空间相机自适应曝光

发布时间：2018-02-28 17:28

本文关键词： 空间相机测光相机动态范围匹配曝光调整　出处：《光子学报》2016年08期 　论文类型：期刊论文

【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 space camera, a light measuring, calculating and imaging mode of setting exposure parameters according to the high luminance information of the scene is proposed. A large scale area array photometric camera is installed in front of the space camera. Before the space camera is pushed to sweep a certain area, the photometric camera first uses the preset exposure parameters to obtain the image of the region, and then measures the high brightness information of the current region, and then sets the high brightness to the saturation brightness of the space camera. The exposure parameters of the space camera are calculated. With the rotation of the satellite, the space camera uses the exposure parameter to complete the position region imaging. The experimental results of ground verification show that the proposed method can reduce the number of underexposed images compared with the fixed smaller exposure parameters, and the experimental results show that the proposed method can reduce the number of underexposed images. The gray range of the image is raised from 37 to 253, and the image entropy is greatly improved. This method can make full use of the dynamic range of the imaging system according to the current scene content and improve the gray level and image quality of the image.
【作者单位】：大连海事大学信息科学技术学院;
【分类号】：V445.8

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