音标与读法

这里为大家介绍下cross ratio 是什么意思，希望能帮助到各位朋友。

中英文翻译

交比，非调和比，重比。

cross:n. 克罗斯〔姓氏〕。 ratio:n. (pl. ratios) 1.比，比率，比值；比例 ...

例句与用法

1.The cross ratio he called anharmonic ratio .

他把交比叫作非调和比。

2.Desargues proved that the cross ratio is the same for every section of the projection .

Desargues证明了投射线的每个截线上的交比都相等。

3.Desargues proved that the cross ratio is the same for every section of the projection

Desargues证明了投射线的每个截线上的交比都相等。

4.A camera calibration method with co - line points is proposed , in which distortion center is located according to cross ratio invariability , and then distortion coefficients are calculated based on a line " s central projection is a line

摘要提出一种用共线点列标定摄像机镜头畸变参数的方法，先根据交叉比不变性确定畸变中心，再利用直线的中心投影仍为直线这一性质确定畸变系数。

5.On the stage of describing the shape of airplane and extracting feature , we derive five - coplanar - point invariant from the basic projective invariant - cross ratio , and resolve the problem of stabilization of five - coplanar - point when there is three points are nearly collinear

在对飞机外型提取特征进行描述的阶段，首先从基本的射影不变量交比不变量出发，推导出了平面五点不量，并解决了当有三点接近共线时不变量不稳定的问题。

6.In the self - calibration scheme , the thesis emphasizes the accuracy of camera intrinsic and extrinsic parameters . we presents an accurate f method based on corresponding point adjustment . the method adjusts coresponding points according to the fixedness of projective transformed cross ratio , then calculates f matrix accurately through linear and non - linear methods . when computing intrinsic parameter , a matrix , we simplify the step , and stress on the two important parameters of a . the result will be getten through solving kruppa equation based on svd decomposition . in order to compute extrinsic parameters , we use linear method to get initial r and t , then apply non - linear method to accurate them

提出了基于匹配点调整的f求精方法，先根据摄影交比不见性对手工选择的匹配点进行调整，再用线性、非线性结合的方法求精f矩阵；在计算内部参数a中，进行了一定的简化，把重心放在a中重要的两个参数上，用svd分解法计算kruppa方程；在计算外部参数时，首先用线性法求解r 、 t ，然后再用非线性法迭代求精。

7.Based on projective geometry , the research works about 3d invariance " s extraction and application have been done in this thesis as following : ( 1 ) the basic theories and concepts in projective geometry are systematically summarized . it includes : the camera models of perspective imaging , projective collineation , cross ratio , a simple compare about invariance ( invariant ) among some geometry transformations , fundamental matrix , epipolar and epipolar line in epipolar geometry , and so on . ( 2 ) the calculation methods for 2d projective transformation are extended from points to multi - element , which includes points , lines , points lines and so on , to get the relationship between two projective planes

基于射影几何理论，论文围绕3d不变特征的提取和应用进行了如下的研究工作： ( 1 )系统总结了射影几何中的若干基础概念，包括：透视成像的相机模型、射影对应、交比不变量、基于不同几何变换下的不变量的简单对比、对极几何中的基础矩阵、对极点、对极线等。

单词网DaNCi.583316.CoM