Motion estimation is the process of determining motion vectors that describe the transformation from one 2D image to another; usually from adjacent frames in a video sequence. It is an ill-posed ...

For the unique characteristics of space object images: lack of texture, scale variation due to changes in imaging distance, and complexity of the background. In this paper, a spatial non-cooperative ...

So first his system renders a 3D reconstruction of the 2D image in very low resolution. You can still get a lot from that — for example, that the outer third of the whole volume appears to be empty.