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为提高遥感图像质量,对航天遥感相机系统进行了优化,并提出一种航天遥感相机参数优化方法。在航天遥感相机中设计动态钳位电压值并在航天遥感相机前加装大尺度面阵测光相机,在航天遥感相机推扫某一区域前,测光相机通过低曝光参数和高曝光参数获取该区域图像,实测当前区域的高辐射亮度和低辐射亮度。将高辐射亮度与低辐射亮度的差值设为航天遥感相机的饱和亮度,解算航天遥感相机的曝光参数,并将实测低辐射亮度值设置为钳位电压值。随着卫星的转动,航天遥感相机采用上述曝光参数和钳位电压值完成该位置区域的成像,实现航天遥感相机参数自动调整。地面验证实验表明,通过优化航天遥感相机系统,可在成像前去除大气对灰度层次的影响,提高图像辐射分辨率。根据实验结果统计,图像的灰阶范围可提高80.7%,图像熵显著提升。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,提高图像的灰度层次和图像质量。
In order to improve the quality of remote sensing images, the spaceflight remote sensing camera system is optimized, and a parameter optimization method of spaceflight remote sensing camera is proposed. In the space remote sensing camera, the dynamic clamp voltage is designed and a large-scale area array metering camera is installed in front of the space remote sensing camera. Before the remote sensing camera flies to scan a certain area, the metering camera is obtained through the low exposure parameter and the high exposure parameter The area image, measured the current area of high radiation brightness and low radiation brightness. The difference between high radiation brightness and low radiation brightness is set as the saturation brightness of the space remote sensing camera, the exposure parameter of the space remote sensing camera is calculated, and the measured low radiation brightness value is set as the clamp voltage value. With the rotation of the satellite, the space remote sensing camera uses the above exposure parameters and clamp voltage values to complete the imaging of the location area, so as to automatically adjust the parameters of the space remote sensing camera. The ground validation experiments show that by optimizing the space remote sensing camera system, the influence of the atmosphere on the gray level can be removed before imaging to improve the resolution of the image radiation. According to the experimental results, the grayscale range of the image can be increased by 80.7%, and the image entropy is significantly improved. The method can make full use of the dynamic range of the imaging system according to the current scene content to improve the gray level and the image quality of the image.