DMC卫星图像MTF分析及其复原方法研究

DMC Satellite Image MTF Analysis and Restoration Method Research

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 image was a key point in remote sensing image processing. In this paper, modulation transfer function(MTF) of the imaging system and the basic theory of MTF was researched. A new method that proximately mensurate MTF of imaging system was presented, and a series of processing technologies such as limited sampling, curve fitting, Fourier transform and normalization and so on were included in this method, so as to get point spread function(PSF) in image acquisition and transmission. A complete and smooth modulation transfer function’s curve was extracted, restoration of deconvolution to source degraded and blurred image was applied in frequency domain, and the restoration result was analyzed and evaluated. This method was applied to Disaster Monitoring Constellation satellite image, the quality of image was greatly improved, and the restoration result is satisfying.