虚元素 meaning in Chinese

ghost element
imaginary element

The imaginary elements pertain to a condition or state of a figure .
虚元素属于一个图形的某一种情形或状态。
Conjugate imaginary elements
共轭虚元素
In two - view case , a method is presented for calculation 2d projective transformation and construction the virtual elements by combination of spatial points and lines . so more 3d invariants of object ' s spatial structures can be extracted from real elements and virtual eleme nts . ( 3 ) the geometric characteristics of 2d symmetric objects " in perspective images are lucubrated
( 2 )扩展了2d射影变换矩阵的求解方法，将单纯利用点集对应的计算模式扩展到利用直线集、点线组合等多种类型来建立两个射影平面的对应关系；总结了平面上基于点、直线元素可求解的多种3d不变量；提出了双视图下由点、直线元素的多种对应关系求解2d射影变换来构造“虚元素”的方法，结合“实元素”和“虚元素”可以提取更多的空间3d不变量。