A liquid level measurement system and method based on monocular vision
A technology of liquid level measurement and monocular vision, applied in the field of image information, can solve problems such as limited measurement range, complicated operation, and easy aging
Active Publication Date: 2020-09-01
XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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[0003] In order to solve the technical problems that the traditional liquid level gauge will fail when the liquid temperature is lower than -40°C, the measurement range is limited, the operation is complicated, and it is easy to age, the present invention provides a liquid level measurement system and method based on monocular vision
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[0104] The following will clearly and completely describe the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative efforts all belong to the protection scope of the present invention.
[0105] like figure 1 As shown, the liquid level measurement system based on monocular vision provided by the present invention includes a laser, a monocular camera, an image acquisition unit, an image compression unit, a host computer display unit and an image processing unit;
[0106] There are three lasers, which are set above the measured liquid surface. The connection line of the three lasers is triangular, and is used to irradiate the measured liquid surface from three different directions, thus forming t...
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In order to solve the technical problems that traditional liquid level gauges will fail when the liquid temperature is lower than -40°C, have limited measurement range, are complex to operate, and are prone to aging, the present invention provides a liquid level measurement system and method based on monocular vision. Three fixed-position lasers are fixed around the camera and hit the laser beam on the liquid surface. Through a series of algorithms for processing the liquid surface image, the center of mass of the light spot on the liquid surface is extracted. Finally, the internal parameters of the camera and the extracted The pixel coordinates of the light spot centroid complete the liquid level measurement of the final liquid level. The working temperature range of the invention is not limited and can be as low as -100°C. At the same time, the measurement range is flexible and can reach tens to hundreds of meters, far exceeding the traditional liquid level meter. The measurement error can be controlled within 1%, which can meet the accuracy requirements. , and also has the advantages of low cost and simple operation.
Description
technical field [0001] The invention belongs to the technical field of image information, and relates to a liquid level measurement system and method based on monocular vision, which are used for real-time and accurate measurement of the liquid level in a storage tank. Background technique [0002] At present, the liquid level measurement of the liquid level is based on the liquid level gauge. The traditional liquid level gauge can only work in the working environment above -40°C. When the liquid temperature is lower than -40°C, the liquid level gauge will fail. The measurement range of the level gauge is up to 30m, and the measurement range is limited; in addition, the traditional level gauge also has problems such as high price, many parameters need to be set for the instrument, complicated operation, and easy aging. Contents of the invention [0003] In order to solve the technical problems that the traditional liquid level gauge will fail when the liquid temperature is...
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IPC IPC(8): G01F23/292G06T7/13G06T7/187G06T7/66G06T7/80G06T5/00
CPCG01F23/292G06T7/13G06T7/187G06T7/66G06T7/80G06T5/80
Inventor 任龙张辉张高鹏宋晓东张海峰
Owner XI'AN INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI