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Optical Engineering • Open Access

Automatic draft reading based on image processing
Author(s): Takahiro Tsujii; Hiromi Yoshida; Youji Iiguni

Paper Abstract

In marine transportation, a draft survey is a means to determine the quantity of bulk cargo. Automatic draft reading based on computer image processing has been proposed. However, the conventional draft mark segmentation may fail when the video sequence has many other regions than draft marks and a hull, and the estimated waterline is inherently higher than the true one. To solve these problems, we propose an automatic draft reading method that uses morphological operations to detect draft marks and estimate the waterline for every frame with Canny edge detection and a robust estimation. Moreover, we emulate surveyors’ draft reading process for getting the understanding of a shipper and a receiver. In an experiment in a towing tank, the draft reading error of the proposed method was <1  cm, showing the advantage of the proposed method. It is also shown that accurate draft reading has been achieved in a real-world scene.

Paper Details

Date Published: 14 October 2016
PDF: 9 pages
Opt. Eng. 55(10) 104104 doi: 10.1117/1.OE.55.10.104104
Published in: Optical Engineering Volume 55, Issue 10
Show Author Affiliations
Takahiro Tsujii, Osaka Univ. (Japan)
Hiromi Yoshida, Osaka Univ. (Japan)
Youji Iiguni, Osaka Univ. (Japan)


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