CCD信号处理电路偏置漂移校正
为抑制CCD相机信号处理电路中由温度等原因引起的偏置漂移对图像质量造成的影响，提出了一种基于反馈的近实时偏置漂移校正方法。为了获得偏置在整个链路中的变化情况，对整个信号处理链路进行了分析；设计了两种数字低通滤波器，分别对获得的暗像元数据进行滤波；根据工程经验并辅以计算给出校正算法的有关参数；校正图像偏置漂移并对输出的图像进行比较分析。实验结果表明，在可变增益放大器增益为1．8的条件下，使用12bit精度的模／数转换器时偏置稳定在10个码值以下，基本满足精度高、稳定性好及抗干扰的要求。...
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| Published in | 电子技术应用 Vol. 38; no. 11; pp. 51 - 54 |
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| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
中国科学院长春光学精密机械与物理研究所,吉林长春130033
2012
中国科学院研究生院,北京100049%中国科学院长春光学精密机械与物理研究所,吉林长春,130033 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 0258-7998 |
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| Summary: | 为抑制CCD相机信号处理电路中由温度等原因引起的偏置漂移对图像质量造成的影响，提出了一种基于反馈的近实时偏置漂移校正方法。为了获得偏置在整个链路中的变化情况，对整个信号处理链路进行了分析；设计了两种数字低通滤波器，分别对获得的暗像元数据进行滤波；根据工程经验并辅以计算给出校正算法的有关参数；校正图像偏置漂移并对输出的图像进行比较分析。实验结果表明，在可变增益放大器增益为1．8的条件下，使用12bit精度的模／数转换器时偏置稳定在10个码值以下，基本满足精度高、稳定性好及抗干扰的要求。 |
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| Bibliography: | bias drift correcting ; CCD camera ; image processing ; low-pass filters Yin Ya＇nan1＇2, Wang Xiaodong1, Li Bingyu1 , Li Zhe1 （1.Changchun Institute of Optical, Fine Mechanics and Physics, Chinese Academy of Science, Changchun 130033,China; 2.Graduate University of Chinese Academy of Sciences, Beijing 100049,China） In order to restrain the impact on the image from the variation of bias drift caused by temperature and other rea- sons in signal processing circuit of CCD camera, the bias drift of the circuit is corrected by a near real-time method based on feedback. Firstly, the entire signal processing chain is analyzed to obtain the bias variation of every line image in the circuit. Then the corrected bias drift is calculated by filtering the data of dark pixel acquired in the image processing module. Finally, the image bias drift is corrected and the corrected image is output. The experimental results indicate that the bias of each line image is basi- cally able to maintain the same level after correcting. 11-230 |
| ISSN: | 0258-7998 |