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探测器光子响应非均匀性噪音会降低低照度情况下遥感成像系统的成像质量.针对这一现象,本文首先结合探测器的物理性质,对各种噪音源进行了研究;建立了TDI CCD不同级数下的光子响应非均匀性噪音模型,随着曝光量的增加,光子响应非均匀性噪音也线性增加.其次根据曝光级数越多TDI CCD对非均匀性噪音的平滑效应越明显这一现象,提出一种光子响应非均匀性系数与曝光级数之间的关系式,并给出了利用TDI CCD输出图像提取光子响应非均匀性噪音的方法.最后建立了试验系统,通过试验对测试获得的光子响应非均匀性噪音与理论分析计算得出的结果进行了分析.
Detector photon response to inhomogeneous noise will reduce the imaging quality of the remote sensing imaging system under low illumination conditions.According to this phenomenon, this paper first studies various noise sources based on the physical properties of the detector; Photon response to inhomogeneous noise model, the photon response inhomogeneity noise also increases linearly with the increase of exposure amount.Secondly, according to the exposure sequence, the more the smoothing effect of TDI CCD on the inhomogeneous noise is more obvious , A relationship between the photon response inhomogeneity coefficient and the exposure order is proposed and a method of extracting the photon nonuniform noise using the output image of the TDI CCD is given.Finally, a test system is established, and the test results Photon response to inhomogeneous noise and theoretical analysis of the calculated results were analyzed.