象素格点上深度图象的空间仿射变换

SPACE AFFINE TRANSFORMATION OF A DEPTH IMAGE AT PIXEL POINTS

一般仿射变换涉及3维空间的平移、缩放和旋转操作.对于栅点上抽样所获的深度图,这类变换往往产生一个严重畸变的图象格栅.本文引入一种基于交点追踪的重新抽样方法,可以提供变换后所需规则栅点上精确的距离信息.文中最后给出了牙齿模型深度图实施所述变换的几个例子.

A general affine transformation involves translation,scaling and rotation operations in three dimensionalspace.For a depth image obtained by sampling at grid points,the mapping generates a grid that is usuallystrongly deformed.We introduce a re-sampling method based on intersecting—point—finding that pro-vides exact range data at desired regular grid points.Finally we give several examples of the mapping to adepth image of a tooth model.