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Clifford代数几何不变量3D医学图像配准的方法 被引量:3
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作者 华亮 丁立军 +2 位作者 黄宇 冯浩 顾菊平 《计算机科学》 CSCD 北大核心 2014年第6期304-308,共5页
就3D医学图像配准数据量大、计算复杂度高、配准精度低的问题,提出一种基于Clifford代数几何不变量的配准方法,以实现人头颅部3D医学图像配准。提出配准所需的Clifford代数几何不变量及其Clifford代数方程算式,并构造适合于该几何参考... 就3D医学图像配准数据量大、计算复杂度高、配准精度低的问题,提出一种基于Clifford代数几何不变量的配准方法,以实现人头颅部3D医学图像配准。提出配准所需的Clifford代数几何不变量及其Clifford代数方程算式,并构造适合于该几何参考轴旋转的Clifford几何旋转算子,利用所求的最大、最小值对应的Clifford几何不变量建立Clifford旋转算子,对浮动影像数据实现几何变换,以达到配准的结果。配准实验中对两个世界著名的3D医学数据集进行了测试,结果表明:该方法计算简单,几何意义直观,配准精度高,执行效率高,并且通过轴线变换不易陷入配准过程的局部极值点。 展开更多
关键词 clifford代数 几何不变性 3D医学图像配准 几何旋转算子
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基于ROI及Clifford代数相对不变量的3D医学图像配准 被引量:3
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作者 华亮 程天宇 +1 位作者 顾菊平 俞钶安 《图学学报》 CSCD 北大核心 2017年第1期90-96,共7页
在利用颅骨轮廓几何特征配准基础上,提出配准前颅部图像的感兴趣区(ROI)圈定,并在Clifford代数框架下给出一种全新的相对不变量构造方法。该方法以颅部ROI的轮廓数据作为配准点云集,根据颅骨刚体轮廓相似性特点,运用Clifford代数构造相... 在利用颅骨轮廓几何特征配准基础上,提出配准前颅部图像的感兴趣区(ROI)圈定,并在Clifford代数框架下给出一种全新的相对不变量构造方法。该方法以颅部ROI的轮廓数据作为配准点云集,根据颅骨刚体轮廓相似性特点,运用Clifford代数构造相对几何不变量的数学模型及计算模型,并计算配准几何运算需求的平移量和旋转算子,采用3D医学图像的相似性测度直接进行三维数据的配准。数据源及评估使用Brain Web数据库和美国Vanderbilt大学的"回顾性图像配准评估"项目数据。实验表明,新方法在颅部的ROI区域进行配准,能够精确的定位组织器官的三维位置,执行效率高,配准均值误差在2~4 mm内,达到亚像素级配准精度。 展开更多
关键词 医学图像配准 clifford代数 相对不变量 感兴趣区域
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关于Clifford交比及其应用
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作者 蒋月评 《湖南大学学报(自然科学版)》 EI CAS CSCD 1993年第2期21-25,共5页
本文定义了Clifford交比,得到了n维空间的同胚为保向Mobius变换的充要条件和n维空间中四点共圆(或直线)的充要条件,并证明了Clifford交比的实部是n维保向Mobius变换的一个不变量.
