不同窗口下中值滤波与加权滤波方法效果分析

Performance of median filtering and weighted average filtering under different window sizes

为了探究中值滤波与加权滤波方法对测深数据粗差的处理效果,该文以单波束测深数据为例,对中值滤波和加权滤波在不同大小滤波窗口的测深数据处理效果进行对比分析。实验结果表明,中值滤波不论在地形起伏变化较快的区域,还是在少量、断点不连续的区域以及大量、断点连续的区域,均具有较好的滤波效果,且在5窗口时效果最佳;而加权滤波在地形起伏变化较快的区域以及少量、断点不连续的区域处理效果明显,且在3窗口时效果最佳,但中值滤波效果更优,而在大量、断点连续的区域加权滤波效果明显较差,建议优先考虑中值滤波方法。

In order to explore the processing effect of median filtering and weighted average filtering on gross errors of sounding data, single beam echo sounding data was taken as an example to compare and analyze the performance of different methods under different window sizes. The result demonstrated that median filtering showed effectively in areas with rapid terrain fluctuations, areas with a small number of discrete breakpoints, or areas with a large number of continuous breakpoints, and the best filtering effect was achieved in windows 5. The weighted filtering had obvious effect in areas with rapid terrain fluctuations and areas with a small number of areas with discontinuous breakpoints, and the best filtering effect was achieved in windows 3,but the median filtering effect was better. However, the weighted filtering effect was significantly worse in the areas with a large number of continuous breakpoints. Therefore, it was recommended to give priority to the median filtering.