基于LM 98640的TDI-CCD暗场扣除方法

宁永慧; 郭汉洲; 余达; 赵庆磊

doi:10.3788/YJYXS20193406.0592

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基于LM 98640的TDI-CCD暗场扣除方法

图像处理 | 更新时间：2020-07-05

- 基于LM 98640的TDI-CCD暗场扣除方法
- Dark field deduction method of TDI-CCD based on LM 98640
- 液晶与显示 2019年34卷第6期页码：592-597
- 作者机构：
  
  1.中国科学院长春光学精密机械与物理研究所, 吉林长春 130031
  2.长春国科医工科技发展有限公司, 吉林长春 130031
- 作者简介：
  
  [ "宁永慧(1982-), 男, 吉林东丰人, 博士, 副研究员, 2013年于中国科学院长春光学精密机械与物理研究所获得博士学位, 主要从事CCD光电成像技术的研究。E-mail:way007@163.com" ]
- 基金信息：
  
  国家重点研究发计划(No.2016YFB0500100);民用航天预研项目(No.D040101);Nationd Key R & D Program(No.2016YFB0500100);Civil Aenospace Preresearch Project(No.D040101)
- DOI：10.3788/YJYXS20193406.0592
  中图分类号： V447.3;TP751.1
- 收稿日期：2018-11-25，
  
  录用日期：2019-4-9，
  
  纸质出版日期：2019-06-05
- 稿件说明：
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宁永慧, 郭汉洲, 余达, 等. 基于LM 98640的TDI-CCD暗场扣除方法[J]. 液晶与显示, 2019,34(6):592-597.

Yong-hui NING, Han-zhou GUO, da YU, et al. Dark field deduction method of TDI-CCD based on LM 98640[J]. Chinese journal of liquid crystals and displays, 2019, 34(6): 592-597.
宁永慧, 郭汉洲, 余达, 等. 基于LM 98640的TDI-CCD暗场扣除方法[J]. 液晶与显示, 2019,34(6):592-597. DOI： 10.3788/YJYXS20193406.0592.

Yong-hui NING, Han-zhou GUO, da YU, et al. Dark field deduction method of TDI-CCD based on LM 98640[J]. Chinese journal of liquid crystals and displays, 2019, 34(6): 592-597. DOI： 10.3788/YJYXS20193406.0592.

摘要

为了实现相关双采样模式下，视频处理器LM98640的暗电平扣除功能，设计了数字暗场扣除方法。通过获得TDI-CCD的暗场数据，进行统计分析，估算当前条件下的真实暗电平水平；通过设置LM98640的偏置寄存器，实现暗电平的模拟扣除功能；通过暗场灰度动态检测和实时更新设置，保证暗场在不同的温度水平下具有0~3的灰度均值；通过时序控制，保证偏置参数加载不影响图像内容；通过偏置参数功能分区，保证暗场扣除和偏置调整功能的完整性。实验结果表明，该方法在TDI-CCD成像系统长时间工作时，能有效控制暗场均值在0~3量化灰度范围。通过检测更新扣除机制，实现了对噪声的帧扣除，避免了行扣除不准确带来的噪声，有效降低了沿轨方向高频分量。

Abstract

A digital dark field deduction method was designed based on video processor LM98640 in the CDS mode. The real dark field value on that condition was calculated by the statistic of the obtained TDI-CCD dark field gray values. The dark field deduction in the analog circuit was realized by setting the offset registers of LM98640. By the real-time detection to the dark reference gray value and dynamic updating the offset parameters

the dark field values between 0 and 3 on average under different temperatures were ensured. By controlling the timing sequence

the image integrity was ensured while the offset parameters were set. The integrity of dark field deduction and bias adjustment function were ensured by separating the whole offset range into 2 parts. The results show that this method can make the dark field gray values within 3 LSB(least significant bit) when the TDI-CCD imaging system works for a long time. By detecting and updating the deduction mechanism

the frame deduction of noise is realized

the noise caused by inaccurate line deduction is avoided

and the high frequency noise along the orbit are effectively reduced.

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references

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