采用帧转移CCD的Smear校正通道恢复饱和图像通道的方法研究

发布时间：2018-02-11 04:55

本文关键词： 帧转移面阵CCD Smear校正通道杂散光饱和信号恢复　出处：《红外技术》2016年01期 　论文类型：期刊论文

【摘要】：海洋水色遥感应用对光学遥感仪器提出了高灵敏度与高精度的要求。本文研究的可见近红外成像光谱仪采用推扫扫描的方式,从而获得了较高的灵敏度;通过对系统进行杂散光定标和校正实现高精度测量。杂散光校正算法要求图像中所有目标信号不能饱和。由于仪器的动态范围针对水色目标设置,因而大部分图像通道高亮度的云目标信号会饱和,导致杂散光校正算法无法获得较好效果。以一台基于帧转移面阵CCD的推扫式可见近红外成像光谱仪为研究对象,通过分析系统设置的CCD Smear校正通道的成像机理,论证了在不同光源下Smear通道和各图像通道间均存在线性相关性,进而提出了一种利用Smear校正通道来恢复各图像通道饱和信号的方法,为星上高光谱图像的杂散光校正提供有效的数据源,也为饱和图像恢复提供了一种较为可行的方法。
[Abstract]:The application of ocean water color remote sensing requires high sensitivity and high precision of optical remote sensing instrument. The method of push-scan is used in the visible and near infrared imaging spectrometer studied in this paper, so the high sensitivity is obtained. The system is calibrated with stray light and calibrated to achieve high accuracy measurement. The stray light correction algorithm requires that all target signals in the image cannot be saturated. Because the dynamic range of the instrument is set for the water color target, As a result, the cloud target signals with high brightness in most image channels will be saturated, and the stray light correction algorithm will not be able to achieve good results. A push-over near infrared imaging spectrometer based on frame transfer area array CCD is used as the research object. By analyzing the imaging mechanism of the CCD Smear correction channel set by the system, it is proved that there is a linear correlation between the Smear channel and the image channel under different light sources. Furthermore, a method using Smear correction channel to recover the saturated signal of each image channel is proposed, which provides an effective data source for the stray light correction of the hyperspectral image on a satellite, and a more feasible method for the recovery of the saturated image.
【作者单位】：中国科学院上海技术物理研究所;中国科学院大学;
【基金】：空间科学基金项目(20130190001)
【分类号】：TP751

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