1) projection principle
投影原理
1.
Discussion on teaching reformation of architectural drafting s projection principle in vocational college;
高职院校建筑制图中投影原理教学改革探讨
2.
2 in GB/T 17451 -1998 and its relative problems, this thesis expounds the problems in view of projection principle and makes some supplements to the items mentioned above.
2款向视图的定义、标注、图例进行剖析以及对相关问题的研究,从投影原理的层面上进行阐述问题。
2) CT principle
CT反投影原理
3) three-dimensional projection theory
三维投影原理
1.
The three-dimensional projection theory can be utilized to be changed to plane and the hyperspace problem can be located in the same three-dimensional space(viz.
通过例举的图解过程阐述了求多维空间几何元素相交问题,可利用三维投影原理向平面转化,将多维问题定位于同一三维空间(即超平面)内进行求解。
4) velocity projection principle
速度投影原理
5) principle of two plane projection
二面投影原理
1.
The mosaic problem of more satellite photo is studied by using the principle of two plane projection in this paper, mainly considering the problem of geometric compound of two close satellite photo.
利用二面投影原理对卫片的镶嵌问题进行了研究 ,主要考虑两张相邻卫片的几何配准问
6) Sirbat projection principle
希尔伯托投影原理
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。
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参考词条