Machine-vision based liquid level detection device and method

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.

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...

AI Technical Summary

Problems solved by technology

However, constrained by its own characteristics (such as being greatly affected by temperature changes, insufficient analog conversion accuracy, and greatly affected by fluctuations in the detection liquid level), it is difficult for ultrasonic liquid level measuring instruments to achieve high precision in a large range. The installation requirements are high, and professional installation is required, and when there are suspended solids, foam, and fluctuations in the detection liquid surface, the detection accuracy will be greatly reduced

Images