Analysis of Crack Image Recognition Characteristics in Concrete Structures Depending on the Illumination and Image Acquisition Distance through Outdoor Experiments

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 environ...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2016-10, Vol.16 (10), p.1646-1646
Main Authors: Cho, Hyun-Woo, Yoon, Hyuk-Jin, Yoon, Jae-Chan
Format: Article
Language:English
Subjects:
Accuracy
Concrete
concrete crack
Concrete structures
Construction
Cracks
Fourier transforms
Illumination
Image acquisition
image processing
MTF
Nuclear power plants
Object recognition
Outdoor
Sensors
Shooting
shooting distance
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Summary: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.
ISSN:1424-8220
1424-8220
DOI:10.3390/s16101646