不同时相遥感图像的镶嵌技术

本文介绍针对不同时相遥感图像镶嵌中的技术难题开发的一整套数字镶嵌方法。采用递推式灰度调整、滑动窗口探测最佳拼接点及对其两侧作加权灰度圆滑方法, 以消除被镶嵌图像之间因色调差异造成的接缝；采用在相邻图像重叠区内选取控制点并按控制点追踪进行镶嵌方法, 以提高镶嵌的几何精度；还采取了单元镶嵌法, 以解决遥感图像数据量庞大而计算机容量有限的矛盾。用上述技术和作者开发的相应软件, 成功地制作了长江中下游等多个地区的TM影像镶嵌图, 受到应用人员好评。

TECHNIQUES OF MOSAICKING MULTI-SCENES OF REMOTE SENSING IMAGES ACQUIRED IN DIFFERENT TEMPORAL

Abstract In this paper, a complete set of digital mosaicking methods developed for the technical problems in mosaicking multi-scenes of remote sensing images acquired in different temporal is presented. In order to eliminate the mosaicking seam caused by tone difference between the adjacent images to be mosaicked,the techniques including gray-level adjustment through histogram matching progressively, detection of the optimum mosaicking point using a sliding window,and gray-level smoothing with the help of weighting on both sides of the mosaicking point are adopted. To improve the geometric accuracy of mosaicking,control points are selected in the overlapping area of the two images so that the mosaicking can be carried out by tracing the control points. And the unitmosaicking approach is used so as to realize the mosaicking of huge volume of data on a small computer system. Based on the techniques mentioned above and corresponding software developed by the authors,the mosaic images of many regions, say, the Middle and Lower Reaches of Yangtse River, are produced successfully, and the images have won high praises from the users.