中文摘要：

边缘检测的效果受到地质体埋深的影响,随着深度的增加,边缘检测的范围会有所扩大。本文首先根据迭代法与FFT法向下延拓的曲线形态推断场源上顶埋深,然后用迭代法将位场值向下延拓至接近场源的深度以使磁异常图像的特征点与场源边界有较好的对应关系。在此基础上,利用Canny算子对特征点进行追踪,进而推断场源的水平边界。通过模型试验和实际资料处理,验证了该方法的正确性。

英文摘要：

The result of edge detection is affected by the buried depth of geological body.With the increase of buried depth,the scope of the edge detection will have been somewhat expanded.The depth of the field source can be inferred by the downward continuation curves based on iterative method and FFT method.By using iterative method we can continue the potential field data downward close to the depth of field source,in order to make field source boundary and feature points have good corresponding relation.On this basis,we use Canny Operator to track feature points,and conclude the level boundary of the field source.Feasibility is proved through model test and field data processing.