Reducing uncertainty in wind turbine blade health inspection with image processing techniques

.............................................................................................................................. vi CHAPTER 1. GENERAL INTRODUCTION .............................................................................. 1 1.1 Background ........................................................................................................................ 1 1.2 Motivation ......................................................................................................................... 2 1.3 Research Problem .............................................................................................................. 4 1.4 Research Objectives .......................................................................................................... 5 1.5 Impact ................................................................................................................................ 6 1.6 Dissertation Organization .................................................................................................. 7 1.7 References ......................................................................................................................... 7 CHAPTER 2. LITERATURE REVIEW .................................................................................... 10 2.1 Threshold-based image processing .................................................................................. 10 2.2 Uncertainty in threshold-based image processing ........................................................... 11 2.3 Automated crack recognition and classification .............................................................. 12 2.4 References ....................................................................................................................... 13 CHAPTER 3. FEASIBILITY OF AUTOMATIC DECTION OF SURFACE CRACKS IN WIND TURBINES BLADES....................................................................................................... 16 3.1 Abstract ............................................................................................................................ 16 3.2 Introduction ..................................................................................................................... 16 3.3 Methodology .................................................................................................................... 18 3.3.1 Synthetic crack generation ........................................................................................ 19 3.3.2 Line detection............................................................................................................ 22 3.3.3 Edge detection ........................................................................................................... 23

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