Short Note 3-D steering filters

Each of these problems used a 2-D steering filter. Fomel (1999) introduced a method to construct a 3-D steering filter. Fomel formed a 3-D steering filter operator by first convolving two 2-D operators. To obtain a minimum-phase filter he performed spectral factorization for each dip component (px , py) pair in the data, significantly increasing the cost of constructing the operator. In order for the resulting filter to spread information over significant distances, a large number of filter coefficients must be used, increasing the cost of each iteration.