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Motion affine models identification and application to television image coding

This paper addresses two-dimensional motion analysis in the context of television image coding and presents a method for achieving the identification of motion models per region in television-like image sequences. The proposed algorithm associates a downward hierarchical image analysis and a differential estimation of the model parameters, where the estimation of the dense velocity field and its approximation by a given model in the sense of weighted least squares are combined in an iterative process. The basic version of the algorithm performs the identification of affine models per block. However, the differential estimation of movement parameters extends straightforwardly to higher order models. Furthermore, the general scheme of the algorithm can be simply modified in order to achieve joint estimation and segmentation of the movement.