成像系统与场景动态范围匹配的方法研究

发布时间：2018-06-07 17:55

本文选题：航天遥感测光 + 场景动态范围测量　；参考：《大连海事大学》2014年硕士论文

【摘要】：航天遥感技术已广泛应用于人们的生活、生产及科研中,随着现代科学技术的高速发展,航天遥感器的分辨率越来越高,其地面观测尺度也越来越小。TDI CCD所独具的时间延迟积分扫描方式能够增大线阵CCD传感器的扫描灵敏度,并且其能够提高成像信噪比的特点,使其已经广泛应用于航天遥感中。但是其测光难一直是一个问题。本文从场景动态范围的角度出发,为航天遥感的测光提出一种方法。本文主要由场景动态范围匹配、基于动态范围测量的高动态图像拍摄和动态范围匹配的试验验证三个部分组成。首先,本文阐述了成像系统动态范围及场景动态范围的原理,并从单一像素的光生电荷理论出发,定义相对辐照度,为场景动态范围的匹配提供理论基础,并分析了场景动态范围的匹配原则。其次,本文采用多次拍摄获得场景的动态范围,引入像移补偿的方案,解决了载体运动对拍摄的影响,并根据场景的动态范围,提出高动态图像拍摄方案,并利用高动态图像与匹配图像进行比较,判断匹配图像是否有效。最后,搭建动态范围匹配的试验平台,以验证场景动态范围的匹配及高动态图像拍摄方案的有效性。实验结果表明,场景动态范围测量和场景动态范围匹配方案可行有效。
[Abstract]:Space remote sensing technology has been widely used in people's life, production and scientific research. With the rapid development of modern science and technology, the resolution of space remote sensor becomes higher and higher. The time-delay integral scanning method of TDI CCD can increase the scanning sensitivity of linear CCD sensor, and it can improve the characteristics of imaging signal to noise ratio (SNR), which makes it widely used in space remote sensing. But the difficulty in measuring light has always been a problem. From the point of view of dynamic range of scene, this paper proposes a method for photometry of space remote sensing. There are three parts: high dynamic image shooting based on dynamic range measurement and experimental verification of dynamic range matching. Firstly, the principle of dynamic range and scene dynamic range of imaging system is described in this paper. Based on the photogenerated charge theory of a single pixel, the relative irradiance is defined to provide a theoretical basis for scene dynamic range matching, and the matching principle of scene dynamic range is analyzed. In this paper, the dynamic range of scene is obtained by multiple shots, and the scheme of image shift compensation is introduced to solve the influence of carrier motion on shooting. According to the dynamic range of scene, a high dynamic image shooting scheme is proposed. The high dynamic image is compared with the matching image to judge whether the matching image is effective. Finally, the experimental platform of dynamic range matching is built to verify the validity of scene dynamic range matching and high dynamic image shooting scheme. The experimental results show that the scheme of scene dynamic range measurement and scene dynamic range matching is feasible and effective.
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TP751;V443.5

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