Machine-vision based liquid level detection device and method

A technology of liquid level detection and machine vision, which is applied in the direction of measuring devices, engine lubrication, machine/engine, etc., can solve the problems that ultrasonic liquid level measuring instruments are difficult to achieve high precision, insufficient analog conversion precision, and low detection accuracy. Achieve the effect of low cost, easy installation and strong anti-interference

CN102147281AInactive Publication Date: 2011-08-10HUNAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2011-08-10
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a machine-vision based liquid level detection device and method. In the method, algorithm processing is carried out on a field liquid level image acquired by using an infrared camera to obtain real-time liquid level height information so as to obtain the instant height of the liquid level. In order to obtain the height information of the liquid level accurately and efficiently, five self-designed algorithms including a cameral distortion correction algorithm, a self-adaptation detection coordinate setting algorithm, a liquid level line segmentation algorithm, a data filter algorithm and a data setting algorithm are used in the machine-vision based liquid level detection device; and meanwhile, in order to implement the algorithms effectively, a calibration manner is introduced in the invention and is applied to a target tracking process of a camera. In the invention, a single-chip microcomputer of an ARM (Advanced RISC (Reduced Instruction Set Computer) Machine) series is used as a main processor. By adoption of self-adaptation coordination setting, the device is not only suitable for open type and / or closed type liquid level detection environments but also suitable for mechanical equipment positioning and product counting, and has a very broad application prospect.
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Description

technical field

[0001] The invention relates to a liquid level detection device and method based on machine vision. technical background

[0002] Liquid level detection refers to the measurement of the height of the liquid by a certain method. This technology is widely used in many aspects such as daily life, industrial production, oil transportation, power stations and energy-saving control of urban sewage motors.

[0003] Water level detection at this stage can be roughly divided into two methods: contact and non-contact. One is to adopt the float type liquid level gauge, which belongs to the mechanical mode and is prone to failure. The second is to use a piezoresistive liquid level transmitter to detect the liquid level. This detection method is designed based on the principle that the pressure somewhere under the liquid surface is proportional to the distance from the liquid surface. Most of the products currently used are imported products, which are expensive and ha...

Examples

Embodiment 1

[0037] refer to figure 1 , the liquid level detection device based on machine vision is an embedded device, including the following parts: infrared camera or camera, embedded detection device, including liquid crystal display and touch screen, wired and wireless communication interface and control interface, etc. board, the object to be detected.

[0038] In this example, the embedded system is adopted, the Linux operating system is adopted, and ARM11 is the main chip to process the data collected in the system. The human-computer interaction of the embedded liquid level detection device adopts touch screen and color / black and white LCD display. Use the touch screen to set system parameters such as early warning liquid level and height. Use the liquid crystal display to display the liquid level height value and the liquid level change curve. The collected image information is transmitted to the system storage module by using the wired and wireless modules. The liquid level...