关键词 交比 clifford代数 MOEBIUS变换
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SOME PROPERTIES OF HOLOMORPHIC CLIFFORDIAN FUNCTIONS IN COMPLEX CLIFFORD ANALYSIS 被引量:2
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作者 库敏 杜金元 王道顺 《Acta Mathematica Scientia》 SCIE CSCD 2010年第3期747-768,共22页
In this article, we mainly develop the foundation of a new function theory of several complex variables with values in a complex Clifford algebra defined on some subdomains of C^n+l, so-called complex holomorphic Cli... In this article, we mainly develop the foundation of a new function theory of several complex variables with values in a complex Clifford algebra defined on some subdomains of C^n+l, so-called complex holomorphic Cliffordian functions. We define the complex holomorphic Cliffordian functions, study polynomial and singular solutions of the equation D△^mf= 0, obtain the integral representation formula for the complex holo-morphic Cliffordian functions with values in a complex Clifford algebra defined on some submanifolds of C^n+1, deduce the Taylor expansion and the Laurent expansion for them and prove an invariance under an action of Lie group for them. 展开更多
关键词 Complex clifford algebra holomorphic cliffordian functions Taylor expansion Laurent exnansion invariANCE
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A Wave Equation including Leptons and Quarks for the Standard Model of Quantum Physics in Clifford Algebra 被引量:1
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作者 Claude Daviau Jacques Bertrand 《Journal of Modern Physics》 2014年第18期2149-2173,共25页
A wave equation with mass term is studied for all fermionic particles and antiparticles of the first generation: electron and its neutrino, positron and antineutrino, quarks u and d with three states of color and anti... A wave equation with mass term is studied for all fermionic particles and antiparticles of the first generation: electron and its neutrino, positron and antineutrino, quarks u and d with three states of color and antiquarks and . This wave equation is form invariant under the group generalizing the relativistic invariance. It is gauge invariant under the U(1)×SU(2)×SU(3) group of the standard model of quantum physics. The wave is a function of space and time with value in the Clifford algebra Cl1,5. Then many features of the standard model, charge conjugation, color, left waves, and Lagrangian formalism, are obtained in the frame of the first quantization. 展开更多
关键词 invariance Group Dirac Equation Electromagnetism Weak INTERACTIONS Strong INTERACTIONS clifford ALGEBRAS
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Three Clifford Algebras for Four Kinds of Interactions 被引量:1
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作者 Claude Daviau Jacques Bertrand 《Journal of Modern Physics》 2016年第9期936-951,共16页
Three Clifford algebras are sufficient to describe all interactions of modern physics: The Clifford algebra of the usual space is enough to describe all aspects of electromagnetism, including the quantum wave of the e... Three Clifford algebras are sufficient to describe all interactions of modern physics: The Clifford algebra of the usual space is enough to describe all aspects of electromagnetism, including the quantum wave of the electron. The Clifford algebra of space-time is enough for electro-weak interactions. To get the gauge group of the standard model, with electro-weak and strong interactions, a third algebra is sufficient, with only two more dimensions of space. The Clifford algebra of space allows us to include also gravitation. We discuss the advantages of our approach. 展开更多
关键词 GEOMETRY invariance Group Dirac Equation Electromagnetism Weak Interactions Strong Interactions clifford Algebras GRAVITATION
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Relativistic Gauge Invariant Wave Equation of the Electron-Neutrino
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作者 Claude Daviau Jacques Bertrand 《Journal of Modern Physics》 2014年第11期1001-1022,共22页
With the right and the left waves of an electron, plus the left wave of its neutrino, we write the tensorial densities coming from all associations of these three spinors. We recover the wave equation of the electro-w... With the right and the left waves of an electron, plus the left wave of its neutrino, we write the tensorial densities coming from all associations of these three spinors. We recover the wave equation of the electro-weak theory. A new non linear mass term comes out. The wave equation is form invariant, then relativistic invariant, and it is gauge invariant under the U(1)×SU(2), Lie group of electro-weak interactions. The invariant form of the wave equation has the Lagrangian density as real scalar part. One of the real equations equivalent to the invariant form is the law of conservation of the total current. 展开更多
关键词 invariANCE Group Dirac Equation Weak Interactions GAUGE invariANCE Electron NEUTRINO clifford ALGEBRAS Magnetic MONOPOLE
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Extended Relativistic Invariance, Quantization of the Kinetic Momentum
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作者 Claude Daviau Jacques Bertrand 《Journal of Modern Physics》 2020年第9期1263-1278,共16页
The aim of this research is a better understanding of the quantization in physics. The true origin of the quantization is the existence of the quantized kinetic momentum of electrons, neutrinos, protons and neutrons w... The aim of this research is a better understanding of the quantization in physics. The true origin of the quantization is the existence of the quantized kinetic momentum of electrons, neutrinos, protons and neutrons with the <img src="Edit_6224bcbf-d22a-433a-9554-e7b4c49743ed.bmp" alt="" /> value. It is a consequence of the extended relativistic invariance of the wave of fundamental particles with spin 1/2. This logical link is due to properties of the quantum waves of fermions, which are functions of space-time with value into the <img src="Edit_21be84cf-f75c-41c3-ba66-4067f1da843a.bmp" alt="" /> and End(<em>Cl</em><sub>3</sub>) Lie groups. Space-time is a manifold forming the auto-adjoint part of <img src="Edit_b4b9925e-1f73-4305-b3ba-060a6186ffb0.bmp" alt="" />. The Lagrangian densities are the real parts of the waves. The equivalence between the invariant form and the Dirac form of the wave equation takes the form of Lagrange's equations. The momentum-energy tensor linked by Noether's theorem to the invariance under space-time translations has components which are directly linked to the electromagnetic tensor. The invariance under <img src="Edit_b4b9925e-1f73-4305-b3ba-060a6186ffb0.bmp" alt="" style="white-space:normal;" /> of the kinetic momentum tensor gives eight vectors. One of these vectors has a time component with value <img src="Edit_6224bcbf-d22a-433a-9554-e7b4c49743ed.bmp" alt="" style="white-space:normal;" />. Resulting aspects of the standard model of quantum physics and of the relativistic theory of gravitation are discussed. 展开更多
关键词 Geometry invariance Group Dirac Equation Electromagnetism Weak Interactions Strong Interactions clifford Algebras GRAVITATION QUANTIZATION
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共形空间Q_1^(n+1)中类空超曲面的拼挤问题
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作者 聂昌雄 《数学年刊(A辑)》 CSCD 北大核心 2015年第1期31-36,共6页
通过对第二共形基本形式的模长平方作拼挤,给出Clifford超柱面的一个共形特征.
