不同形态学剖面线遥感影像分类精度比较

摘要

Different morphological methods and structuring elements have great influence on classification accuracy of remote sensing images.There is no further research about this in domestic and abroad.Here we choose two research areas from Wuhan,using four kinds of morphological methods which are opening operator,closing operator,opening-closing operator and closing-opening operator and four structuring elements which are diamond,disk,octagon,and square to construct 32 morphological profiles.The QuickBird image classification experiment was carried out in two study areas.The effect of different morphological profiles on classification results based on overall accuracy and Kappa coefficient was compared.The results show that,the opening-closing operator and closing-opening operator have great advantages over ordinary method and other two morphological methods on classification accuracy and they can clearly extract small plaque features;when the structuring element is octagon,the features of small patches are easily to be left out and the original points will be easily replaced by others;when the morphological methods are closing operator and opening operator,the classification accuracy of octagon is the highest;when the morphological methods are closing-opening operator and opening-closing operator,the classification accuracy of all the structuring elements is good except for square element,and the accuracy of diamond element is the highest among these four elements.%针对不同形态学方法和结构元对于形态学剖面线遥感影像分类精度的影响存在较大差异，而国内外在这方面缺乏深入研究的不足，该文选取了武汉市两个实验区，构造了32个形态学剖面线，对研究区的 QuickBird影像进行了分类。通过总体精度、Kappa 系数和剖面线分类结果图，比较了不同形态学剖面线对于分类结果的影响。结果表明：在结构元形状相同的情况下，先开运算后闭运算和先闭运算后开运算在分类精度方面明显优于一般方法和其他两种形态学方法，能够比较清晰地提取出小斑块地物特征；当形态学方法为闭运算和开运算的时候，八边形结构元对应的结果精度最高；当形态学方法为先开运算后闭运算和先闭运算后开运算时，除了方形结构元，其他结构元得到结果精度都较高。