Geometric Interpretation and Algorithm of the Invariants of A pair of Coplanar Conics
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摘要: 从实际计算的角度出发,研究了两平面二次曲线射影不变量,并对其进行了相应的几何解释,提出了相应的计算方法。首先从两二次型的不变量推导出两平面二次曲线的射影不变量,接着利用两平面二次曲线的共自极三角形给出了两平面二次曲线不变量的几何解释及计算方法。在此基础上,通过举例分析和实验验证,证明文中所给公式的正确性。Abstract: The object recognition based on the invariants is the most active research area in the computer vision. The conventional studies about invariants are that these invariants are derived for planar objects using points and lines from images. Nowadays, more and more interest comes from 3 D reconstruction based on the invariants of conics. The projective invariants of a pair of coplanar conics are studied from the perspective of computational proces-ses and the geometrically interpreted is proposed in this paper. The projective invariants of a pair of eoplanar conics are first defined from invariants of a pair of quadratic forms. Then the invariants are geometrically interpreted by using the common self-polar triangle of the two conics, and the algorithm is proposed in this paper. The result of example shows that this formula in this paper is correct on the basis of present studies.
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Key words:
- computer vision /
- coplanar conics /
- invariant /
- geometric interpretation
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[1] Kim H,Kim J.Region-based shape descriptor invariant to rota-tion scale and translation[J].Signal processing:Image Com-munication,2000,16(1-2):87~93 [2] Rajashekhar S,et al.Image retrieval based on projective ina-varance[A].2004International Conference on Image Pro-cessing[C],2004:405~408 [3] 周秀芝,刘方,王润生.利用局部不变特征识别复杂平面多边形[J].计算机辅助设计与图形学学报,2003,15(7):858~862 [4] Pantuwong N,Chotikakamthorn N.Comparative study of two pro-jective invariant digital watermarking methods using cross-ratios and line intersections[A].Proceedings of the2005The Fifth International Conference on Computer and Information Technology(CIT'05)[C],2005 [5] Nunziati W,Sclaroff S,Bimbo1A D.An Invariant Represen-tation for Matching Trajectories Across Uncalibrated Video Streams[M].Springer-Verlag Berlin Heidelberg,2005 [6] 高文,陈熙霖.计算机视觉[M].北京:清华大学出版社,1998 [7] Meer P,Lenz R,Ramakrishna S.Efficient Invariant Representa-tions[J].International Journal of Computer Vision,1998,26(2):137~152 [8] 刘方,王润生.利用消失点列的射影不变量描述平面直线的关系[J].电子学报,2001,29(9):1188~1191 [9] 陈柘,江泽涛,李世忠,赵荣椿.一种新的几何约束结构及其射影不变量[J].计算机学报,2005,28(10):1740~1744 [10] 吴刚,李道伦.基于隐含多项式曲线仿射不变量的目标识别[J].电子学报,2004,32(12):1987~1991 [11] Craizer M,Lewiner T,Morvan Jean-Marie.Combining points and tangents into parabolic polygons[J].Journal of Mathemat-ical Imaging and Vision,2007,29(2-3):131~140 [12] Jiang G,Tsui Hung-tat,Quan L.Geometry of single axis mo-tions using conic fitting[J].IEEE Transactions on Pattern A-nalysis and Machine Intelligence,2003,25(10):1343~1348 [13] 张政武.空间二次曲线代数不变量的几何解释[J].机械科学与技术,2008,27(12):1670~1672,1676
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