测绘学报

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遥感相机在轨点扩散函数高精度测量方法

郭玲玲1,吴泽鹏1,张立国1,张星祥1,任建岳2   

  1. 1. 中国科学院长春光学精密机械与物理研究所
    2. 中科院长春光机所
  • 收稿日期:2012-12-24 修回日期:2014-01-14 出版日期:2014-03-20 发布日期:2014-01-15
  • 通讯作者: 郭玲玲
  • 基金资助:

    国家863计划;国家国防973计划

A precise method to measure the on-orbit point spread function of remote sensors

  • Received:2012-12-24 Revised:2014-01-14 Online:2014-03-20 Published:2014-01-15

摘要:

提出了一种新的遥感相机在轨点扩散函数测量方法,在阶跃响应法基础上,深入分析了倾斜角度、尺寸、插值、对比度、像素饱和、噪声等因素的影响,通过选取满足条件的阶跃区域并进行采样相位弱化处理,增加了测量结果的准确度。通过对实际全色谱段遥感图像的实验,验证了方法的有效性与可靠性,并利用所测点扩散函数对退化图像进行了复原,复原图像质量明显提高。

关键词: 光学遥感, 点扩散函数, 阶跃响应法, 图像复原

Abstract:

A new approach to measure the on-orbit point spread function of remote cameras is proposed here. Based on the classical step-edge method, we made a profound analysis about the influence of the tilted angle, size, interpolation, contrast, pixel saturation and noise of the step-edge image. The conditional step-edge image is first detected and then processed to weaken the impact of sampling phase in order to improve the precision of the measurement. The experiment on real remote sensing panchromatic data demonstrates the effectivity and credibility of the new method. Furthermore, the degraded image is restored using the measured point spread function; the quality of the image is significantly improved.

Key words: optical remote sensing, point spread function, step-edge method, image restoration

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