Method for measuring simulated seabed terrain based on active stereo vision technology and measuring equipment

Abstract

The invention discloses a method for measuring simulated seabed terrain based on an active stereo vision technology and measuring equipment. By the stereo vision technology, a binocular camera is arranged on the outside of an experimental trough, and seabed terrain changes are measured contactlessly through glass sidewalls of the experimental trough. Partial flow field will not be disturbed, and synchronous acquisition of the whole simulated seabed terrain can be realized. According to the invention, the active vision technology is used in underwater measurement. That is to say, by the utilization of auxiliary structured light irradiating underwater terrain through the glass sidewalls of the experimental trough, dense structured textures or dot arrays are formed on the terrain such that the camera can distinguish more easily. Meanwhile, quantity of terrain characteristic points is also increased. With the combination of the high-resolution camera, high-precision terrain data can be obtained. By the adoption of the method provided by the invention, noncontact, synchronous and high-precision measurement of the simulated seabed terrain can be realized, and corresponding problems existing in the prior art are solved.

Description

technical field [0001] The invention relates to a laboratory simulation seabed topography measurement method and a measurement device. Background technique [0002] In marine engineering, due to the long-term erosion and erosion of the seabed by ocean currents and waves and the passage of sand waves on the seabed, the foundations of offshore platforms, offshore wind power equipment, and submarine oil pipelines located in the seabed are exposed or even suspended, resulting in the overall structure destabilization, leading to serious disasters. The evolution of seabed topography is a dynamic process. Accurate and real-time measurement of seabed topography is an important basis for studying the mechanism and law of sand wave movement and local scour. [0003] Laboratory simulation is an important means to study the influence of seabed topography evolution on marine engineering structures. Laboratory simulations of seabed topographic changes include large-scale sand wave migra...

AI Technical Summary

Problems solved by technology

Asynchronous measurements can make it difficult to capture the rapidly changing topography of the entire simulated seabed in some special cases, such as the moment of scour initiation

[0004] In addition, the image acquisition based on passive vision usually has a small number of terrain feature points, and the computer is not easy to distinguish, and the accuracy of the acquired terrain data is not high.

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