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FY-2卫星热红外波段MTF在轨评价及其在改进图像质量中的应用

Keywords: 调制传递函数,在轨评价,斜坡模型,热红外,图像复原

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Abstract:

提出了基于理想斜坡模型及目标延拓空间卷积变换的采样成像系统热红外波段MTF在轨评价方法.仿真结果表明,该方法对性能良好的成像系统而言,系统特征MTF值的绝对评价误差约0.05.同时,利用2006~2008年间的观测数据,定量评价了FY-2C卫星热红外通道的系统MTF特性,与卫星发射前地面测试结果基本一致.采用在轨评价得到的系统点源扩展函数(PSF),对FY-2C卫星热红外通道图像进行了复原处理,得到了清晰度更高的图像产品,并给出了对典型台风监测结果的改进.传统在轨MTF评价方法中采用的理想阶跃模型,可视为理想斜坡模型中参数Nslope为0时的特例.因此,该方法同样适用于可见光、近红外波段的在轨MTF评价.

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