共查询到14条相似文献,搜索用时 93 毫秒
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基于模糊模式识别红外成像系统TOD 参数测量 总被引:1,自引:0,他引:1
介绍了用于红外热成像系统性能评估的三角方向辨别阈值(TOD)法。通过对TOD参数测试理论的分析,探讨基于模糊模式识别的客观法红外热成像系统TOD测试的基本方法和硬件组成,给出实现客观法TOD测量的图像处理、特征提取和模糊综合评判方法。 相似文献
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红外成像导引头性能评估系统技术探讨 总被引:1,自引:0,他引:1
红外成像导引头性能评估系统技术探讨刘永昌(兵器工业总公司第203研究所陕西长安710111)本文综述了红外成像导引头性能评估系统的任务和国内外红外成像导引头性能评估技术发展的现状,介绍了红外成像导引头的主要实验测试内容和红外成像导引头性能评价系统的组... 相似文献
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介绍了用于红外热成像系统性能评估的三角方向辨别阈值( TOD) 法。通过对TOD
参数测试理论的分析,探讨基于模糊模式识别的客观法红外热成像系统TOD 测试的基本方法和硬件组成,给出实现客观法TOD 测量的图像处理、特征提取和模糊综合评判方法。 相似文献
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分析了红外成像系统现场性能预测的传统方法,针对传统方法的不足,提出了一种红外成像系统现场性能预测的新方法。该方法从外场实拍热图像中获取目标和背景的平均温差,然后利用TOD准则和目标概率传递函数,得到目标和背景表观温差与红外成像系统探测识别性能的关系,实现典型目标在外场典型环境下的探测识别概率预测。结果表明,该方法与试验数据有一致性。 相似文献
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目标传递概率函数是连接成像系统实验室度量性能与现场性能的桥梁.依据三角形方向鉴别阈值(TOD)性能度量思想,针对典型试验环境,.统计了不同距离处目标红外图像的识别概率;以三角形靶标的视觉锐度为基准,设计了无缝三角形网格划分算法,对典型识别概率的实测红外目标图像进行了等效三角形划分,确定了目标对应的等效三角形数目;然后,利用Weibull视觉心理测量函数拟合目标等效三角形样条数目与对应的识别概率数据,首次建立了基于三角形靶标的目标传递概率函数,为利用TOD曲线进行现场性能预测奠定了基础. 相似文献
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红外成像导引头性能评估方法研究唐帆(航空工业总公司第014中心洛阳471009)红外成像制导技术是当今精确制导技术发展的重点。如何对红外成像导引头性能进行全面、系统、客观的评估检测是一项重要的工作。传统的热成像系统性能评估是不够的,更为主要的是必须对... 相似文献
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红外成像导引头性能评估系统技术 总被引:3,自引:1,他引:2
本文综述了国内外红外成像导头性能评估技术的发展状况,概述了红外成像导引头性能评估系统的任务,介绍了红外成像导引头主要实验测试内容和红外成像导引头性能评价系统的组成,展望了该技术未来的发展趋势。 相似文献
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Xiao-rui Wang Xin Liu Jian-qi Zhang 《Journal of Infrared, Millimeter and Terahertz Waves》2007,28(7):587-593
The field performance prediction of infrared imaging system is an important subject in infrared imaging field. In this paper, a novel method for predicting TA (target acquisition) performance is proposed, which combines the TOD (triangle orientation discrimination) threshold curve with an improved contrast metric based on the temperature in target sub regions. Specifically, the target is first subdivided into some sub regions with different target/background differential temperatures according to its thermal structure distribution. The number of equivalent triangle patterns across each sub region is calculated utilizing its effective size, the apparent temperature difference line, and the TOD curve. Further, the total number of equivalent triangle patterns over the integral target is achieved. Combining the TOD criteria, the target acquisition ranges for different discrimination (detection, recognition, and identification) levels are obtained by solving a set of equations. Comparisons with the preliminary experimental results show that this new TA approach can provide reasonable prediction of field performance. 相似文献
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Xiao-rui Wang Jian-qi Zhang Zhuo-xiang Feng Fang-ming Hu 《Journal of Infrared, Millimeter and Terahertz Waves》2004,25(11):1645-1656
The TOD (triangle orientation discrimination threshold) metric, as a promising sensor performance measure, is suitable for all types of thermal imaging systems and corresponds to the field performance very well. Since this method was proposed, a great progress has been made in some aspects, such as experimental validation, field performance, and TOD sensor performance model. However, what is still missing is a TOD curve prediction model similar to MRTD (minimum resolvable temperature difference) equation. Here, an equation-based TOD performance model was first developed focusing on staring thermal imagers. Specifically, spatial distribution of the triangle standard test pattern is described quantitatively. Resolution transfer characteristic of the staring infrared imagers is modeled with linear system theory, and system noise is characterized with the introduction of three-dimensional noise model. The modulation effect of overall subsystem of staring thermal imager on the non-periodic triangle standard pattern is analyzed. The matched filter idea is adopted to characterize quantitatively the spatial integration of the eye to signal and various noise components over the triangle pattern area, and the perceived signal-to-noise ratio of the staring thermal imager is derived. Then, the TOD performance theoretical model is established. Comparing with experimental results, this theoretical model gives reasonable prediction of the TOD performance curve of staring thermal imagers. Although more tests and modifications are required, these preliminary results suggest that this model can be developed into a model that predicts the TOD for all kinds of sensors. 相似文献
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阐述了红外成像传感器性能表征的TODT度量方法;依据频谱理论,首先确定了三角形标准靶的空间频谱描述函数;利用匹配滤波器的概念分别推导了人眼/大脑系统通过红外成像传感器可感知的非周期三角形标准靶信号和噪声;以图像视觉感知信噪比为理论基础,首次建立了红外成像传感器的TODT性能模型,并给出了计算机仿真结果.与实验测量数据比较显示了此模型预测红外成像传感器TODT度量曲线的合理性. 相似文献