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14 March 2005 Estimating physical camera parameters based on multisprite motion estimation
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Global-motion estimation algorithms as they are employed in the MPEG-4 or H.264 video coding standards describe motion with a set of abstract parameters. These parameters model the camera motion, but they cannot be directly related to a physical meaning like rotation angles or the focal-length. We present a two step algorithm to factorize these abstract parameters into physically meaningful operations. The first step applies a fast linear estimation method. In an optional second step, these parameters can be refined with a non-linear optimization algorithm. The attractivity of our algorithm is its combination with the multi-sprite concept that allows for unrestricted rotational camera motion, including varying of focal-lengths. We present results for several sequences, including the well-known stefan sequence, which can only be processed with the multi-sprite approach.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Dirk Farin and Peter H. N. de With "Estimating physical camera parameters based on multisprite motion estimation", Proc. SPIE 5685, Image and Video Communications and Processing 2005, (14 March 2005); doi: 10.1117/12.587557;

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