An Image Measurement Method of Double-Pulse Sediment Transport Information
An image measurement and double-pulse technology, applied in the field of visual measurement, can solve problems such as many operation steps, low experimental efficiency, and complicated calculations, and achieve the effects of improving analysis speed, facilitating parallel operations, and improving computing efficiency and accuracy
Inactive Publication Date: 2016-05-11
DALIAN UNIV OF TECH
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[0004] Aiming at the problem of low experimental efficiency caused by isochronous experiments, complex calculations, and many operating steps in the process of sediment movement measurement experiments in marine engineering, this invention combines the principle of visual measurement with laser technology to propose a Image Measurement Method of Double-pulse Sediment Transport Information
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[0024] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
[0025] An image measurement method for dual-pulse sediment transport information, which is characterized in that it is composed of a camera, a pulse laser, and a PC with an interpolated image acquisition card; two industrial cameras with external control double exposure functions placed on the left and right The stereoscopic vision system is fixed at the place where the measured terrain 11 can be observed; two pulse lasers are equipped with their own pulse laser light guide arms for illumination; one of them is equipped with a dot matrix grating sheet 9, and the other is equipped with a negative lens 10 ; The setting port of the synchronous controller 2 is connected with the PC 1, and is used to set the control parameters of the synchronous controller 2; and the output terminal of the synchronous controller 2 is connected with the xenon lamp and the Q-swi...
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The invention provides a double-pulse-type sediment transport information image measuring method, and belongs to the technical field of vision measurement. Two video cameras which are arranged in a left-and-right mode form a stereoscopic vision system; one video camera is provided with a lattice grating piece, and the other video camera is provided with a negative lens; under the time sequence control of a synchronous controller, pulse lasers can generate lattice light and volume vertebral light alternately by the utilization of the lattice grating piece and the negative lens, and meanwhile, the cross-frame collection technology of the video cameras is used for obtaining lattice images with different angles and sediment images with different angles in a short time; a stereo matching position image of the sediment image obtained through second exposure is predicted through matching information of the lattice image obtained through first exposure, normalized covariance correlation matching is conducted according to preset grids, and finally space motion vectors of sediment are reconstructed according to calibration parameters of the video cameras. According to the method, space vector fields of grid nodes can be obtained through one-time analysis without halting.
Description
technical field [0001] The invention belongs to the technical field of visual measurement and relates to the measurement of sediment transport information, in particular to a method for three-dimensional reconstruction and motion measurement of a low-texture target. Background technique [0002] In marine engineering, it is often necessary to accurately measure the movement of sediment when studying the movement of sediment under the action of wind, waves, and currents and the effect of underwater facilities (such as submarine pipelines, underwater pile foundations, etc.) on sediment during erosion information. At present, the commonly used experimental method is: firstly make current and wave in the water tank, after a period of interaction between the water flow and the measured target, stop the current and wave making, and record the time at the same time; then wait for the water surface to stand still (for Ensure that the target no longer moves), use the laser scanning ...
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IPC IPC(8): G01M10/00
Inventor 杜海孟娟李木国臧志鹏
Owner DALIAN UNIV OF TECH