A high-precision wave height measurement method based on stereo vision

Abstract

The invention belongs to the field of stereoscopic vision measurement and specifically relates to a high-accuracy wave height measuring method based on stereoscopic vision. The method in the invention comprises the following steps: water surface pretreatment; feature image projection; image acquisition; feature point extraction and matching; calculation of three-dimensional height of the image; and drawing of the three-dimensional contour line the image. The invention also provides a high-accuracy water-surface wave height measuring system. According to the invention, a nanometer bubble technology is utilized to allow a water surface to turn uniformly milk-white, so the influence of the phenomena of transmittance, reflection and refraction of the water surface on optical imaging is reduced; the way of feature image projection is utilized, so a plurality of feature points are fabricated on the water surface; epipolar constraint and sift algorithm are combined to realize extraction and matching of the feature points of the image; and through utilization of a relative coordinate differentiation method, influence of system noise is reduced.

Description

technical field [0001] The invention belongs to the field of stereo vision measurement, in particular to a high-precision wave height measurement method based on stereo vision. Background technique [0002] Ocean waves are the most important ocean dynamic parameters. To understand the laws of ocean wave generation, development and subsidence, it is necessary to measure waves. At present, the commonly used wave height measuring instruments are resistive wave height meters, pressure wave height meters, capacitive wave height meters, and resistance and capacitance wave height meters. The input and output signals of the wave height meter are analog quantities, which can neither directly provide analysis data nor overcome the linearity errors of various sensors. In 2013, the Chinese invention patent (CN103134472A) installed a dual-axis inclination sensor, an accelerometer in the height direction and a GPS positioning system in the water measurement device, and used a wireless da...

AI Technical Summary

Problems solved by technology

The operation is relatively complicated, and the purpose of real-time measurement of the wave height in the area cannot be achieved

[0003] In summary, there is currently no convenient and practical non-contact measurement method that can accurately measure the height of waves in an area and draw a contour map of waves

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