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通过分析Chang’E-1卫星所获取的高光谱数据的太阳高度角因素,选取了太阳高度角较高的IIM2C数据进行光谱定标。采用邻域平均法及邻域加权均值法对原始数据进行了杂点、条带修复。由于干涉成像光谱仪CCD阵列增益畸变以及它的自身问题使得干涉影像存在横向响应不均一性,提出采用基于子空间最大特征值法进行校正,结果影像亮度统计其强度表现均一,符合自然图像特征,并采用自编程序进行几何校正。运用国际上较为成熟的经验线性法对Chang’E-1IIM 2C数据进行绝对定标;与此同时,为了修正线性定标的偏置系数及降低数据噪声,首次采用自适应小波变换法对辐射定标后数据进行后处理,确定了IIM2C数据可用波段。通过对比国际标准定标点数据,制订了嫦娥IIM2C数据分析方案,完成了第一幅完整的Chang’E-1IIM 2C月球正面反射率影像。
By analyzing the solar elevation angle of hyperspectral data acquired by Chang’E-1 satellite, IIM2C data with high solar elevation angle was selected for spectral calibration. Adopting the neighborhood averaging method and the neighborhood weighted mean method, the original data were analyzed for noise and banding. Due to the gain distortion of CCD imaging array and its own problems, the interferometric image has lateral response heterogeneity. The correction based on the maximum eigenvalue method in subspace is proposed. As a result, the image brightness statistics are uniform in intensity and consistent with the natural image features. Using self-programming for geometric correction. In the meantime, in order to correct the offset coefficient of linear calibration and reduce the data noise, the adaptive wavelet transform method is applied to the radiometric calibration Post-standard data post-processing, to determine the IIM2C data available band. By comparing the international standard calibration point data, Chang’e IIM2C data analysis program was formulated and the first full Chang’E-1IMIM lunar frontal reflectivity image was completed.