Liquid level detection method based on vision and non-contact

Abstract

The invention discloses a liquid level detection method based on visual non-contact, including: S1. installing a camera, and calibrating the internal and external parameters of the camera, establishing a world coordinate system with the camera as the origin, and calculating the world coordinate system and The conversion relationship of the camera coordinate system; S2. Place a checkerboard at the bottom of the solution, use the camera to shoot the solution, and obtain a liquid surface image containing the checkerboard, and then perform corner detection on the checkerboard in the liquid surface image, and calculate the detection The coordinate information of the corner points in the world coordinate system; S3. according to the world coordinate system, the coordinate information of the corner points in the liquid surface image and the distance information of the corner points of the checkerboard, use the principle of refraction to model, and then Calculate the level information of the solution. The present invention calculates liquid level information through the principle of refraction index and camera calibration results, does not depend on high-precision instruments, has high cost performance, and only needs to be constrained under visual conditions, and has low dependence on the environment.

Description

technical field [0001] The invention belongs to the technical field of image processing, in particular to a liquid level detection method based on visual non-contact. Background technique [0002] The existing liquid level measurement methods include contact measurement methods and non-contact measurement methods. These two existing liquid level measurement methods have corresponding deficiencies. For example, the ancient and simple float type liquid level measurement method, The measurement accuracy is easily affected by buoyancy and will affect the quality of the liquid. The existing non-contact liquid level measurement methods also have problems such as high requirements for sensor precision, strong dependence on the environment, and low cost performance. The environmental effect of steam becomes worse, and photoelectric refraction depends on the signal quantity of output and reception, etc. Contents of the invention [0003] The purpose of the present invention is to ...

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Problems solved by technology

[0002] The existing liquid level measurement methods include contact measurement methods and non-contact measurement methods. These two existing liquid level measurement methods have corresponding deficiencies. For example, the ancient and simple float type liquid level measurement method, The measurement accuracy is easily affected by buoyancy and will affect the quality of the liquid. The existing non-contact liquid level measurement methods also have problems such as high requirements for sensor precision, strong dependence on the environment, and low cost performance. The environmental effect of steam becomes worse, and photoelectric refraction depends on the signal quantity of output and reception, etc.

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