坐标变换

When a few of local 3D terrain models have been reconstructed respectively,firstly find the common 3D points between every two adjacent local models based on edge detection and image matching,secondly fit the matrix of coordinate transformation employing the technique of separating rotation matrix and translate vector,and lastly register these local 3D models into a single coordinate system.

当恢复出多个局部3D地形模型时，首先基于边缘检测和图像匹配技术提取出相邻局部模型之间的公共数据点，然后采用分离旋转变换和平移矢量的策略拟合出相邻模型之间的坐标转换关系，之后就可以将局部模型统一在同一个坐标系下。

The technique of boundary-fitted coordinate system is used to overcome the difficulties resulting from the complicated shapes of natural river boundaries;the method of alternating direction implicit finite difference scheme is used to solve the partial differential equations in the transformed plane;and the technique of moving boundary is used to deal with the river bed exposed to water surface.

用适体坐标技术克服天然河道复杂的几何边界给有限差分法所带来的困难；用交替方向隐式有限差分格式求解变换平面上的偏微分方程；用动边界技术处理河床的淹露。

Feature of principal lines spatial distribution: detect the principal lines through edge detecting technology, and then divide the image of palmprint into blocks with same dimension, compute the mean and variance as feature; Feature of palmprint direction: divide the image into sub-images; compute the max angle of projection and coordinate of each sub-image, which stand for the direction and location of the line on the palm; Feature of moment invariants: compute the moment invariants of each sub-image and the whole image as feature.

掌纹主线空间分布特征：利用边缘检测技术检测出掌纹的主线，将图像分割成相同大小互不重叠的子图，提取每一个子图的均值和方差作为特征；掌纹线方向特征：将图像分成不重叠的子图，利用Radon变换求出每一个子图的最大投影角度和坐标，也就是子图内掌纹线的方向和位置，构造特征向量；掌纹不变矩特征：提取图像整体和分割后的子图的不变矩作为特征。

Using axonometric projection method ,the computer si mulation of the di mensional electrostaticfieldis realized through the planar projection transformation of three-di mensional coordinate.

采用轴测投影法，通过三维坐标的二维投影变换，实现空间静电场的计算机模

WGS-84 geodetic latitude and longitude from GPS was projected by similarity transformation method, and they were transformed coercively to realize coordinate matching.

并用相似变换法将GPS接收到的WGS-84大地经纬度高斯投影后强制转换统一，以实现坐标匹配。

The tomatoes" image was analyzed, their surface features were extracted, and each tomato was discriminated using the method of particle segmentation by watersheds; a template based profile emendation method is advanced in which three typical profiles of tomato images are adopted; the coordinates of tomato"s central point are obtained; three constraint conditions are advanced and bias ranges are properly selected to match feature points in conjugate images.

对番茄图像进行分析，提取番茄的轮廓特征，采用分水岭变换法实现多果分割；提出三个典型的番茄图像轮廓为模板实现轮廓信息的补全和修复；提取番茄的形心坐标。

Using the rotational coordinate axis, the complex multi-swing process can be studied on simple one-dimensional axis.

通过旋转一维坐标轴，复杂多机电力系统摇摆过程通过投影变换可以转化为一维坐标上简单运动来研究。

The author then introduces the differential relationship between vectors as well as tensors in a curve coordinate system and curve coordinates, and the transformation relationship between coordinate systems and their matrix expressions.

简要介绍了卫星重力测量中所涉及到的曲线坐标系下矢量、张量与曲线坐标之间的微分关系、坐标系之间的变换关系以及它们的矩阵表示。

Aiming at shadow influence problem in vision navigation process of agricultural robot, illumination invariant image based on shadow removal algorithm was introduced. An enhanced OSTU image segmentation method was used, and an optimized Hough transformation algorithm was used to extract crop line, and coordinate transform was applied to obtain navigation parameters.

该研究针对农业机器人视觉导航中存在的阴影干扰问题，采用基于光照无关图的方法去除导航图像中的阴影，然后采用增强的最大类间方差法进行图像分割和优化的Hough变换提取作物行中心线，最终通过坐标转换获得导航参数。

The former applies to those situations that the formulas of two projections are simple and easy to find out the direct relation of the plane rectangular coordinate.

数值变换法应用范围较广，它可以避开较复杂的投影坐标公式的反解问题，求出两个不同投影平面场上点的对应关系。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。