光学遥感成像系统调制传递函数补偿技术

在分析逆滤波和维纳滤波的基础上,针对CBERS卫星成像系统特性,对光学遥感成像系统调制传递函数补偿(MTFC)技术进行了研究和改进。从MTFC曲线形状角度,提出较大幅度提高中频而适当提高高频信息的MTFC补偿曲线优化设计思想,在增强图像清晰度的同时,有效抑制了噪声。文章以CBERS-02B卫星高分辨率相机(HR)成像系统为例,试验结果表明:MTFC能够显著提高图像品质,同时也会引入一定的噪声,最后对MTFC的适用性给出了建议。

Modulation Transfer Function Compensation Technology of Optical Remote Sensing Imaging System

Modulation transfer function compensation (MTFC) is very important for optical remote sensing imaging system to promote image quality and optimize the imaging system modulation transfer function (MTF). Based on inverse filtering and Wiener filtering,the MTFC technology was studied and improved according to CBERS imaging system characteristics. The optimal design of MTFC was done from MTFC curve shape as follows:the middle frequency MTF was enhanced remarkably,and the high frequency part was enhanced moderately. It not only improved the image definition,but also controlled the noise involved. Compromise has been found between the image definition and noise for this technology. CBERS-02B HR imaging system is taken as an example,the result shows that MTFC can improve the image quality obviously,and at the same time,it increases some noises. Several suggestions are given to the applicability of MTFC finally.