非线性滤波技术在地震信号处理中的应用

Application of Nonlinear Diffusion in Seismic Image Sequences

地震序列是具有线形纹理特征的图像.早期的去噪方法多是线性的,会产生一些副作用.目前一些处理软件使用中值滤波方法,但当同相轴有倾角时就不适应了.本文根据线形纹理图像的特征,采用一致增强性扩散算法,它以扩散张量作为扩散系数,是一种各向异性扩散,能较好的保护边缘纹理信息,并针对同相轴的弱边界问题提出二阶导数处理法,它能使断裂的同相轴变得连续,更有利于解释.经计算,一致增强扩散比中值滤波信噪比有所提高,同时,同相轴更为连续,纹理更加清晰.

The seismic image sequences have line- like texture features. Some cases of linear diffusion have some side effects. At present, some kinds of software use mid- value filtering, but when events have obliquity, midvalue is not suitable. The coherent enhancing diffusion is used in this paper according to the line- like texture, which is an anisotropic diffusion. It can protect and enhance the edges and texture. It can make the event concatenate and also have the very great significance for exploring the geological reserves. And, the SNR is clearer than before.