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Sensors 2016, 16(4), 543; doi:10.3390/s16040543

A Sea-Sky Line Detection Method for Unmanned Surface Vehicles Based on Gradient Saliency

National Key Laboratory of Science and Technology on Underwater Vehicle, Harbin Engineering University, Harbin 150001, China
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Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 7 February 2016 / Revised: 5 April 2016 / Accepted: 5 April 2016 / Published: 15 April 2016
(This article belongs to the Section Physical Sensors)
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Abstract

Special features in real marine environments such as cloud clutter, sea glint and weather conditions always result in various kinds of interference in optical images, which make it very difficult for unmanned surface vehicles (USVs) to detect the sea-sky line (SSL) accurately. To solve this problem a saliency-based SSL detection method is proposed. Through the computation of gradient saliency the line features of SSL are enhanced effectively, while other interference factors are relatively suppressed, and line support regions are obtained by a region growing method on gradient orientation. The SSL identification is achieved according to region contrast, line segment length and orientation features, and optimal state estimation of SSL detection is implemented by introducing a cubature Kalman filter (CKF). In the end, the proposed method is tested on a benchmark dataset from the “XL” USV in a real marine environment, and the experimental results demonstrate that the proposed method is significantly superior to other state-of-the-art methods in terms of accuracy rate and real-time performance, and its accuracy and stability are effectively improved by the CKF. View Full-Text
Keywords: unmanned surface vehicle; sea-sky line; gradient saliency; region growing; line support region unmanned surface vehicle; sea-sky line; gradient saliency; region growing; line support region
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Wang, B.; Su, Y.; Wan, L. A Sea-Sky Line Detection Method for Unmanned Surface Vehicles Based on Gradient Saliency. Sensors 2016, 16, 543.

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