FY-3B微波成像仪图像质量评价

2010年11月5日发射升空的我国新一代极轨气象卫星FY-3B (“风云三号”B星)携带的微波成像仪,可以全天候获取来自地球表面和大气的电磁辐射信息。针对在轨测试期间微波成像仪1.7 s和1.8 s两种扫描周期,详细比较了二者图像质量的差异。在图像质量评价研究中,使用统计方法比较了图像的动态范围;通过功率谱计算,对比了图像的空间纹理特征;通过信息熵计算,分析了图像信息量的不同;此外,还研究了图像的对比度以及通道间配准的情况。结果表明:1.7 s图像的空间纹理结构、高频图像的对比度以及通道间配准明显优于1.8 s,表明1.7 s扫描周期下的图像质量优于1.8 s,该结论可以作为微波成像仪仪器指标设计的参考。

Image Quality Evaluation of MWRI from FY-3B Satellite

In November 5th 2010,new generation meteorological FY-3B satellite successfully was launched,Microwave Radiation Imager (MWRI) can all day get radiation information from earth surface and atmosphere.Two scan periods were set during orbit test,1.7 s and 1.8 s separately.In this paper,image quality differences were analyzed in detail.On the study of image quality evaluation,statistical method was used to compare the dynamic range of image.By using power spectrum,space texture of image can be contrasted.Whats more,information entropy was used as a tool to evaluate the information magnitude.Finally,the image contrast and match situation among different channels were studied.The results show that 1.7 s is obviously better than 1.8 s in space texture,channel match and contrast,which means the image quality of 1.7 s is better than 1.8 s.The conclusion can be an important reference of MWRI instrument parameter design.