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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Analysis of Crack Image Recognition Characteristics in Concrete Structures Depending on the Illumination and Image Acquisition Distance through Outdoor Experiments
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Analysis of Crack Image Recognition Characteristics in Concrete Structures Depending on the Illumination and Image Acquisition Distance through Outdoor Experiments

机译：通过室外实验分析照明与图像采集距离对混凝土结构裂缝图像识别特性的影响

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摘要

The effects of illumination and shooting distance on crack image recognition were investigated by examining cracks in images taken with a camera. In order to examine the effects, images of cracks in a concrete structure taken while varying the illumination and shooting distance in an outdoor environment were analyzed. The images were acquired at a daytime illumination of 52,000 lx and a night illumination of 13 lx. The crack specimen images produced for the experiment were taken by increasing the shooting distance from 5 m to 100 m in each illumination. On the basis of the analysis on the modulation transfer function (MTF) and contrast sensitivity of the crack images, the effects of illumination and shooting distance on the sharpness of the crack images were investigated. The minimum crack widths that can be identified under each illumination were analyzed using MTF10 and Weber contrast 0.1, respectively. It was found that as the shooting distance increases, the effects of illumination on crack recognition become greater.
机译：通过检查用相机拍摄的图像中的裂纹，研究了照明和拍摄距离对裂纹图像识别的影响。为了检查其效果，分析了在室外环境下改变照明和拍摄距离时所拍摄的混凝土结构裂缝的图像。图像是在52,000 lx的白天照明和13 lx的夜间照明下采集的。通过在每次照明中将拍摄距离从5 m增加到100 m来拍摄为实验产生的裂纹样本图像。在分析裂纹图像的调制传递函数（MTF）和对比度敏感度的基础上，研究了光照和拍摄距离对裂纹图像清晰度的影响。分别使用MTF10和Weber对比0.1分析了在每种照明下可以识别的最小裂缝宽度。发现随着射击距离的增加，照明对裂纹识别的影响变得更大。

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