Water level measuring method based on binocular stereoscopic vision

Through the water level measurement method based on binocular stereo vision, the iteratively optimized semi-global SGM stereo matching and RANSAC plane fitting technology solves the problem of low accuracy in complex lighting conditions, and realizes high-precision and low-cost water level measurement, which is suitable for a variety of complex water body scenes.

CN119810041AActive Publication Date: 2025-04-11HOHAI UNIV
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Patent Information

Application Number
CN202411849382.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-16
Publication Date
2025-04-11
Estimated Expiration
2044-12-16

AI Technical Summary

Technical Problem

The existing water level measurement technology has low accuracy under complex lighting conditions, especially in water bodies affected by seawater such as high sand content and estuaries, which have temperature and time drift problems, and is not suitable for measuring sections with severe siltations and gentle slopes.

Method used

The water level measurement method based on binocular stereo vision is adopted, and the parallax information is optimized through the iteratively optimized semi-global SGM stereo matching method, and the matching accuracy of weak texture areas is improved. The three-dimensional point cloud is plane fitted through the RANSAC method to generate horizontal plane equations to obtain the water level value.

Benefits of technology

High-precision water level measurement is achieved in many scenarios such as different light, water flow, floating objects, etc., which reduces the complexity of the algorithm and improves the accuracy of obtaining water level values. It is suitable for measuring sections with severe siltations and gentle slopes.

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Abstract

The invention discloses a water level measurement method based on binocular stereoscopic vision. The method comprises the following steps that model selection is conducted on a binocular camera according to an actual measurement scene; horizontally erecting a binocular camera on a river bank, adjusting a pitch angle to enable left and right views to cover a water surface area under a water level full range, and synchronously acquiring water surface images of the left and right views by using the binocular camera; acquiring a corresponding disparity map pixel by pixel by adopting an iterative optimization semi-global stereo matching method; based on a calibration result of the binocular camera, obtaining a three-dimensional point cloud coordinate value of the water surface image by using a relationship between parallax and depth; performing plane fitting on the point cloud by using an RANSAC algorithm to generate a horizontal plane equation; calculating the distance from the optical center of the left camera to the horizontal plane, and converting the elevation of the camera to obtain the water level. According to the invention, the shore-based arrangement of the instrument can be realized, the water level can be measured remotely in an inclined manner, the measurement does not depend on any reference object in contact with a water body such as a water gauge, the frame-while-frame measurement can be realized in severe environments such as a high flood period, and the device is particularly suitable for water level emergency monitoring.
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