Real-time correction of imaging nonuniformity for multi-TDICCD mosaic camera on hardware

ZHU Hong-yin; GUO Yong-fei; SI Guo-liang

doi:10.3788/OPE.20111912.3034

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Real-time correction of imaging nonuniformity for multi-TDICCD mosaic camera on hardware

Article | 更新时间：2020-08-12

- Real-time correction of imaging nonuniformity for multi-TDICCD mosaic camera on hardware
- Optics and Precision Engineering Vol. 19, Issue 12, Pages: 3034-3042(2011)
- 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,中国,130033
  2. 中国科学院研究生院,北京 100039
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20111912.3034
  CLC： V447.3;TP751.1
- Received：21 March 2011，
  
  Revised：21 June 2011，
  
  Published Online：25 December 2011，
  
  Published：25 December 2011
- 稿件说明：
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朱宏殷, 郭永飞, 司国良. 多TDICCD拼接相机成像非均匀性实时校正的硬件实现[J]. 光学精密工程, 2011,19(12): 3034-3042

ZHU Hong-yin, GUO Yong-fei, SI Guo-liang. Real-time correction of imaging nonuniformity for multi-TDICCD mosaic camera on hardware[J]. Editorial Office of Optics and Precision Engineering, 2011,19(12): 3034-3042
朱宏殷, 郭永飞, 司国良. 多TDICCD拼接相机成像非均匀性实时校正的硬件实现[J]. 光学精密工程, 2011,19(12): 3034-3042 DOI： 10.3788/OPE.20111912.3034.

ZHU Hong-yin, GUO Yong-fei, SI Guo-liang. Real-time correction of imaging nonuniformity for multi-TDICCD mosaic camera on hardware[J]. Editorial Office of Optics and Precision Engineering, 2011,19(12): 3034-3042 DOI： 10.3788/OPE.20111912.3034.

摘要

提出了一种基于现场可编程门阵列(FPGA)平台实现的成像非均匀性实时校正算法来解决遥感多时间延迟积分(TDI)CCD拼接相机存在的问题。首先介绍了拼接相机成像非均匀性(PRNU)的定义及其产生的原因

然后针对拼接相机的特点

提出了一种通道内用两点定标法、通道间用增益平均法、片间用自适应场景补偿法的复合非均匀性校正算法。从可靠性和实时性考虑

选择在相机信号处理FPGA硬件平台上实现校正算法

针对FPGA的运算能力改进算法并分析误差

同时给出星上定标和校正因子修正的方案。实验结果表明

该算法可将单片TDICCD的成像非均匀性从4.82%降低到0.27%

最终拼接图像的非均匀性降低到0.41%

且实时性好、效率高、可满足实际工程需求。

Abstract

A real-time imaing nonuniformity correction algorithm on a Field Programming Gate Array(FPGA) platform was proposed to modify the imaging nonuniformity of a multi Time Delay Intration(TDI)CCD mosaic camera. Firstly

the definition of Photo Response Nonuniformity(PRNU) and its generation in the multi-TDICCD mosaic camera were introduced. Then

the synthetical correction algorithm was presented

in which the two-point correction method was used in a single channel

gain averaging correction method among multi-channels and the scene-adaptive correction method among multi-TDICCDs. By considering the reliability and the influence of finite word-length of the FPGA

the synthetical correction algorithm was optimized and implemented on the signal processing FPGA platform. Furthermore

a scheme for modifying correction factors and spaceborne calibration were given. The experimental results indicate that the imaging nonuniformity can be decreased from 4.82% to 0.27% for a single TDICCD

and to 0.41% for a 3-TDICCD mosaic camera with the proposed correction algorithm.It also proves that this correction algorithm has high real time performance

good practicality and efficiency

and satisfies the requirements of target projects.

关键词

Keywords

references

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