利用海岸线的海洋遥感图像控制点(GCP)自动匹配法
Automatic location of GCPs at sea
-
摘要: 研究一种利用海岸线自动确定海上地面控制点(GCP)的方法.借助边缘检测技术提取海岸线,将海岸线的点全部作为控制点的备选集合,利用相关松弛法寻找同名点,建立一种可靠判别机制来保证海岸线上GCP的正确性,通过平均法和插值法求取海上GCP的值.利用本方法可以方便地得到分布密集的GCP值,其中海上GCP值具有子像元精度.同时研究了一种新的几何变换方法,即用插值法直接求取需校正图像的几何变换坐标,随着插值密度的增加,求得海上GCP值的点就越多,最后使所有点的坐标值通过插值方法计算得到,代替二元n次方程组进行空间坐标变换,使遥感图像的几何配准误差在某种程度上达到0,利用该方法对海洋遥感资料进行几何配准,可以提高配准的精度和节省机时,为遥感资料的动态监测和数据库建设创造了有利条件.Abstract: A new method is developed to locate ground control points (GCPs) at sea.All points at the coastline,extracted by Roberts' edge operator from the first image,are taken as candidate points of GCPs.The counterpart points in the second image are found by correlation-relaxation (CR) technique.The accuracy of GCPs is guaranteed by a decision rule.The methods of average and interpolation are used to locate new GCPs at sea.A new transformation of geometric rectification is also developed with zero RMS error.The coordinates of the rectified image can be directly obtained from interpolation method instead of a 1st-order bivariate transformation.The above-mentioned approach can be used in dynamic monitoring and integrating of satellite data.
-
Key words:
- GCP /
- image registration /
- correlation-relaxation /
- decision rule
-
Patt F S,Woodnard R H,Gregg W W.An automated method for navigation assessment for earth survey sensors using island targets.,Int J Remote Sensing,1997,18(16):3311~3336 Goshtasby A,Stockman G C,Page C V.A region-based approach to digital image registration with subpixel accuracy.IEEE Trans Geosci Remote Sensing,1986,GE-24(3):390~399 Ventura A D,Rampini A,Schettini R.Image registration by recognition of corresponding structures.IEEE Trans Geosci Remote Sensing,1990,28(3):305~314 Motrena P,Rebordao Y M.Invariant models for ground control points in high resolution images.International Journal of Remote Sensing,1998,19:1359~1375 Cracknell A P,Paithoonwattanakij K.Pixel and sub-pixel accuracy in geometerical correction of AVHRR imagery.Int J Remote Sensing,1989,10(4):661~667 Ton F,Jain A K.Registering Landsat images by point matching.IEEE Trans Geosci Remote Sensing,1989,27(5):642~651 毛志华,潘德炉,潘玉球,等.常规信息对遥感海表流场的修正方法.海洋学报,1997,19(3):130~137 Peli T.A study of edge detection algorithms.Computer Vision and Image Processing,1982,(20):1~21 Sethi I K.Edge detection using charge analogy.Computer Vision and Image Processing,1982,(20):185~195 Poppl S,Henmann G.Boundary detection in scintigraphic images.Computer Vision and Image Processing,1982,(19):281~290 Suk M,Hong S.An edge extraction technique for noisy image.Computer Vision and Image Processing,1982,(25):24~25 Hartle R A.Gaussian-weighted multi-resolution edge detector.Computer Vision and Image Processing,1985,(30):70~83 朱长春,杨晓梅,陶大欣.基于样条二进小波的影像多尺度边缘检测.遥感学报,1997,1(4):262~266
点击查看大图
计量
- 文章访问数: 934
- HTML全文浏览量: 14
- PDF下载量: 1095
- 被引次数: 0