라인 레이저의 산란에 강인한 심도 측정 방법Depth Measurement Method Robust against Scattering of Line Lasers
- Other Titles
- Depth Measurement Method Robust against Scattering of Line Lasers
- Authors
- 고광진; 연승호; 김재민
- Issue Date
- 2018
- Publisher
- 한국멀티미디어학회
- Keywords
- Line Laser; Least Square Method; Depth Measurement; Spline Curve
- Citation
- 멀티미디어학회논문지, v.21, no.2, pp.181 - 187
- Journal Title
- 멀티미디어학회논문지
- Volume
- 21
- Number
- 2
- Start Page
- 181
- End Page
- 187
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/4694
- DOI
- 10.9717/kmms.2018.21.2.181
- ISSN
- 1229-7771
- Abstract
- Line-laser beams are used for depth measurement of welding beads along the circumference of a pipe. For this, first we project a line-laser beam on an rotating pipe and take a sequence of images of the beam projected on the pipe using a CCD camera. Second, the projected line laser beam in each image is detected, converted into a thin curve. Finally measure the distance between the thinned curve and an imaginary line. When a line-laser beam is projected to a rough metal surface such as arc welding beads, the beam is severely scattered. This severe scattering makes the thinned curve perturbed. In this paper, we propose a thinning method robust against scattering of line lasers. First, we extract a projected line laser beam region using an adaptive threshold. Second, we model a thinned curve with a spline curve with control points. Next, we adjust the control points to fit the curve to the projected line-laser beam. Finally, we take a weighted mean of thin curves on a sequence of image frames. Experiments shows that the proposed thinning method results in a thinning curve, which is smooth and fit to the projected line-laser beam with small error.
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Collections - College of Engineering > School of Electronic & Electrical Engineering > 1. Journal Articles
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