In the construction of large marine structures such as ships, the precise assembly of parts is imperative for ensuring the overall structure's strength and functionality. Currently, construction workers still use marking lines to assist with ship part assembly tasks, and conventional measuring tools are used to draw marking lines throughout the whole assembly process. Unfortunately, there is not yet a method for accurately assessing marking line errors. Hence, this article proposes a method for evaluating the marking line accuracy of a hull part. A progressive sampling method is applied to extract the edge point set and marking lines. An optimised marking evaluation can be obtained while preserving the details of the as-built model. In the proposed method, geometric features are used to extract edge elements from the as-built model and then register it with its as-designed counterpart instead of using the overall data for registration. In addition, the marking lines are extracted in HSV colour space instead of RGB colour space. Using the most common panels in a ship hull structure, we evaluated the accuracy of the marking lines for each hull plate and demonstrated the effectiveness of the pro-posed method. The proposed method has the potential to reduce the need for rework and increase the speed of ship fabrication.
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