红外热像仪综合性能的客观评价及实现技术

寇小明^1,2, 刘上乾¹, 洪鸣¹, 卢泉¹

1.西安电子科技大学技术物理学院;2.中船重工第705研究所



摘要:

为了改进红外热像仪综合性能指标的适用性并减小视觉感知引入的检测不一致性,研究了TOD检测方法及其机器视觉实现技术.针对MRTD方法在评价凝视阵列热像仪综合性能时的局限性,分析了TOD检测方法对凝视阵列热像仪动态场景检测、动态非均匀性校正等技术的适用性,通过在成像观测环节用人类视觉传递函数及心理认知模型取代人类视觉观测过程,用模糊函数抽取模拟热像仪信道模糊过程,用几何模板匹配取代视觉认知过程,实现了TOD指标检测过程的客观化.采用TOD检测方法可将热像仪综合性能指标的测量不确定度由±20%改善到8%,采用几何模板匹配过程实现机器判读时可进一步减小约1/2.采用TOD指标及机器视觉实现方法可有效提高凝视阵列热像仪综合性能指标的适用性和一致性.

关键词:  红外热像仪  综合性能  MRTD  TOD  模式匹配  性能评价

DOI：10.11918/j.issn.0367-6234.2010.09.026

分类号:TN216

基金项目:教育部科学技术重点研究资助项目(108114)



Objective evaluation and implementation for overall performance of thermal imaging system

KOU Xiao-ming^1,2, LIU Shang-qian¹, HONG Ming¹, LU Quan¹

1.School of Technical Physics,Xidian University,Xi’an 710071,China;2.705 Research Institute CSIC,Xi’an 710075,China)

Abstract:

In order to improve the applicability of overall performance of thermal imager and reduce the uncertainty introduced by human observation,TOD test method and its machine vision implementation were studied.As for the limitation of MRTD method for overall performance of staring array thermal imager,the adaptability of TOD method was analyzed under dynamic scene,dynamic non-uniformity correction and so on.By using human visual transfer function and psychological model to replace subjective observing procedure,using blur function and down sampling to simulate the signal transfer procedure,using geometric template matching to replace human perceptive processes,the objective measurement of TOD method was achieved.The measurement uncertainty of overall performance for staring array imager using TOD can be improved from ± 20% to 8%,which can be improved further by using the geometric template matching in machine interpretation procedure.The applicability and consistency of the overall performance of thermal imager can be improved effectively with the TOD method and its machine vision implementation.

Key words:  thermal imager  overall performance  MRTD  TOD  pattern matching  performance evaluation