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It is an important step to read draughts accurately in the process of draught surveys because inaccurate one could lead to a cause of disputes between all the interested parties. The draught reading is conducted by ship's officers or professional surveyors based on their visual observation even today. Therefore, there are some difficulties in keeping an accurate measurement or observer's safety under unfavorable conditions such as bad weather, strong swell and so forth. In this paper, the authors propose a novel draught reading method using image processing for supporting reading draughts. The method comprises some processing steps, detecting draught marks, stabilizing the hull motion and recognizing draught marks by template matching, and detecting waterline due to accumulated sequential inter-frame differences. Experimental results show that the proposed method attained high precision of the measurement.

A Draught Reading Method by Image Processing with the Robustness of Measurement Distance