| Li Wencan (李文灿)* **,Wen Yan* ***,Wang Dong*,Yao Dalei*.[J].高技术通讯(英文),2021,27(4):422~429 |
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| CCD signal acquisition and optimal digital denoise technology |
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| DOI：10.3772/j.issn.1006-6748.2021.04.011 |
| 中文关键词: |
| 英文关键词: charge-coupled device （CCD）, low noise, reset noise, digital correlated double sampling, optimal filter |
| 基金项目: |
| Author Name | Affiliation | | Li Wencan (李文灿)* ** | (*Xi’an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences, Xi’an 710119, P.R.China)
(**University of Chinese Academy of Sciences，Beijing 100049, P.R.China)
(***College of Automation, Northwestern Polytechnical University, Xi’an 710068, P.R.China) | | Wen Yan* *** | (*Xi’an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences, Xi’an 710119, P.R.China)
(**University of Chinese Academy of Sciences，Beijing 100049, P.R.China)
(***College of Automation, Northwestern Polytechnical University, Xi’an 710068, P.R.China) | | Wang Dong* | (*Xi’an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences, Xi’an 710119, P.R.China)
(**University of Chinese Academy of Sciences，Beijing 100049, P.R.China)
(***College of Automation, Northwestern Polytechnical University, Xi’an 710068, P.R.China) | | Yao Dalei* | (*Xi’an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences, Xi’an 710119, P.R.China)
(**University of Chinese Academy of Sciences，Beijing 100049, P.R.China)
(***College of Automation, Northwestern Polytechnical University, Xi’an 710068, P.R.China) |
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| 中文摘要: |
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| 英文摘要: |
| To reduce the charge-coupled device（CCD） readout noise and improve the detection ability under low illumination and dim targets, a new low-noise CCD signal processing technology—CCD digital denoise—is gradually being employed in aerospace detection and other fields. In this study, the main readout noise of CCD detectors and its characteristics are analyzed. A CCD digital denoise system and an experimental platform are designed as well as established by using a PCIe data acquisition card. According to the characteristics of readout noise, some digital filters are analyzed and designed based on distributed kernel coefficient, and the optimal kernel coefficients are obtained through iteration. Then, CCD signal and filter model are established, and the optimal filter is designed to apply to the digital denoise system. Finally, according to the image data obtained from the system, the performance of the digital denoise system and digital filtering algorithm is evaluated and compared. At 500kHz and 1MHz CCD readout rates, the denoising performance of the optimal filter designed in the experiment is 16%-32% higher than that of the digital filter with kernel distribution coefficient, and 50%-60% higher than that of the traditional correlated double sampling technology. |
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