查询词典 projection method

By analytic geometry method and solving quadratic equation,a computer simulation algorithm of digital projection under arbitrary scanning locus was proposed.The algorithm is based on the rules of attenuation of monochromatic X-rays.Through mathematical modeling and computer simulation,digital projections of ellipsoid and cylinder in circular and helix scanning modes are exemplified respectively,which are proved to be correct by FDK and PI-line reconstruction algorithms.

介绍了一种利用解析几何和求解二次方程仿真任意扫描轨迹下的锥束射线投影数据算法，该方法基于单色射线贯穿物体的衰减理论，通过数学建模与计算机仿真，给出了椭球、圆柱两种典型模型分别在单圆、螺旋线扫描轨迹下的投影数据仿真结果，并利用FDK和PI线重建算法进行验证，证明了该种数值仿真方法的正确性。

The circular projection transformation is a method of feature extraction that has scale, rotation, and translation invariance.

圆周投影变换是一种具有尺度、旋转、平移不变性的特征提取方法。

The roundness of grit's projection was assessed by minimum circumcircle method.

以最小外接圆法评定了金刚石颗粒投影的圆度。

B A new method for describing the projection of a line in an omni-image as a conic section is proposed.

b我们提出了一个利用圆锥曲线来描述环场影像中的直线投影的新方法。

Keywords Closed convex cone;gradient projection method;Least-squares solution;Inverse matrix problem;Inverse eigenvalue problem;Matrix completion problem;Optimal approximation

Article From 湖南大学；应用数学博士论文 2005年度闭凸锥；投影梯度法；最小二乘解；矩阵反问题；矩阵逆特征值问题；矩阵完全化；最佳逼近

A new method using convex optimization and projection is proposed to design the low-order cont roller.

提出一种将凸优化算法和投影原理相结合的降阶控制器设计新方法。

A set of ideal ECP maps for different cubic crystals was theoretically delineated by using the sterographical projection method of crystal planes.

采用晶面的极射赤面投影方法，从理论上绘制了一套不同立方晶体的理论电子通道图。

A projection method is used to smooth out start and end points of the ruling line sets. With predefined Euclidean 6 space distances, the problem of ruled surface approximation from line sets in Euclidean 3 space can be converted into a least square B-spline curve fitting issue in Euclidean 6 space.

利用"投影"光顺法对齐直母线段族首末端点，再通过定义欧氏6空间下的距离函数，将欧氏3空间下的直线族逼近直纹面问题转换成欧氏6空间下B样条曲线最小二乘拟合问题。

Finally, the proposed fully second order accurate projection method on nonstaggered grids is extended successfully to curvilinear coordinates and moving mesh cases.

最后，本文提出的非交错网格上的完全二阶精度的投影方法，在一般坐标系和动网格中到了成功的应用。

The ability to shift your awareness into different parts of your body like this is VITAL to energy work and this projection method.

这种转移你的知觉至你身体的不同部位的能力就像这是对于能量工作和这种投射方法是至关重要的。

Now he worked in ajoint venture.

现在他在一家合资企业工作。

More troops in Afghanistan won't change any of the foregoing.

更多的在阿富汗的军队也不会改变之前的状况。