Automated Activity Estimation of the Cold-Water Coral Lophelia pertusa by Multispectral Imaging and Computational Pixel Classification.

Liu, Hongbo, Büscher, Janina, Köser, Kevin, Greinert, Jens , Song, Hong, Chen, Ying and Schoening, Timm (In Press / Accepted) Automated Activity Estimation of the Cold-Water Coral Lophelia pertusa by Multispectral Imaging and Computational Pixel Classification. Journal of Atmospheric and Oceanic Technology . pp. 1-46. DOI 10.1175/JTECH-D-19-0139.1.

[img] Text
jtechd190139.pdf - Accepted Version
Restricted to Registered users only until 15 September 2021.

Download (14Mb) | Contact

Supplementary data:

Abstract

The cold-water coral Lophelia pertusa builds up bioherms that sustain high biodiversity in the deep ocean worldwide. Photographic monitoring of the polyp activity represents a helpful tool to characterize the health status of the corals and to assess anthropogenic impacts on the microhabitat. Discriminating active polyps from skeletons of white Lophelia pertusa is usually time-consuming and error-prone due to their similarity in color in common RGB camera footage. Acquisition of finer resolved spectral information might increase the contrast between the segments of polyps and skeletons, and therefore could support automated classification and accurate activity estimation of polyps. For recording the needed footage, underwater multispectral imaging systems can be used, but they are often expensive and bulky. Here we present results of a new, light-weight, compact and low-cost deep-sea tunable LED-based underwater multispectral imaging system (TuLUMIS) with eight spectral channels. A brunch of healthy white Lophelia pertusa was observed under controlled conditions in a laboratory tank. Spectral reflectance signatures were extracted from pixels of polyps and skeletons of the observed coral. Results showed that the polyps can be better distinguished from the skeleton by analysis of the eight-dimensional spectral reflectance signatures compared to three-channel RGB data. During a 72-hour monitoring of the coral with a half-hour temporal resolution in the lab, the polyp activity was estimated based on the results of the multispectral pixel classification using a support vector machine (SVM) approach. The computational estimated polyp activity was consistent with that of the manual annotation, which yielded a correlation coefficient of 0.957.

Document Type: Article
Research affiliation: OceanRep > GEOMAR > ZE Central Facilities > ZE-RZ Data Centre
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems > DeepSea Monitoring
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BI Biological Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1175/JTECH-D-19-0139.1
ISSN: 0739-0572
Contribution Number:
ProjectNumber
DSM32
Date Deposited: 21 Oct 2020 07:22
Last Modified: 21 Oct 2020 07:22
URI: http://oceanrep.geomar.de/id/eprint/50745

Actions (login required)

View Item View Item

Document Downloads

More statistics for this item...