Image-Based Damage Assessment for Underwater Inspections PDF Download
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Author: Michael O’Byrne
Publisher: CRC Press
ISBN: 1351052578
Category : Technology & Engineering
Languages : en
Pages : 216
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Book Description
Inspection is crucial to the management of ageing infrastructure. Visual information on structures is regularly collected but very little work exists on its organised and quantitative analysis, even though image processing can significantly enhance these inspection processes and transfer real financial and safety benefits to the managers, owners and users. Additionally, new opportunities exist in the fast evolving sectors of wind and wave energy to add value to image-based inspection techniques. This book is a first for structural engineers and inspectors who wish to harness the full potential of cameras as an inspection tool. It is particularly directed to the inspection of offshore and marine structures and the application of image-based methods in underwater inspections. It outlines a set of best practice guidelines for obtaining imagery, then the fundamentals of image processing are covered along with several image processing techniques which can be used to assess multiple damage forms: crack detection, corrosion detection, and depth analysis of marine growth on offshore structures. The book provides benchmark performance measures for these techniques under various visibility conditions using an image repository which will help inspectors to envisage the effectiveness of the techniques when applied. MATLAB® scripts and access to the underwater image repository are included so readers can run these techniques themselves. Practising engineers and managers of infrastructure assets are guided in image processing based inspection. Researchers can use this book as a primer, and it also suits advanced graduate courses in infrastructure management or on applied image processing.
Author: Michael O’Byrne
Publisher: CRC Press
ISBN: 135105256X
Category : Technology & Engineering
Languages : en
Pages : 238
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Book Description
Inspection is crucial to the management of ageing infrastructure. Visual information on structures is regularly collected but very little work exists on its organised and quantitative analysis, even though image processing can significantly enhance these inspection processes and transfer real financial and safety benefits to the managers, owners and users. Additionally, new opportunities exist in the fast evolving sectors of wind and wave energy to add value to image-based inspection techniques. This book is a first for structural engineers and inspectors who wish to harness the full potential of cameras as an inspection tool. It is particularly directed to the inspection of offshore and marine structures and the application of image-based methods in underwater inspections. It outlines a set of best practice guidelines for obtaining imagery, then the fundamentals of image processing are covered along with several image processing techniques which can be used to assess multiple damage forms: crack detection, corrosion detection, and depth analysis of marine growth on offshore structures. The book provides benchmark performance measures for these techniques under various visibility conditions using an image repository which will help inspectors to envisage the effectiveness of the techniques when applied. MATLAB® scripts and access to the underwater image repository are included so readers can run these techniques themselves. Practising engineers and managers of infrastructure assets are guided in image processing based inspection. Researchers can use this book as a primer, and it also suits advanced graduate courses in infrastructure management or on applied image processing.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: MITRE CORP MCLEAN VA JASON PROGRAM OFFICE.
Publisher:
ISBN:
Category :
Languages : en
Pages : 105
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Book Description
Structural assessment and repairability of the steel 'H' piles supporting Pier Lima, Naval Station, Guantanamo Bay, Cuba are presented. Field data gathering techniques included visual inspection and measurement, still photography, and underwater television. Areas of inspection included existing pile jackets, detailed underwater inspections of piles, pile-pile cap connections, and the existing fender system. Analysis was conducted using field data and government-furnished information. Scope of work was limited to assessment of piles on singular basis, with pier system comments and conclusions included in general terms. The pier was found to have only approximately half of its original capacity. Re-jacketing most of the piles with concrete jackets, re-securing pile-pile cap connections, and installation of a new fender system and batter piles is recommended as a cost effective repair to bring the pier to approximately 90 percent of its original capacity.
Author: Thomas S. Jones
Publisher:
ISBN:
Category : Composite materials
Languages : en
Pages : 7
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Book Description
Author: Ali Salehzadeh Nobari
Publisher: World Scientific
ISBN: 178634498X
Category : Technology & Engineering
Languages : en
Pages : 256
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Book Description
In the oil and gas industries, large companies are endeavoring to find and utilize efficient structural health monitoring methods in order to reduce maintenance costs and time. Through an examination of the vibration-based techniques, this title addresses theoretical, computational and experimental methods used within this trend.By providing comprehensive and up-to-date coverage of established and emerging processes, this book enables the reader to draw their own conclusions about the field of vibration-controlled damage detection in comparison with other available techniques. The chapters offer a balance between laboratory and practical applications, in addition to detailed case studies, strengths and weakness are drawn from a broad spectrum of information.
Author: Ching Ying Yeap
Publisher:
ISBN:
Category :
Languages : en
Pages : 330
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Book Description
Author:
Publisher:
ISBN:
Category : Ecological risk assessment
Languages : en
Pages : 87
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
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Book Description
To automatically enhance and restore images, especially those taken from underwater environments where scattering and absorption by the medium strongly influence the imaging results even within short distances, it is critical to have access to an objective measure of the quality of images obtained. This contribution presents an approach to measure the sharpness of an image based on the weighted gray-scale-angle (GSA) of detected edges. Images are first decomposed by a wavelet transform to remove random and part medium noises, to augment the chances of true edge detection. Sharpness of each edge is then determined by regression analysis to determine the slope between gray-scale values of edge pixels versus locations, which is the tangent of an angle based on gray scale. The overall sharpness of the image is the average of each measured GSAs, weighted by the ratio of the power of the first-level decomposition details, to the total power of the image. Adaptive determination of edge widths is facilitated by values associated with image noise variances. To further remove the noise contamination, edge widths less than corresponding noise variances or regression requirements are discarded. Only horizontal edge widths are used in this study. Standard test images as well as those taken from the field are compared subjectively. Initial restoration results from field-measured underwater images based on this approach also are presented and discussed.
Author: Federal Civil Defense Administration
Publisher:
ISBN:
Category :
Languages : en
Pages : 53
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Book Description
