Method and system for positioning and correcting video data by using submarine topography profile

Abstract

The invention relates to a method and a system for positioning and correcting video data by using a submarine topography profile. The method comprises the following steps of: performing equal-interval offset on a target survey line water depth profile in a grid layer of a target area to obtain each offset data sequence corresponding to the target survey line water depth profile; based on offset data in each offset data sequence corresponding to the target survey line water depth profile, drawing offset terrain profiles in batches; according to the original data sequence and each offset data sequence, a DTW dynamic time bending distance optimization algorithm is adopted to calculate the section similarity between the target survey line water depth section and each offset terrain section; and selecting the geographic position of the offset terrain profile map with the maximum profile similarity as the actual geographic position of the submarine video survey line water depth profile. According to the method, the terrain profile with the highest similarity with the water depth profile of the target measuring line can be quickly and accurately matched in the target area without using an ultra-short baseline positioning system, and the purpose of positioning and correcting the submarine video data is achieved.

Description

technical field [0001] The invention relates to the technical field of application of seabed solid mineral resources, in particular to a method and system for positioning and correcting video data by using seabed terrain profiles. Background technique [0002] Near-bottom camera is one of the most effective detection methods for seabed hydrothermal sulfide resource investigation, and the accuracy of seabed camera data positioning is the basis for further in-depth sulfide investigation and research. The near-bottom camera data is generally collected by the camera towed body towed by the ship near the seabed, and the positioning of the camera equipment is generally realized by means of an ultra-short baseline fixed on the near-bottom equipment. The ultra-short baseline measurement accuracy is high, but due to the measurement environment and other reasons, it will cause different degrees of false data, wrong data, or even missing data, which will bring difficulties to camera po...

AI Technical Summary

Problems solved by technology

[0004] (1) Due to the influence of factors such as dynamic changes in the marine environment, installation and calibration deviations of measuring instruments, measurement reliability of peripheral equipment, and accuracy of sound velocity measurement and correction, there will be large gross errors and continuous abnormal errors in ultra-short baseline positioning

[0005] (2) Since the ultra-short baseline positioning system is a kind of underwater acoustic positioning technology, for the underwater acoustic positioning system, the uneven distribution of underwater sound velocity will cause sound rays to bend, which will seriously affect the positioning accuracy of the system

[0006] (3) The data obtained through the ultra-short baseline positioning system will have a large number of error points and outliers, which will cause information misalignment in both time and space scales of the positioning data, and even some survey lines cannot find any information that can pass through. The method of processing the ultra-short baseline data itself to achieve positioning makes the surveyed video data unable to correspond to the actual geographical location, that is, it is impossible to accurately locate the sulfide mineral spots obtained through video, which seriously affects the use and analysis of video data Research

[0007] To sum up, at present, there are problems such as low precision and low accuracy in the positioning of seabed video data using ultra-short baselines. How to overcome the above problems has become a technical problem that needs to be solved urgently in this field.

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