A recursive fuzzy systemfor efficient digital image stabilization

Authors:
Nikolaos Kyriakoulis;Antonios Gasteratos
Affiliations:
Department of Production and Management Engineering, School of Engineering, Democritus University of Thrace, Xanthi, Greece;Department of Production and Management Engineering, School of Engineering, Democritus University of Thrace, Xanthi, Greece
Venue:
Advances in Fuzzy Systems - Regular issue
Year:
2008

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Abstract

A novel digital image stabilization technique is proposed in this paper. It is based on a fuzzy Kalman compensation of the global motion vector (GMV), which is estimated in the log-polar plane. The GMV is extracted using four local motion vectors (LMVs) computed on respective subimages in the log-polar plane. The fuzzy Kalman system consists of a fuzzy system with the Kalman filter's discrete time-invariant definition. Due to this inherited recursiveness, the output results into smoothed image sequences. The proposed stabilization system aims to compensate any oscillations of the frame absolute positions, based on the motion estimation in the log-polar domain, filtered by the fuzzy Kalman system, and thus the advantages of both the fuzzy Kalman system and the log-polar transformation are exploited. The described technique produces optimal results in terms of the output quality and the level of compensation.