投影

First, by using the properties of knots and the Jones polynomial, we research the relation between them, thereby involving in the projection diagram with n crossings, discuss the state S of the projection diagram L , through the properties of vertexgraph, Euler Formula, one studied the problem of the equal of the knots.

首先，我们利用纽结及琼斯多项式的性质研究了它们的关系，进而涉及了有n个交叉点的纽结投影图，对其投影图L的状态S进行讨论，并通过四岔地图，欧拉公式等性质，研究了纽结等价性问题。

Vessel overlapping and foreshortening in angiographic images may cause errors in quantitative coronary analysis QCA such as determination of vessel stenosis during clinic diagnosis , and can be influenced by the angiographic views .

在冠心病的临床诊断中，血管的遮盖和投影缩短会引起血管狭窄等的定量分析错误，而血管遮盖与投影缩短与造影角度的选择有关。

The image information storing means provides a vector data storing means which stores vector data of an original drawing, and a vector data projecting means which projects the vector data to four kinds of coordinate systems.

图象信息存储器提供存储原始绘图向量数据的向量数据存储器，和将向量数据投影到四种坐标系中的向量数据投影器。

Goldschmidt s gnomonic projection,a method of comparison with line and face about the identified visibility of the crystal face on gnomonic plane is given to search hidden line of mineral crystal shape.

根据图形消隐的基本原理，针对心射极平投影的特点，使用线、面比较法在极平投影面上判断晶面的可见性，进而消除矿物晶体形态图中的隐藏线。

In order to get the locations of the eyes, two methods are implemented, Morphological transformation algorithm and Grayness integral projection algorithm. The precision and time cost for the two methods are compared and the latter is better for our system.

在眼睛定位方面，采用了两种实时性较高的算法，形态学方法和积分投影法，对这两种算法在准确率和检测耗时方面进行比较后，确定采用积分投影法。

Keywords : AFSA;neural network;coupling regress model of projection pursuit;projection direction;threshold;Hermite polynomial

应用神经网络的投影寻踪耦合回归模型存在优化问题，学习过程中运用人工鱼群算法进行优化，进而获得最佳的投影方向、阈值和正交Hermite多项式系数。

This method, through automatic removingthe hidden lines by the computers, separates the visible plane and invisible plane,we only project the former, thus it can be c...

该方法是经过计算机自动消隐后；将可见面与不可见面分离开来，只对前者进行投影，因而可称之为"可见面投影法"。

First, an initial projection matrix is obtained through homography between an image and a scene plane. The homograph matrix between two images, i. e., the image plane and the scene plane, can then be calculated from matching points of these two images. Thus the projection matrix of every next frame can be calculated from homograph matrix between the current image plane and the previous one. Registration of virtual objects is finally completed.

根据这个原理，首先通过一个景物平面和图像之间的单应得到初始状态相机的投影矩阵，然后对后面每帧图像和前一帧进行自然特徵点匹配，通过匹配点对计算出图像之间以及图像与景物平面的单应关系，由此就可以得到每一帧图像对应的相机的投影矩阵，从而完成虚拟物体的注册。

The determination of projective coordinates in different reference ellipsoid ,which is with the transform between Ellipsoid elements in different reference ellipsoid ,gets the Coordinates in corresponding new Ellipsoid,and finally projects to horizontal coordinates.

位于不同参考椭球面下投影面坐标的求解，是通过不同参考椭球间椭球元素的转换，求得对应的新椭球体上的大地坐标，最后投影至平面坐标。

The use of level detection projection plates horizontal position, using vertical projection method detection plates vertical position.

利用水平投影法检测车牌水平位置，利用垂直投影法检测车牌垂直位置。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。