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    • 9. 发明公开
    • Method of synthesizing measurement data of free-form surface
    • 维也纳自治大学
    • EP0898247A2
    • 1999-02-24
    • EP98115196.2
    • 1998-08-12
    • THE INSTITUTE OF PHYSICAL & CHEMICAL RESEARCH
    • Kase, Kiwamu
    • G06T17/30
    • G06T17/30Y02P90/265
    • (a) A surface shape of an object 1 is measured from different positions and/or different directions and plural partial measurement data 2 including common part 1a is obtained. (b) A parametric surface showing the surface shape of each measurement range is formed from the data. (c) A plurality of sampling points are set at a predetermined pitch in the common part and the Gaussian curvature K and/or an average curvature H are calculated from the principal curvatures (κ 1 ,κ 2 ) in the points. (d) Three or more characteristic points are selected in accordance with the order from larger absolute values of K or H in the common part and a normal vector of a plane constructed by three points among the points is calculated. (e) The common parts are made coincide with each other by moving the parametric surfaces so as to coincide the three characteristic points with each other and to coincide the directions of the normal vectors with each other. Consequently, the synthesis data can be formed from the partial measurement data obtained from the free-form surface.
    • (a)从不同的位置和/或不同的方向测量物体1的表面形状,并且获得包括公共部分1a的多个部分测量数据2。 (b)从数据形成表示各测量范围的表面形状的参数表面。 (c)在公共部分中以预定间距设置多个采样点,并且从点的主曲率(kappa1,kappa2)计算高斯曲率K和/或平均曲率H. (d)根据在公共部分中较大的K或H的绝对值的顺序选择三个或更多个特征点,并且计算由点中的三个点构成的平面的法线矢量。 (e)通过移动参数表面使公共部分彼此重合,以使三个特征点彼此重合,并使法向量的方向彼此一致。 因此,合成数据可以由从自由曲面获得的部分测量数据形成。