空间相机自适应曝光

曹旗磊; 董丽丽; 赵明; 许文海; 李瑛

doi:doi:10.3788/gzxb20164508.0822003

光子学报, 2016, 45 (8): 0822003, 网络出版: 2016-09-12

空间相机自适应曝光

Adaptive Exposure of Space Camera

论文大纲

曹旗磊 ^*董丽丽赵明许文海李瑛

作者单位

大连海事大学信息科学技术学院, 辽宁大连 116026

空间相机测光相机动态范围匹配曝光调整 Space camera Metering system Dynamic range match Exposure adjustment

摘要

为实现空间相机的自适应曝光, 提出了一种根据场景高亮度信息设置曝光参量的测光、解算、成像工作模式.在空间相机前加装大尺度面阵测光相机, 在空间相机推扫某一区域前, 测光相机首先采用预设的曝光参量获取该区域图像, 实测当前区域的高亮度信息；再将该高亮度设为空间相机的饱和亮度, 解算空间相机的曝光参量；随着卫星的转动, 空间相机采用该曝光参量完成位置区域拍摄成像, 实现空间相机的自适应曝光.地面验证实验结果表明：与采用固定的较小的曝光参量相比, 本文方法可以减小欠曝光图像数量；根据某次实验结果统计, 图像的灰度范围由37提高到253, 图像熵显著提高.该方法能够根据当前场景内容充分利用成像系统的动态范围并提高图像的灰度层次和图像质量.

Abstract

In order to realize the adaptive exposure of the space camera, this paper proposes a method for adaptively configuring exposure parameters according to the highest luminance information of scene, which is realized by metering, calculating and imaging, successively. A large-scale array camera for light metering is installed besides the space camera. First, before the space camera is push-broom imaging a certain area, the image of this area can be obtained by metering camera with preset exposure parameters in advance, and the highest luminance information of this area can be measured. Then, exposure parameters of the space camera can be calculated by setting the highest luminance information measured before as the saturation luminance of the space camera. Finally, when the space camera focuses on this area after orbiting to a certain extent, the space camera could realize adaptive exposure by adopting exposure parameters calculated previously. Ground experiment results show that, compared with the method of using fixed small exposure parameters, the proposed method can reduce the number of under-exposed images. According to statistical results, the gray range of images is enlarged from 37 up to 253, and the image entropy also increases significantly. This method can adequately make use of the dynamic range of imaging system according to the current scene, improving the gray range and quality of the image.

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曹旗磊, 董丽丽, 赵明, 许文海, 李瑛. 空间相机自适应曝光[J]. 光子学报, 2016, 45(8): 0822003. CAO Qi-lei, DONG Li-li, ZHAO Ming, XU Wen-hai, LI Ying. Adaptive Exposure of Space Camera[J]. ACTA PHOTONICA SINICA, 2016, 45(8): 0822003.

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