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| Visual Measurement System of the Pitch Length of Large Scale Mooring Chains’ Five Neighboring Links |
| HU Wen-1, HU Chun-2, WANG Shi-Gang-1 |
| (1. Institute of Electromechanical Design and Knowledge Based Engineering,Shanghai Jiaotong University, Shanghai 200240, China; 2. Center for Educational Technology，Jiangxi Science and Technology Normal University, Nanchang 330013, China) |
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Abstract A visual measurement method based on the baseline length of cameras was presented to measure the pitch length of five neighboring links of large scale three dimensional mooring chains with complex shape. The task is separated into two subtasks, including calibrating the baseline length of neighboring cameras and the horizontal distances between the five neighboring links’ edges and the principal point of the corresponding camera. The edge detection method and visual measurement method of five neighboring links were proposed. The experimental results show that the system can detect the edges precisely, and compute the pitch length with the relative error less than 0.2%, satisfying application requirements.
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Received: 03 November 2010
Published: 31 October 2011
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