posted on 2008-07-01, 00:00authored byJean-Francois Lalonde, Srinivasa G. Narasimhan, Alexei A Efros
We present a novel technique to determine camera parameters when
the sun is visible in an image sequence. The technique requires a user
to label the position of the sun in a few images. We show that it can be
used to successfully recover the camera focal length, as well as its azimuth
and zenith angles. The method is thoroughly evaluated on synthetic data
under a wide range of operating conditions, and representative examples
are shown on real data. Ground truth parameters can be recovered with
less than 3% error in challenging cases.