| 摘要 |
A method and apparatus are provided for determining or estimating the focal length of a camera based on a series of images captured by the camera. In one embodiment, a method for determining focal length includes obtaining a plurality of images of a three-dimensional scene from the camera, matching feature points across a subset of the images, deriving a projective reconstruction from the feature point matching, and finally recovering a metric reconstruction from the projective reconstruction in accordance with semidefinite programming. Once the metric reconstruction is recovered, the camera's intrinsic parameters, including focal length, can be estimated.
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