Structure from motion

Structure from motion

In computer vision, structure from motion refers to the process of finding the three-dimensional structure by analyzing the motion of an object over time.

Humans perceive a lot of information about the three-dimensional structure in their environment by moving through it. When the observer moves and the objects around him move, information is obtained from images sensed over time. [cite book | title = Computer Vision | author = Linda G. Shapiro, George C. Stockman | publisher = Prentice Hall | year = 2001 | ISBN = 0-13-030796-3 ]

Finding structure from motion presents a similar problem as finding structure from stereo vision. In both instances, the correspondence between images and the reconstruction of 3D object needs to found.

To find correspondence between images, features such as corner points (edges with gradients in multiple directions) need to be tracked from one image to the next. The feature trajectories over time are then used to reconstruct their 3D positions and the cameras motion. [cite Journal | journal = IEEE Computer Society Conference on Computer Vision and Pattern Recognition | title = Structure from Motion without Correspondence | author = F. Dellaert, S. Seitz, C. Thorpe, and S. Thrun | year = 2000 | url = http://www.ri.cmu.edu/pub_files/pub2/dellaert_frank_2000_1/dellaert_frank_2000_1.pdf ]

Structure from motion is related to the kinetic depth effect in perception whereby subjects viewing the shadow cast by a wire frame or other structure in rotation, perceive the full three-dimensional structure of the object, whereas when viewing the shadow of a static object they perceive only its two-dimensional projection.

ee also

* Motion field

Further reading

* cite book
author=Richard Hartley and Andrew Zisserman
title=Multiple View Geometry in Computer Vision
publisher=Cambridge University Press
year=2003
id=ISBN 0-521-54051-8

* cite book
author=Olivier Faugeras and Quang-Tuan Luong and Theodore Papadopoulo
title=The Geometry of Multiple Images
publisher=MIT Press
year=2001
id=ISBN 0-262-06220-8

References


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