BibTeX
@MISC{December_oleknudsen,
author = {Phd Thesis December and Ole Knudsen and Odense Steel Shipyard and Coverpage Notes},
title = {Ole Knudsen},
year = {}
}
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Abstract
iv Abstract This dissertation is concerned with the introduction of vision-based applications in the ship building industry. The industrial research project is divided into a natural sequence of developments, from basic theoretical projective image generation via CAD and subpixel analysis to a description of an implementation in real production environments. The theory for projection of world points into images is concentrated upon the direct linear transformation (DLT), also called the Extended Pinhole model, and the stability of this method. A complete list of formulas for calculating all parameters in the model is presented, and the variability of the parameters is examined and described. The concept of using CAD together with vision information is based on the fact that all items processed at OSS have an associated complete 3D CAD model that is accessible at all production states. This concept gives numerous possibilities for using vision in applications which otherwise would be very difficult to automate. The requirement for low tolerances in production is, despite the huge dimensions of the items involved, extreme. This fact makes great demands on the ability to do robust subpixel estimation. A new method based on cross correlation is presented. Working with vision in harsh environments with few possibilities for controlling light, vibrations, electrical noise etc. requires knowledge about all factors and components in the vision system, which can possible influence the image generated. A description of the experience achieved during the project is provided. The project is industrial oriented. An essential part of the project has been focused on the possibilities for immediate use of the results. A full implemented application doing vision based positioning is d...
Keyphrases
ole knudsen great demand new method vision-based application direct linear transformation immediate use industrial research project low tolerance numerous possibility electrical noise etc production state huge dimension world point vision system vision information subpixel analysis real production environment basic theoretical projective image generation iv abstract cross correlation essential part complete list harsh environment ship building industry extended pinhole model cad model natural sequence
