Back to Search Start Over

A Low-Cost Stereo Video System for Measuring Directional Wind Waves

Authors :
Matheus Vieira
Pedro Veras Guimarães
Nelson Violante-Carvalho
Alvise Benetazzo
Filippo Bergamasco
Henrique Pereira
Source :
Journal of Marine Science and Engineering, Vol 8, Iss 11, p 831 (2020)
Publication Year :
2020
Publisher :
MDPI AG, 2020.

Abstract

Typical oceanographic instruments are expensive, complex to build, and hard to deploy and require constant and specialized maintenance. In this paper, we present a cheap and simple technique to estimate a three-dimensional surface elevation map, η(x,y,t), the directional spectrum, and the main sea state parameters using inexpensive smartphones. The proposed methodology uses Time Lagged Cross Correlation (TLCC) between the audio signals from two independent video records to perform the frame synchronization. This makes the system much easier to deploy, where the main requirement is a fixed or moving platform close to the sea. The time records are mostly limited by the equipment storage space and battery life, although it can be easily replaced or recharged. Here, we pose the basis for an inexpensive yet powerful stereo reconstruction device and discuss its capabilities and limitations. The smartphone system capabilities were illustrated here by near shore experiment, at Leme beach in the Southeast of Brazil, and the results were compared against a pressure sensor. For this particular setup, the root mean square error in terms of significant wave height is of the order of 11% with perfect estimation of the peak period. The results are promising and demonstrate the validity and applicability of the technique.

Details

Language :
English
ISSN :
20771312
Volume :
8
Issue :
11
Database :
Directory of Open Access Journals
Journal :
Journal of Marine Science and Engineering
Publication Type :
Academic Journal
Accession number :
edsdoj.4f6b3fd01c8040f0af7e78bea0e6a352
Document Type :
article
Full Text :
https://doi.org/10.3390/jmse8110831