关键词 正则超曲面 共形不变量 Blaschke全脐超曲面 极大超曲面 clifford超柱面
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Towards the Unification, Part 2: Simplified Equations, Covariant Derivative, Photons 被引量:1
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作者 Claude Daviau Jacques Bertrand Dominique Girardot 《Journal of Modern Physics》 2016年第16期2398-2417,共21页
We continue the study of the Standard Model of Quantum Physics in the Clifford algebra of space. We get simplified mass terms for the fermion part of the wave. We insert the simplified equations in the frame of Genera... We continue the study of the Standard Model of Quantum Physics in the Clifford algebra of space. We get simplified mass terms for the fermion part of the wave. We insert the simplified equations in the frame of General Relativity. We construct the electromagnetic field of the photon, alone boson without proper mass. We explain how the Pauli principle comes from the equivalence principle of General Relativity. We transpose in the frame of the algebra of space the second quantification of the electromagnetic field. We discuss the changes introduced here. 展开更多
关键词 BOSON clifford Algebra Dirac Equation Electromagnetism Electron GRAVITATION Magnetic Monopole Neutrino Photon QUARK Relativistic invariance Strong Interactions Weak Interactions
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Scientific Community and Remaining Errors, Physics Examples
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作者 Claude Daviau Jacques Bertrand 《Journal of Modern Physics》 2018年第2期250-258,共9页
The scientific community controls the possible errors by a rigorous process using referees. Consequently the only possible errors are very few, they come from what anyone considers obviously true. Three of these error... The scientific community controls the possible errors by a rigorous process using referees. Consequently the only possible errors are very few, they come from what anyone considers obviously true. Three of these errors are pointed here: the main one is the belief that any quantum state follows a Schr&ouml;dinger equation. This induces two secondary errors: the impossibility of magnetic charges and the identification between the Lorentz group and SL (2, C). 展开更多
关键词 invariance Group Schrodinger Equation Dirac Equation Electromagnetism Weak Interactions Strong Interactions clifford Algebra Magnetic Monopole
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Towards the Unification of All Interactions (The First Part: The Spinor Wave)
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作者 Claude Daviau Jacques Bertrand Dominique Girardot 《Journal of Modern Physics》 2016年第12期1568-1590,共23页
For the unification of gravitation with electromagnetism, weak and strong interactions, we use a unique and very simple framework, the Clifford algebra of space . We enlarge our previous wave equation to the general c... For the unification of gravitation with electromagnetism, weak and strong interactions, we use a unique and very simple framework, the Clifford algebra of space . We enlarge our previous wave equation to the general case, including all leptons, quarks and antiparticles of the first generation. The wave equation is a generalization of the Dirac equation with a compulsory non-linear mass term. This equation is form invariant under the group of the invertible elements in the space algebra. The form invariance is fully compatible with the gauge invariance of the standard model. The wave equations of the different particles come by Lagrange equations from a Lagrangian density and this Lagrangian density is the sum of the real parts of the wave equations. Both form invariance and gauge invariance are exact symmetries, not only partial or broken symmetries. Inertia is already present in the part of the gauge group and the inertial chiral potential vector simplifies weak interactions. Relativistic quantum physics is then a naturally yet unified theory, including all interactions. 展开更多
关键词 Electromagnetism Weak Interactions Strong Interactions GRAVITATION clifford Algebra Dirac Equation Lagrangian Formalism Gauge Groups Relativistic invariance Electron Magnetic Monopole QUARK Photon Gauge Boson Unification
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