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《Oil Geophysical Prospecting》 1989-03
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Automatically-adjusted median filtering and its application

Wang Chengli  
Automatically-adjusted median filtering is different from tradi- tional median filtering for horizontal direction.It first makes directional scanning of each sample of a trace under certain criterion,then per- forms median filtering in a fixed direction,with weighted median filter- ing applied to boundary traces.Two kinds of weighting factors are re- commended here.The median used in long span median filtering is cal- culated using an approximate optimum fast median algorithm.Presented here are the application examples in(1)suppressing random noises to raise S/N ratio,(2)separating VSP wave fields and(3)removing some high energy coherent noises with different apparent velocities by mak- ing use of partial automatically-adjusted median filtering.The results show that this method has brilliant application prospect.
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