Enhanced decoding by error detection on a channel with correlated 2-dimensional errors

We apply principles from digital image correction to enhance the correction of two-dimensionally correlated unidirectional errors on a two-dimensional grid system. A restoration technique presented in Neifield et al. (1996) based on Markov random fields, is used to find an estimate of the error pattern. This estimate then in turn provides a priori information for use in a soft decoder for the actual code (e.g. LDPC decoder).