| 几种直方图变换法在输电接头红外热像增强中的对比研究 |
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| 引用本文： | 齐超,韩金龙,梁浩,齐赛. 几种直方图变换法在输电接头红外热像增强中的对比研究[J]. 光学技术, 2010, 36(5) |
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| 作者姓名： | 齐超 韩金龙 梁浩 齐赛 |
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| 作者单位： | 哈尔滨工业大学,哈尔滨,150001;黑龙江省计量检定测试院,哈尔滨,150036;齐齐哈尔电业局,齐齐哈尔,161005 |
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| 基金项目： | 中国博士后科研基金,哈工大研究生主干课建设基金 |
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| 摘 要： | 由红外热像仪直接得到的热像会受很多外来因素的干扰而致使图像模糊不清、对比度差,由此在故障诊断过程中,需要对热像进行后续增强处理。总结了影响热故障红外检测准确性的外部因素,分析了输电接头热像的基本特征,采用了基于平方根灰度变换直方图修正和全局均衡化两种方法对热像进行了增强处理。在分析上述两种方法优劣的基础上,提出了一种基于线性平滑滤波的局部均衡化方法。结果表明,基于线性平滑滤波的局部均衡化方法对于处理输电接头热像更有效。
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| 关 键 词： | 红外热像 故障诊断 直方图 平滑滤波 |
Comparative study on thermal image enhancement of transmission line joints using different histogram transformation methods |
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| QI Chao,HAN Jinlong,LIANG Hao,QI Sai. Comparative study on thermal image enhancement of transmission line joints using different histogram transformation methods[J]. Optical Technique, 2010, 36(5) |
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| Authors: | QI Chao HAN Jinlong LIANG Hao QI Sai |
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| Abstract: | The thermal images directly obtained from infrared imaging system are usually blurred and contrast is low because of several external factors.So image enhancement is important in fault diagnosis.External factors affecting detection accuracy are summarized.The basic features of thermal images of transmission line joints are analyzed.The thermal images are enhanced using histogram modification based on the square root transformation function and global histogram equalization.In analyzing the merits of the two methods mentioned,a local area histogram equalization algorithm based on linear smoothing filter is presented.Finally,results show that it is a more efficient method for enhancing thermal images of transmission line joints. |
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| Keywords: | thermal imaging fault diagnosis histogram smoothing filter |
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