Water level measuring system and method based on digital image processing

Abstract

The invention discloses a water level measuring system and a water level measuring method based on digital image processing. The water level measuring system comprises a spherical buoy, a fixing rod, an image acquisition module, an image transmission module and an image processing module. The water level measuring method comprises the following steps: floating the spherical buoy along the fixing rod up and down through raise and fall of the water level; shooting a water surface by a positioned and orientated image acquisition module; transmitting an image to an image processing device by the image transmission module; and after the image processing device acquires the image, converting the image into a YUV (luma and chroma) color processing model, performing binarization processing, extracting out a spherical buoy object by a binary image connective region growing notation method, extracting out the edge of the spherical buoy object through edge detection, working out spherical center coordinates of the spherical buoy according to edge pixel coordinates of the extracted image, and thus working out the current water level height. The water level measuring system and the water level measuring method are not affected by water temperature, water quality, sediment concentration and other outside interference factors and are strong in adaptability; and the water level measuring system is simple in composition, convenient to install and easy to use.

Description

technical field [0001] The invention relates to the field of water level measurement, in particular to a water level measurement system and method based on digital image processing. Background technique [0002] my country is a country that lacks water resources but suffers from frequent floods. The monitoring of water conditions has always been the focus of the national water conservancy and agricultural departments. [0003] There are many ways to detect water level at present, and various water level gauges are commonly used, such as float type water level gauge, pressure (input) type water level gauge, ultrasonic water level gauge, radar water level gauge, etc., which have been widely used, but These water level gauges are easily affected by external factors such as water quality, water temperature, and sand content, and there are certain limitations in use, installation, and daily maintenance. [0004] As an important means of automation, informatization, and intellige...

AI Technical Summary

Problems solved by technology

The disadvantage of this patent is: the image is collected by the water level scale, because when in use, the color difference between the water level scale and the external environment is not large, so it is easy to cause the complexity of subsequent image processing

At the same time, in its water level monitoring method, because the difference between the collected images in the early stage and the environment is not large, it is necessary to perform multiple operations such as smoothing, morphological corrosion and expansion, which directly affects the accuracy of subsequent feature extraction, so there is measurement inaccuracy. The problem

In addition, because the water level scale is placed in the area where the water level is to be monitored, it is prone to inclination, so in the process of image processing, the water level scale in the extracted image must be corrected for tilt. As the processing steps increase, the measurement accuracy will inevitably be affected. make an impact

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