武汉深圳大学光电子系广东深圳

The mechanism of the graphics distrotion in a laser display system was studied. Based on the mathematical analysis, the pincushion and linear distortions were calculated. Theoretical results agree well with the experimental observation. By tracing laser beams from image plan back to scanners, a relation between the image points on the screen and the scan angles was built. Thus, it has been able to rectify the scanning distortions by computer software effectively.

关键词： laser display graphic distortion optical scanning galvanometer

Ground state properties of La isotopes in reflection asymmetric relativistic mean field theory

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Science China(Physics,Mechanics & Astronomy) 2009年第10期52卷 1574-1578页

作者： WANG Nan1 & GUO Lu2 1 College of Physics,shenzhen university,shenzhen 518060,China 2 Department of Physics,Faculty of Science,university of Tokyo,Tokyo 113-0033,Japan College of Physics Shenzhen University Shenzhen China Department of Physics Faculty of Science University of Tokyo Tokyo Japan

The ground state properties of La isotopes are investigated with the reflection asymmetric relativistic mean field(RAS-RMF) *** calculation results of binding energies and the quadrupole moments are in good agreements with the *** calculation results indicate the change of the quadrupole deformation with the nuclear mass *** "kink" on the isotope shifts is observed at A = 139 where the neutron number is the magic number N = *** is also found that the octupole deformations may exist in the La isotopes with mass number A ～ 145-155.

关键词： reflection asymmetric relativistic mean field(RAS-RMF) theory nuclear deformation binding energy

A new orchid Paphiopedilum guangdongense and its molecular evidence

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Journal of Systematics and Evolution 2010年第5期48卷 350-355页

作者： 1 Li-Jun CHEN 1,2,3Zhong-Jian LIU 4You-Yu LI 1Li-Qiang LI 1(shenzhen Key Laboratory for Orchid Conservation and Utilization,The National Orchid Conservation Center of China/The Orchid Conservation and Research Center of shenzhen,shenzhen 518114,China) 2(The Center for Biotechnology and BioMedicine,Graduate School at shenzhen,Tsinghua university,shenzhen 518055,China) 3(College of Forestry,South China Agricultural university,Guangzhou 510642,China) 4(The Nature Reserve of Dawuling of Guangdong Province,Xinyi 525000,Guangdong,China) (shenzhen Key Laboratory for Orchid Conservation and Utilization The National Orchid Conservation Center of China/The Orchid Conservation and Research Center of Shenzhen Shenzhen 518114 China) (The Center for Biotechnology and BioMedicine Graduate School at Shenzhen Tsinghua University Shenzhen 518055 China) (College of Forestry South China Agricultural University Guangzhou 510642 China) (The Nature Reserve of Dawuling of Guangdong Province Xinyi 525000 Guangdong China)

A new Paphiopedilum entity found in southern Guangdong was studied taxonomically by means of internal transcribed spacer of nuclear ribosomal DNA analysis in addition to morphological and phytogeographical *** entity is similar to Paphiopedilum gratrixianum(Masters)Rolfe morphologically,from which it differs by having narrower leaves not wider than 2 cm and lacking purple spots toward abaxial base,pale green dorsal sepal veined with pale purplish brown and not heavily spotted with purple,and staminode subtruncate and mucronate at *** analysis of internal transcribed spacer sequences of this entity and its allies came to the same conclusion that the entity is a member of Paphiopedilum section Paphiopedilum and closely related to but distinct from *** a result,it is treated here as a new species,Paphiopedilum guangdongense ***&***.

关键词： new species nrITS Orchidaceae Paphiopedilum guangdongense.