本文论述了离散点集与连续物体的投影重构的不同性质。对于离散点集,只要少数几个投影便能唯一地重构出物体。对于连续物体,投影的必要数目与物体中可分辨的单元数成正比,并且投影上采样的数目与投影数有相互独立的要求。另外,还对点编码图像的纵向分辨能力作了讨论。

The reconstruction properties of the dilute objects are different from the extended objects. The dilute objects can be reconstructed from a few of projections. In the case of the extended objects, the projection number needed for reconstruct is proportional to the number of resolvable elements. And the projection number cannot be decreased by means of augmenting sampling points in each projection. The depth resolution of the dot coded imaging is discussed as well.