基于Curvelet域的位场多源数据融合方法

如何将大面积低精度数据与局部高精度数据进行融合,统一编制图件,是地球物理综合研究面临的重要问题。位场数据融合主要对低、高精度数据重叠区进行融合,为了提高融合效果,保持重叠区高精度信息,本文提出了基于Curvelet域的结合区域梯度的边界衰减方向加权融合算法。该法利用尺度和梯度调节衰减函数对不同方向的Curvelet系数进行加权处理。理论分析及中国南方中扬子地区的区域航磁数据融合实例表明,本文算法可以在保持局部信息的前提下,能够以较小的重叠区域,实现不同精度数据间的融合,重叠区数据精度高,同时避免了高频震荡、异常扭曲等边界效应。

Potential field data fusion in curvelet domain

To fuse the low-precision data of large area with the local high-precision data for unified compilation is an important issue for integrated geophysical research.The key of this job is the fusion for overlap area of low-precision,high-precision data.In order to enhance the effectiveness of fusion data and preserve information of high-precision data,we propose here a new fusion algorithm,called boundary attenuation and direction weighted with regional gradient in curvelet domain.We use the scale and gradient to impact the weighted operator and then apply it on the curvelet coefficients as weighted calculation.Both theoretical analysis and applications on aeromagnetic data fusion in South China indicate that the algorithm can maintain the local information and get a good fusion result with a small overlap area.Data Accuracy at overlap area is high and especially it avoids the boundary effect,such as high-frequency vibration,abnormal distortions,etc.