TM影像地面二向性的分析及校正方法研究

在影响辐射失真的各种因素中,二向反射特性越来越被人们所重视。本文针对地面二向反射特性造成的辐射失真问题进行深入的研究,从辐射失真的根本角度上补偿色调的差异,使得尽量恢复图像灰度与实际地表辐射的真实对应关系。并采用适合TM影像的Roujean模型进行实验处理,得到了较好的减弱辐射差异的效果。最后采用影像拼接等方法对实验结果进行了分析和评价。

Research on the analysis and calibration of ground bi-directional reflectance character based on TM images

Bi-directional reflectance characteristic is among the most important factors of radiance distortion. This paper discusses the radiance distortion caused by the ground bi-directional reflectance character and compensates the difference of tone from the point of radiance distortion, which resumes the really corresponding relation between gray level of the image and actual ground radiance. The experiment of Roujean model that fit TM images in this paper shows that the approach is effective for TM images radiance distortion. Finally, the paper adopts the analytic method of images mosaic and draws the conclusion.