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对地观测图像BRDF校准模型的建立与应用

Keywords: 双向反射分布函数,校准建模,对地观测图像,色差

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Abstract:

为提高对地观测图像质量的数据校准方法,建立区别于传统模型的对地观测目标复合双向反射分布函数(BRDF)模型.通过BRDF量值实现计量标准对该模型进行绝对量值标定,使得对地观测影像更真实反映观察对象.该模型综合考虑对地观测目标的BRDF分布、太阳辐射、大气分布状况等,加入BRDF国家计量标准的修正参量,结合遥感相机参数,得到计量校准后的遥感相机入瞳辐亮度数据.以一种典型建筑材料毛玻璃的BRDF测量及其对地观测图像的校准为例,通过这一复合模型的校准,其图像的色差提高约3,亮度对比提高约3.

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