Dolphin movement direction recognition using contour-skeleton information
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Dolphin movement direction recognition using contour-skeleton information Hong Qi 1,2 & Mingzhu Xue 1 & Xianglong Peng 1 & Chong Wang 1 & Yu Jiang 1 Received: 3 April 2020 / Revised: 27 June 2020 / Accepted: 18 August 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract
Detecting and tracking social marine mammals, including dolphins, can help to explain their social dynamics, predict their behavior, and measure the impact of human interference. The underwater environment is very special and different from the land environment: acoustic recorders are the main equipment for researchers to track dolphins at a long distance. Close-range detection of visual data is often seriously affected by the underwater environment, because the underwater environment is highly dynamic and the light source has attenuation in the deep water. Nonetheless, compared with acoustic information, visual data can provide more detailed information at low cost. The videos and images of dolphins provide researchers with great convenience in studying the body structure and social behavior of dolphins. At the same time, dolphin movement direction recognition helps researchers to learn more about dolphins through a series of accurate movement data. In this paper, we proposed an approach to detect the movement direction of dolphins effectively. First, the contours and skeletons are detected, which could reduce the impact of wrong detections significantly. And then another CNN-based model obtains the movement directions with feature images extracted from the previous steps. The experiment result shows the correctness and efficiency of the proposed method. Keywords Deep learning . Dolphin movement . Direction recognition
1 Introduction Dolphin is a general term for a class of aquatic mammals. It is a small or medium-sized toothed whale. It widely lives in the world’s oceans. It is also distributed in the inland
* Yu Jiang [email protected]
1
College of Computer Science and Technology , Jilin University , Changchun 130012, China
2
Key Laboratory of Symbolic Computation and Knowledge Engineering of Ministry of Education , Jilin University , Changchun 130012, China
Multimedia Tools and Applications
sea and the brackish water near the river mouth. Some species are found in inland rivers. Dolphins are the fastest moving mammals in the water. It has a well-developed sonar system, mainly relies on the echo location function when it is active, and has excellent hearing in water and air. They have a good memory and can learn many movements under human training. They are one of the most intelligent animal families, with a gentle, friendly, lively and active character. Some dolphins are highly social species, living in large groups (sometimes more than 100,000 individuals), showing many interesting social behaviors. There are many ways of cooperation among members of a group. For example, dolphins in a group sometimes attack sharks and kill them by hitting them. Members also work together to help injured or sick ind
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