Adaptive nonuniformity correction and hardware implementation of IRFPA

CAO Yang; JIN Wei-qi; LIU Chong-liang; LIU Xiu

doi:10.3788/OPE.20111912.2985

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Adaptive nonuniformity correction and hardware implementation of IRFPA

Article | 更新时间：2020-08-12

- Adaptive nonuniformity correction and hardware implementation of IRFPA
- Optics and Precision Engineering Vol. 19, Issue 12, Pages: 2985-2991(2011)
- 作者机构：
  
  北京理工大学光电学院光电成像技术与系统教育部重点实验室北京,100081
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20111912.2985
  CLC： TN215
- Received：28 October 2010，
  
  Revised：24 December 2010，
  
  Published Online：25 December 2011，
  
  Published：25 December 2011
- 稿件说明：
移动端阅览
曹扬, 金伟其, 刘崇亮, 刘秀. 红外焦平面阵列的自适应非均匀性校正及硬件实现[J]. 光学精密工程, 2011,19(12): 2985-2991

CAO Yang, JIN Wei-qi, LIU Chong-liang, LIU Xiu. Adaptive nonuniformity correction and hardware implementation of IRFPA[J]. Editorial Office of Optics and Precision Engineering, 2011,19(12): 2985-2991
曹扬, 金伟其, 刘崇亮, 刘秀. 红外焦平面阵列的自适应非均匀性校正及硬件实现[J]. 光学精密工程, 2011,19(12): 2985-2991 DOI： 10.3788/OPE.20111912.2985.

CAO Yang, JIN Wei-qi, LIU Chong-liang, LIU Xiu. Adaptive nonuniformity correction and hardware implementation of IRFPA[J]. Editorial Office of Optics and Precision Engineering, 2011,19(12): 2985-2991 DOI： 10.3788/OPE.20111912.2985.

摘要

针对长时间工作或环境剧烈变化时红外焦平面阵列(IRFPA)器件易产生条纹状非均匀性的问题

研究了在不遮挡成像视场条件下它的动态非均匀性校正(NUC)及其硬件实现技术。介绍了基于场景的改进恒定统计NUC(ICS-NUC)方法

即通过纵向通道间的统计量均衡策略实现对条纹非均匀性的抑制

并引入遗忘因子通过帧间迭代实现非均匀性的动态校正。描述了基于非制冷IRFPA组件在BF561 DSP平台的ICS-NUC处理流程

并实现了ICS-NUC的均值法(ICSA)和中值法(ICSM)

从而有效地动态校正条纹非均匀性

提高红外图像质量。实验表明

经过ICS-NUC处理

减弱了红外图像的条纹噪声

使用ICSA和ICSM法使IRFPA组件的非均匀性从3.43%分别降低至1.82%和0.91%

连续运行4 h后仍可使组件非均匀性从漂移后的5.05%降至0.92%。提出的方法为后续高性能热成像系统的研究和应用奠定了技术基础。

Abstract

Infrared Focal Plane Array (IRFPA) is easy to produce a fringe nonuniformity (NU) when it works for long hours or in a changed environment. Aiming at this problem

a dynamic Nonuniformity Correction(NUC) method was proposed in no covering imaging fields and its hardware realization technology was investigated. A scene-based algorithm

Improved Constant Statistics Nonuniformity Correction (ICS-NUC) was presented

in which the fringe NU was reduced by balancing the statistics of vertical channels

and a dynamic NUC was realized by using a forgetting factor in inter-frame iterative process. The ICS-NUC algorithm flow based on an uncooled IRFPA module with BF561 DSP platform was described. Then

two ICS-NUC algorithms

ICS by Average (ICSA) and ICS by Median (ICSM)

were implemented on the platform. By these ways

the fringe NU was corrected dynamically

and whole the infrared image quality was improved. The experimental results show that the fringe NU of IR image is reduced after ICS-NUC and the NU of IRFPA module is decreased from 3.43% to 1.82% by ICSA and 0.91% by ICSM

respectively. After continuous operation by four hours

the NU of IRFPA module is still decreased from 5.05% (drifted) to 0.92% by using ICSM.It concludes that the realization of ICS-NUC algorithm on IRFPA module can lay a technical foundation for the following study and applications of high-performance thermal imaging systems.

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references

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