Water surface target measuring method

A technology of water surface target and measurement method, applied in the field of three-dimensional measurement, can solve the problems of complex measurement method, time-consuming, labor-intensive, unsafe, etc.

Inactive Publication Date: 2015-04-01
HEBEI UNIV OF TECH
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a measurement method for water surface targets, which uses a calibration device with leveling to determine that the reference plane is parallel to the water surface, and derives a method based on the imaging principle of the camera and the theory of single-view computer vision. A measurement method for water surface targets, which overcomes the defects of time-consuming, laborious, unsafe, unstable measurement results and complex measurement methods existing in existing water surface target measurement methods

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Experimental program
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Effect test

Embodiment 1

[0104] The first step is to configure the equipment for surface target measurement:

[0105] These devices include a video camera 2, a calibration device 1 with leveling, a tripod 3, and a rectangular piece of wood with a length of 1 m and a width of 5 cm; The front of the device 1, after adjusting the angle, shoots the water surface target,

[0106] The above-mentioned calibration device 1 with leveling includes a reference plane 5, a checkerboard 6 and two level rulers 4, a square plastic plate with a specification of 50cm * 50cm is used as the reference plane 5, and a checkerboard 6 and two levels are fixed on it. A horizontal ruler 4, the checkerboard grid 6 is composed of 9×7 black and white squares of 28mm×28mm, placed on the lower right of the middle of the reference plane 5, the length of the two horizontal rulers 4 is 40cm, and the two horizontal rulers 4 They are perpendicular to each other and are respectively fixed on the left side and the top of the reference pla...

Embodiment 2

[0177] This embodiment is to increase the area measurement function of the water surface target in embodiment 1. The specific operation method is: find two points corresponding to the length of the water surface target and two points of the width of the water surface target according to the image, according to the sixth step and the second step in embodiment 1 The seven-step method solves the length and width of the water surface target, and obtains the area of ​​the water surface target=length×width.

Embodiment 3

[0179] This embodiment is to increase the volume measurement function of the water surface target in embodiment 1. The specific operation method is: find two points corresponding to the length of the water surface target and two points corresponding to the width of the water surface target according to the image. For the accuracy of measurement, use two According to the method of the sixth step and the seventh step in embodiment 1, the length and width of the water surface target are solved, and the point representing the height of the target is found from the image, and the method of intersecting two straight lines is used to obtain The vertical point of this point on the water surface, according to the fifth step, the sixth step and the seventh step in the embodiment 1, solves the height of the target, and obtains the volume=length*width*height of the water surface target.

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Abstract

The invention discloses a water surface target measuring method and relates to three-dimensional measurement of computer vision. A calibration device with a leveling function is used for determining that a reference plane is parallel to the water surface, and the water surface target measuring method is derived according to the imaging principle of a camera and the single-view computer vision theory. The method comprises steps as follows: configuring equipment for water surface target measurement, determining that the reference plane is parallel to the water surface, acquiring images, calculating the internal parameter of the camera, solving the normal vector of the water surface, adding a target height calculation module when necessary, performing measurement reconstruction, performing Euclidean reconstruction from measurement reconstruction and performing error analysis. The method overcomes defects that existing water surface target measuring methods are time-consuming, labor-consuming, unsafe and complex and measurement results are unstable.

Description

technical field [0001] The technical scheme of the invention relates to three-dimensional measurement of computer vision, in particular to a method for measuring water surface targets. Background technique [0002] Due to the openness and complexity of the water surface, it is difficult to measure the water surface target. Judging from the current published literature and technical means, there are mainly two methods for the measurement of water surface targets: manual measurement method and laser measurement method. Manual measurement method is time-consuming, laborious and unsafe; laser measurement method is a non-contact measurement method. The fluctuation of the laser beam into the water will produce a large diffuse reflection, resulting in unstable measurement results. Although the three-dimensional measurement method has been applied to the measurement of the target, CN103376071A discloses a three-dimensional measurement system and a three-dimensional measurement met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C11/00
CPCG01C11/00
Inventor 胡钊政张兰柏东芳赵斌夏克文刘国忠李冰
Owner HEBEI UNIV OF TECH
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