Underwater optical imaging system and method suitable for large-range shallow sea coral reef drawing

Abstract

The invention belongs to the technical field of underwater photography, and discloses an underwater optical imaging system and method suitable for large-range shallow sea coral reef drawing, and the system comprises a sensor main cabin, a power propulsion and adjustment module, a positioning module, and a communication module. A camera, a sounding sonar, a solar downlink irradiance measuring instrument, a water sample collecting device, an inertial measurement unit (IMU) and the like are arranged in the sensor main cabin; the power propulsion and adjustment module is arranged on the outer side of the sensor main cabin; the positioning module is arranged at the upper end of the sensor main cabin and is used for receiving a GPS positioning signal through a GPS receiving antenna; and the communication module is arranged at the upper end of the sensor main cabin and is used for performing data communication with a remote terminal through the communication signal receiving antenna. According to the invention, underwater monitoring images with high positioning precision can be shot, three-dimensional modeling of underwater targets and terrains can be carried out by using images with high overlapping degree, and the method and systemare used for distribution and area measurement of underwater ecosystems such as coral reefs and the like.

Description

Technical field [0001] The present invention belongs to the technical field of underwater photography, underwater optical imaging and particularly to a system and method suitable for large-scale mapping shallow reef. Background technique [0002] Coral reef ecosystems have special biological characteristics, growth areas and more remote from the range of human activities, have a more clean water conditions and good lighting conditions, mostly in tropical shallow water fringing reefs, atolls, barrier reefs and lagoons. Photographic camera observations of reefs below the surface, is the coral reef ecosystem monitoring, protection and restoration of an important means. [0003] At present, the common observation imaging device equipped with underwater coral reefs can be used can be divided into three types: First, the underwater robot photographic camera; Second, no boats and the ship was bottom photographic camera; Third, snorkeling diver diving or photographic camera. The above-de...

AI Technical Summary

Problems solved by technology

The above underwater imaging observation methods are difficult to meet the imaging monitoring needs of coral reef ecosystems. The main problems include: First, the resulting images do not include high-precision positioning and attitude information, so it is impossible to perform spatial measurement and it is difficult to geometrically locate the images and splicing, which do not meet the needs of large-scale monitoring of coral reef ecosystems; second, coral reef spectra and reflectance spectral information cannot be obtained directly or through calculation, especially reflectance spectra, which are important for the identification, type differentiation and health status of coral reefs. The objective assessment of

[0005] (1) The existing underwater imaging observation methods cannot carry out high positioning accuracy imaging, stitching and mapping

[0006] (2) Existing underwater imaging observation methods cannot obtain spectral imaging data of coral reef reflectance

[0009] (2) The existing underwater imaging methods either do not have the imaging capability of reflectance images, or use standard reflectors placed at underwater targets to indirectly calculate image reflectance, none of which can meet the needs of large-scale and high-precision mapping of underwater coral reefs needs

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