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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| Format: | Article |
| Language: | English |
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MDPI AG
2016-10-01
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| Series: | Sensors |
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| Online Access: | http://www.mdpi.com/1424-8220/16/10/1646 |
| _version_ | 1811306381489209344 |
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| author | Hyun-Woo Cho Hyuk-Jin Yoon Jae-Chan Yoon |
| author_facet | Hyun-Woo Cho Hyuk-Jin Yoon Jae-Chan Yoon |
| author_sort | Hyun-Woo Cho |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-13T08:43:24Z |
| format | Article |
| id | doaj.art-6e6803874a63451c8ca87e1310b4f805 |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-04-13T08:43:24Z |
| publishDate | 2016-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-6e6803874a63451c8ca87e1310b4f8052022-12-22T02:53:48ZengMDPI AGSensors1424-82202016-10-011610164610.3390/s16101646s16101646Analysis of Crack Image Recognition Characteristics in Concrete Structures Depending on the Illumination and Image Acquisition Distance through Outdoor ExperimentsHyun-Woo Cho0Hyuk-Jin Yoon1Jae-Chan Yoon2Robotics and Virtual Engineering, University of Science and Technology, Uiwang-si 16105, KoreaKorea Railroad Research Institute, University of Science and Technology, Uiwang-si 16105, KoreaDepartment of Civil Engineering, Han-Yang University, Seoul 04763, KoreaThe 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.http://www.mdpi.com/1424-8220/16/10/1646concrete crackilluminationshooting distanceMTFimage processing |
| spellingShingle | Hyun-Woo Cho Hyuk-Jin Yoon Jae-Chan Yoon Analysis of Crack Image Recognition Characteristics in Concrete Structures Depending on the Illumination and Image Acquisition Distance through Outdoor Experiments Sensors concrete crack illumination shooting distance MTF image processing |
| title | Analysis of Crack Image Recognition Characteristics in Concrete Structures Depending on the Illumination and Image Acquisition Distance through Outdoor Experiments |
| title_full | Analysis of Crack Image Recognition Characteristics in Concrete Structures Depending on the Illumination and Image Acquisition Distance through Outdoor Experiments |
| title_fullStr | Analysis of Crack Image Recognition Characteristics in Concrete Structures Depending on the Illumination and Image Acquisition Distance through Outdoor Experiments |
| title_full_unstemmed | Analysis of Crack Image Recognition Characteristics in Concrete Structures Depending on the Illumination and Image Acquisition Distance through Outdoor Experiments |
| title_short | Analysis of Crack Image Recognition Characteristics in Concrete Structures Depending on the Illumination and Image Acquisition Distance through Outdoor Experiments |
| title_sort | analysis of crack image recognition characteristics in concrete structures depending on the illumination and image acquisition distance through outdoor experiments |
| topic | concrete crack illumination shooting distance MTF image processing |
| url | http://www.mdpi.com/1424-8220/16/10/1646 |
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