Visual Measurement System of the Pitch Length of Large Scale Mooring Chains’ Five Neighboring Links

Journal of Shanghai Jiaotong University ›› 2011, Vol. 45 ›› Issue (10): 1552-1556.

• Automation Technique, Computer Technology • Previous Articles Next Articles

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)

Received:2010-11-03 Online:2011-10-31 Published:2011-10-31

Abstract

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.

Key words: baseline length, principal point, edge detection, vision measurement system, mooring chains

CLC Number:

TP 23

HU Wen-1, HU Chun-2, WANG Shi-Gang-1. Visual Measurement System of the Pitch Length of Large Scale Mooring Chains’ Five Neighboring Links[J]. Journal of Shanghai Jiaotong University, 2011, 45(10): 1552-1556.

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Visual Measurement System of the Pitch Length of Large Scale Mooring Chains’ Five Neighboring Links

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