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提出了航天遥感相机的动态钳位方法,该方法通过在相机的模拟前端对大气程辐射值进行减除,实现场景信息的充分量化.建立了航天遥感相机成像链路模型,分析了大气程辐射对图像灰阶范围的影响.研制了动态钳位相机,实现了在相机硬件电路中减除模拟信号.在外场对动态钳位相机进行了实验验证,实验中利用MODTRAN软件计算大气程辐射并转换为相机钳位值.实验结果表明:本文方法可使相机低端信息得到充分利用,图像灰阶范围能够提高62%;在航天遥感相机中设计动态钳位能够利用低端量化信息,用更多的量化位数来表示地物目标信息,并可提高辐射分辨率,保留更多图像的细节信息.
A dynamic clamping method of space remote sensing camera is proposed in this paper, which realizes the quantification of scene information by reducing the atmospheric radiation value at the analog front end of the camera.The imaging link model of space remote sensing camera is established, On the gray scale range of the image.The dynamic clamp camera is developed and the analog signal is deducted from the hardware circuit of the camera.The dynamic clamp camera is verified in the outfield.The MODTRAN software is used to calculate the radiation of the large- The experimental results show that the proposed method can make full use of the low-end information of the camera and the image grayscale range can be increased by 62%. Designing the dynamic clamp in the space remote sensing camera can use the low-end quantization information and use more Of the quantified bits to represent the target information, and improve the resolution of radiation, to retain more details of the image information.