TDICCD相机平台振动所致的MTF空间移变降质

发布时间：2018-03-06 12:36

本文选题：卫星振动　切入点：TDICCD相机　出处：《光学精密工程》2016年06期 　论文类型：期刊论文

【摘要】：卫星振动不仅会引起TDI(Time Delay and Integration)CCD相机像元采样的不规则性,还会引起像元弥散斑空间分布的不一致性,导致图像传递函数(Modulation Transfer Function,MTF)产生空间变化,从而制约高分辨率图像振动复原质量。本文从卫星振动对TDICCD相机推扫成像采样过程的作用机理出发,结合理论推导与仿真研究,得到了平台振动引起的图像空间移变降质及表征方法。然后在振动复原模型的基础上,推导得出MTF空间移变降质对复原处理误差的影响,并基于实际卫星图像开展了复原实验。实验结果表明:当振动所致图像MTF空间移变降质小于15%时,复原处理后的图像与理想图像的结构相似度优于0.95,而且处理误差所导致的图像失真不影响判读质量。
[Abstract]:Satellite vibration will not only cause irregular sampling of pixel in TDI(Time Delay and Integration)CCD camera, but also cause inconsistency of spatial distribution of pixel dispersion spots, resulting in spatial variation of image transfer function modulation Transfer function. In order to restrict the quality of high-resolution image vibration restoration, this paper starts from the mechanism of satellite vibration sampling process of push-scan imaging of TDICCD camera, combining with theoretical derivation and simulation research. Based on the vibration restoration model, the effect of MTF space shift and reduction on the error of restoration processing is derived. The experiment is carried out based on the actual satellite image. The experimental results show that when the spatial shift and mass reduction of the image caused by vibration is less than 15, The structural similarity between the reconstructed image and the ideal image is better than that of the ideal image, and the distortion caused by the processing error does not affect the interpretation quality.
【作者单位】：哈尔滨工业大学空间光学工程研究中心;
【基金】：国家973重点基础研究发展计划资助项目(No.613210)
【分类号】：V445.8

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