三维重建是指利用二维投影恢复物体三维信息（形状等）的数学过程和计算机技术。

• 自阴影重建形状（英文：shape from shading）
• 自边界重建形状（英文：shape from silhouette）

Iterative reconstruction refers to iterative algorithms used to reconstruct 2D and 3D images in certain imaging techniques. For example, in computed tomography an image must be reconstructed from projections of an object. Here, iterative reconstruction techniques are a better, but computationally more expensive, alternative to the common filtered back projection (FBP) method, which directly calculates the image in a single reconstruction step.