Motion estimation: the concept of velocity bandwidth

Regis J. Crinon; Wojciech J. Kolodziej

doi:10.1117/12.131368

1 November 1992 Motion estimation: the concept of velocity bandwidth

Regis J. Crinon, Wojciech J. Kolodziej

Proceedings Volume 1818, Visual Communications and Image Processing '92; (1992) https://doi.org/10.1117/12.131368
Event: Applications in Optical Science and Engineering, 1992, Boston, MA, United States

Abstract

This paper shows that like spatial and temporal frequencies, velocity is subject to aliasing. The analysis is based on studying a two dimensional sinusoidal signal moving at constant velocity. It is shown that given the spatio-temporal grid used to sample the image, displacement of a sinusoidal signal must remain confined to a well defined two dimensional domain to avoid velocity aliasing. Analytical derivations to the aliasing-free domains are provided for various sampling lattices such as the rectangular field-interlaced and offset field-interlaced (quincunx) sampling grids. The paper concludes with a few suggestions regarding how the concept of velocity bandwidth can be helpful in the estimation of object displacement in digital video sequences. In particular, bounds for the search domains use in multiscale block matching- based motion estimation algorithms are derived.

Citation Download Citation

Regis J. Crinon and Wojciech J. Kolodziej "Motion estimation: the concept of velocity bandwidth", Proc. SPIE 1818, Visual Communications and Image Processing '92, (1 November 1992); https://doi.org/10.1117/12.131368

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