复原退化模糊图像是遥感图像处理的研究重点。对成像系统的调制传递函数(MTF)进行了研究,分析了调制传递函数的基本理论。讨论了一种近似测定成像系统调制传递函数的方法,通过有限采样,曲线拟合,傅立叶变换,规格化的一系列处理得到图像获取、传输过程中的点扩展函数(PSF)。提取完整光滑的调制传递函数曲线,在频域中对图像进行去卷积复原,分析和评价了复原结果。将该方法应用于DMC卫星图像,图像质量得到明显提高,收到较好的复原效果。

Restoration to the degraded and blurred mi age was a key point in remote sensing mi age processing. In this\npaper, modulation transfer function(MTF) of the mi aging system and the basic theory ofMTFwas researched. A new\nmethod thatproxmi atelymensurateMTFof mi aging system was presented, and a series ofprocessing technologies such as\nlmi ited sampling, curve fitting, Fourier transform and normalization and so onwere included in thismethod, so as to get\npoint spread function(PSF) in mi age acquisition and transmission. A complete and smoothmodulation transfer function’s\ncurvewas extracted, restoration ofdeconvolution to source degraded and blurred mi agewas applied in frequency domain,\nand the restoration result was analyzed and evaluated. This method was applied to DisasterMonitoring Constellation\nsatellite mi age, the quality of mi agewas greatly mi proved, and the restoration result is satisfying.