Contourlet变换在局部角度属性提取中的应用

Application of contourlet transform to extraction of local angle attribute

为了直观展示地质的构造走向、暗示细小裂缝信息,便于地震资料解释,应用Contourlet变换和无抽样Contourlet变换提取地震剖面的局部角度属性,提出了基于Contourlet变换的局部角度属性提取方法 .首先用Contourlet变换或无抽样Contourlet变换将地震剖面分解成为不同尺度下的方向子带,然后将不同方向的子带分别进行重构,从所有重构剖面中查找每一空间位置点对应的幅度最大值,最后根据幅度最大值所对应的方向号确定每一个位置点的方向,从而得到原始地震剖面的局部角度属性.实验结果表明,Contourlet变换可以灵活快速地提取地震剖面的局部角度,而使用无抽样Contourlet变换,可以获得更为准确的局部角度属性.

In order to visually display the trend of geological structure and effectively hint the tiny faults, contourlet transform and nonsubsampled contourlet transform are used to extract local angle attributes of seismic sections. First, the seismic section is decomposed by the contourlet transform or nonsubsampled contourlet transform to generate directional subbands on different scales. Then, we respectively reconstruct the subbands in different directions and search the maximum amplitude at each space location from all the reconstructed sections. At last, the orientation of each space location is determined according to the maximum amplituder s corresponding direction number. Experimental results show that the contourlet transform can extract the local angle of seismic section flexibly and efficiently while the nonsubsampled contourlet transform can extract the local angle more precisely.