1) projection conversion
投影交换
2) orthogonal projection transformation
正交投影变换
3) orthogonal projection pre-transformation
正交投影预变换
1.
Firstly, the jamming jam method(JJM) was extended to 2-D DOA estimation, then an improved algorithm was introduced based on orthogonal projection pre-transformation;the united theory frame for the two algorithms was analyzed;finally the computer simulation results show the DOA estimation performance of the two algorithms.
首先将干扰阻塞(JJM)算法推广至二维DOA估计;然后给出了一种基于正交投影预变换的弱信号测向算法,并且分析了这两种测向算法的统一理论框架;最后通过计算机仿真给出了两种测向算法的性能。
4) projection transformation
投影变换
1.
Application of projection transformation and surface transformation in descriptive geometry;
投影变换剖析及换面法在画法几何中的应用
2.
Application of MAPGIS projection transformation subsystem;
MAPGIS投影变换子系统的应用
3.
It is necessary to learn the method of using projection transformation to train people the ability of spatial imagination.
用投影变换来帮助学习者培养空间想象能力是学习中必用的手段和方法。
5) projective transform
投影变换
1.
Deriving homography matrix of planar projective transform;
二维投影变换模型的单应矩阵表示
2.
Through projective transform method of drawing geometry, a new method to solve parts form error according with the smallest condition is presented.
简述了求解零件形状误差—平面度误差的几种方法，并提出了一种新方法，用画法几何学中的投影变换法来求解符合最小条件的平面度误差，并与解析法进行了比较。
6) projection change
投影变换
1.
This paper suggests that counter thinking and projection change together with various drawing methods could help to find out the full necessary conditions for the conclusion and answer,and that when the counter path is explored,it would be possible to solve some space questions that are difficult to deal with by the normal thinking method.
用投影变换求解空间问题时,应用逆向思维方法与投影变换原理及多种作图方法灵活结合,逆向寻求结论成立、答案存在的充分必要条件,弄清逆向路径,可以解决某些用正向思维方法难以找到求解路径的空间题。
补充资料：滤波反投影或卷积反投影
滤波反投影或卷积反投影
影像学术语。当代影像学设备进行影像重建的数学方法。在直接用扫描后所获得的投影轨迹剖面图反投影重建出的CT图像中，无法避免角度卷入条纹伪影(angular aliasing streaks)造成的模糊和失真。这种现象与被扫描层面的空间频率中高频信息的损失有关。使用一种精密的数学方法去除这种模糊。称为“展现”(unfolding)或去卷积(deconvolution)，即在反投影前使用一种数学的“滤器”或卷积函数对原始数据进行修正，然后再进行反投影。两步数学处理过程合称为滤波(修正后)反投影或卷积(后)反投影。这种方法的优点是处理过程简单，速度快，所得图像逼真、清晰。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条