不同季相SPOT5影像镶嵌前色调处理方法研究

Color Processing Methods of Different Seasonal SPOT5 Images before Mosaic

只有少数影像可供选择时,如何镶嵌季相差异大的影像,以取得较好的镶嵌效果,是一个很常见的技术问题。该问题的难点主要在于如何减小镶嵌影像间色调的差异。以厦门市两景不同年份、不同季相、色调差异很大的SPOT5卫星影像为例,采用数值调整,栅格编辑填充和特征信息提取、分类等图像处理方法,对影像上色调差异很大的斑块状地物和不规则零碎地物进行处理,达到了减小两景影像中同一地物特征色调差异的目的。文中提出的均色方法可以改善影像镶嵌效果,具有较强的实用性。

With only few images for choice,how to mosaic images of different seasonal and produce good mosaic image is a very common technological problem.The main difficulty for this problem is how to minish the color difference between mosaicing images.In this paper,taking two SPOT5 satellite images of Xiamen city,with different seasonal,acquired in different year and with large color difference,as a case,we used several image processing methods,including rescale,raster fill,extraction of feature information and classification etc.to decrease the color difference of two kind ground features：patch one and irregular pieces one.The methods proposed in this paper make possible produce good mosaic images and they are very practical.