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Underwater Fish Body Length Estimation Based on Binocular Image Processing

School of Mechanical, Electrical & Information Engineering, Shandong University, Weihai 264209, China
Mechanical & Electrical Engineering Department, Weihai Vocational College, Weihai 264210, China
Author to whom correspondence should be addressed.
Information 2020, 11(10), 476;
Received: 15 September 2020 / Revised: 3 October 2020 / Accepted: 10 October 2020 / Published: 12 October 2020
Recently, the information analysis technology of underwater has developed rapidly, which is beneficial to underwater resource exploration, underwater aquaculture, etc. Dangerous and laborious manual work is replaced by deep learning-based computer vision technology, which has gradually become the mainstream. The binocular cameras based visual analysis method can not only collect seabed images but also construct the 3D scene information. The parallax of the binocular image was used to calculate the depth information of the underwater object. A binocular camera based refined analysis method for underwater creature body length estimation was constructed. A fully convolutional network (FCN) was used to segment the corresponding underwater object in the image to obtain the object position. A fish’s body direction estimation algorithm is proposed according to the segmentation image. The semi-global block matching (SGBM) algorithm was used to calculate the depth of the object region and estimate the object body length according to the left and right views of the object. The algorithm has certain advantages in time and accuracy for interest object analysis by the combination of FCN and SGBM. Experiment results show that this method effectively reduces unnecessary information, improves efficiency and accuracy compared to the original SGBM algorithm. View Full-Text
Keywords: FCN; SGBM; body length; underwater; fish FCN; SGBM; body length; underwater; fish
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Cheng, R.; Zhang, C.; Xu, Q.; Liu, G.; Song, Y.; Yuan, X.; Sun, J. Underwater Fish Body Length Estimation Based on Binocular Image Processing. Information 2020, 11, 476.

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