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为了实现对行间转移面阵CCD漏光现象的硬件实时校正,提出了一种基于暗像元区域漏光信号提取的方法,对大面阵行间转移CCD的漏光现象进行消除。首先,对暗像元区域的漏光信号进行提取,基于FPGA设计了实时的中值滤波算法,对提取的漏光信号进行滤波,消除随机噪声的影响。然后通过辐射定标实验确定了漏光区域信号所体现的有效像素区域饱和阈值,采用加权平均补偿的方法对大于饱和阈值的漏光区域进行补偿,最终完成漏光现象的校正。实验结果表明:通过FPGA实时中值滤波算法对提取的漏光信号进行滤波,系统延迟仅为3行图像数据读出时间,完全满足系统实时性的要求,结合加权平均补偿的漏光信号去除算法很好地还原了图像,彻底消除了漏光现象。
In order to realize the real-time hardware real-time correction of the leakage phenomenon of CCD in inter-row transfer lines, a method based on the extraction of the light leakage signal in the dark pixel area is proposed to eliminate the light leakage phenomenon of CCD in the large area array. Firstly, the light leakage signal in the dark pixel region is extracted, a real-time median filtering algorithm is designed based on FPGA, and the extracted light leakage signal is filtered to eliminate the influence of random noise. Then, the saturation threshold of the effective pixel region reflected by the light leakage region signal is determined through radiation calibration experiment. The light leakage region larger than the saturation threshold is compensated by the method of weighted average compensation, and finally the light leakage phenomenon is corrected. The experimental results show that the proposed algorithm can filter out the leaked light signal through the FPGA real-time median filtering algorithm, the system delay is only 3 lines of image data readout time, fully meet the real-time requirements of the system, combined with the weighted average compensation of the light leakage signal removal algorithm is very good Restore the image, completely eliminating the light leakage.