一种改进的中值滤波方法

An improved median filter method

探讨一种改进的中值滤波法进行VSP资料波场分离。从常规中值滤波的数学原理入手,详细探讨了一种改进的中值滤波法,使其在边界(L-1)/2个采样点的滤波效果与常规的中值滤波结果相同,而在对中间的各样点进行滤波时,将常规的中值滤波结果也参与到滤波过程中。通过对理论数据和2个零偏VSP资料进行波场分离,及对比分析分离后的波场,结果表明,改进的中值滤波相对于传统的中值滤波具有很高的稳健性和适应性。

This paper examines an improved median filter method. This method makes the filter effect of the （L-1）/2 sampling points on the boundary be same as that of the traditional median filtering, and makes the traditional filter results add in the improved median filtering. The wave field separation is done to the two zero-offset VSP cases and the result is compared with the wave field obtained by the traditional median filter. The comparison show that the improved median filter has high stiffness and adaptability relatively to the traditional one.