一种改进的局部加权拟合校正方法

几何校正是遥感图像处理的一个重要环节,是减弱遥感图像与地面真实形态差异的重要方法。但是常规几何校正方法对无人机影像进行校正,其效果不够理想。在分析了局部加权拟合校正法的基础上,用控制圆规定其局部校正区域,并且新增辅助控制点来覆盖该区域,以这种方法对其进行了改进。通过对同一无人机影像进行几何校正对比分析实验,结果表明:改进的局部加权拟合校正法能够更充分、合理地利用局部控制点信息,对控制点的分布具有更好的适应性,能够有效提高无人机影像的几何校正精度。

An Improved Locally-weighted-fitting Technique

In remote sensing image process,geometric correction is an important component that can reduce or eliminate differences between remote sensing image and real geographic shape.But the effect of conventional technique for UAV image geometric correction is not satisfactory,it improves the locally-weighted-fitting technique by using control circle to regulate its local corrected region and adding auxiliary control point to the cover area.By contrast geometric correction analysis experiment,it shows that the locally-weighted-fitting technique improved may be more adequate and reasonable use of local information,has stronger adaptability for the distribution of control points,and can effectively improve the accuracy of the image geometric correction.