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Optimum quarter-plane autoregressive modeling of 2-D fields using four-field lattice approach

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2 Author(s)
Kayran, A.H. ; Dept. of Electr. Eng., Istanbul Tech. Univ., Turkey ; Parker, S.

A new orthogonal four-field two-dimensional (2-D) quarter-plane lattice structure with a complete set of reflection coefficients is developed by employing appropriately defined auxiliary prediction errors. This work is the generalization of the three-parameter lattice filter proposed by Parker and Kayran (1984). After the first stage, four auxiliary forward and four auxiliary backward prediction errors are generated in order to obtain a growing number of 2-D reflection coefficients at successive stages. The theory has been proven by using a geometrical formulation based on the mathematical concepts of vector space, orthogonal projection, and subspace decomposition. It is shown that all four quarter-plane filters are orthogonal and thus optimum for all stages. In addition to developing the basic theory, a set of orthogonal backward prediction error fields for successive lattice parameter model stages is presented

Published in:

Signal Processing, IEEE Transactions on  (Volume:45 ,  Issue: 9 )

Date of Publication:

Sep 1997

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