Method for achieving visual reconstruction of space coordinates of target point in water tank

A technology of spatial coordinates and target points, applied in the field of visual measurement

Inactive Publication Date: 2014-06-18
DALIAN UNIV OF TECH
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Problems solved by technology

[0008] Aiming at the influence of medium refraction on the reconstruction of the target point during the water tank experiment, the present invention combines the law of optical refraction with the principle of visual measurement, and proposes a method for visually reconstructing the spatial coordinates of the target point in the water tank

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  • Method for achieving visual reconstruction of space coordinates of target point in water tank
  • Method for achieving visual reconstruction of space coordinates of target point in water tank
  • Method for achieving visual reconstruction of space coordinates of target point in water tank

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Embodiment Construction

[0028] The embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0029] A method for visually reconstructing the spatial coordinates of a target point in a water tank, which is composed of two cameras 1; a transmission wire 2; a computer 3 and an experimental water tank 4; the two cameras 1 are fixed on the outside of the experimental water tank 4 and observe through the side wall 5 of the glass water tank The underwater target point 9 is connected to the computer 3 through the transmission wire 2; the refractive index when the imaging light 8 enters the side wall 5 of the tank from the air is n 1 , The refractive index of water entering from the side wall 5 of the sink is n 2 , The thickness of the side wall 5 of the water tank is d, the distance between the optical center of the left camera and the side wall 5 of the water tank is h, and the optical center coordinates of the left camera (x 0 ,y 0 ,z 0 ); The incident...

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Abstract

The invention disclose a method for achieving visual reconstruction of the space coordinates of a target point in a water tank and belongs to the technical field of visual measurement. Two cameras (1), transmission wires (2), a computer (3) and the experimental water tank (4) are included, wherein the two cameras (1) are fixed outside the experimental water tank (4), used for observing the underwater target point (9) through the side wall (5) of the glass water tank and connected with the computer (3) through the transmission wires (2). The distorted coordinates are corrected through system calibration, coordinate system direction correction, target location and the like based on the geometrical relationship of light in stereoscopic vision imaging so as to obtain the real position of the underwater target point (9). According to the method, influence of refraction of media is fully taken into account, the coordinates of the underwater target point (9) are corrected without additionally arranging any testing device, and the real position of the underwater target point (9) is accurately obtained.

Description

Technical field [0001] The invention belongs to the technical field of vision measurement, relates to the problem of three-dimensional reconstruction of target points under multi-media, and particularly relates to a method for obtaining spatial coordinates of underwater target points in a glass tank. Background technique [0002] In marine engineering model tests, it is often necessary to perform motion analysis on the target objects in the experimental tank, such as particle tracing velocity analysis, underwater sedimentation experiment, and deformation analysis of underwater cages, so how to accurately and quickly obtain the target The coordinates of the points are particularly important. Vision measurement technology reconstructs the three-dimensional space coordinate information of the target through image acquisition and analysis. It has the advantages of non-contact, high accuracy, and wide measurement range, which can well meet the requirements of model tests. However, wh...

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Application Information

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IPC IPC(8): G01B11/00
Inventor 杜海孟娟李木国
Owner DALIAN UNIV OF TECH
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