几何纠正是从具有几何畸变的图形中消除变形的过程.利用摄影全站仪远程拍摄安全壳影像,通过图像处理的方法能自动化地检测裂缝.但由于拍摄角度、安全壳柱面起伏和相机畸变等因素,会产生倾斜、偏移、扭曲等图像变形,在用于后期图像拼接与分析处理前,必须先进行几何纠正.讨论针对安全壳影像的几何纠正方法,简述了安全壳表面空间方程的建立方法、摄影全站仪的标定方法和共线方程几何纠正方法的理论基础,并通过模拟实验验证了该方法的可行性.

For defective rusting on nuclear containment image,with lots of noise and interference similar in color,in this paper a rusting recognition algorithm of contour directed dilation is proposed.Using the characteristic yellowish orange color,extract basic rusting information through RGB multi-channel threshold segmentation.On the basis of rusting's annulus shape feature,the rusting by multi-direction according to contour's extension direction is divided.Contour fragment is dilated by the self-design eight-direction kernels in order to complement annulus rusting.The real rusting is recognized by roundness calculated according to contour moments.Experiments show that the algorithm can undo amounts of noise and interference similar in color so as to recognize and position the real rusting on the image.