Water gauge waterline visual detection method suitable for complex illumination conditions

Abstract

The invention discloses a water gauge water level line visual detection method suitable for complex illumination conditions. By utilizing a difference between a water gauge image and a water surface image, a gray scale mean difference of a gray image and an edge image is calculated, the maximum value of the two features is taken as an index for measuring the image difference, then a water level line detection method combining coarse positioning and fine positioning is adopted, and high robustness is achieved for water gauge water level line detection under the complex lighting conditions. According to the water gauge water level line visual detection method suitable for the complex illumination conditions, detailed information of a water gauge is provided under the condition that the images are blurred, water level line detection is performed with a single pixel as a step during the fine positioning, and the detection precision can reach a single pixel. The water gauge water level linevisual detection method is suitable for the conditions of natural illumination (daytime) and infrared illumination (nighttime), and false detections due to uneven distribution of image gray scales caused by the natural illumination and nighttime fill light can be effectively avoided.

Description

Technical field [0001] The invention relates to a visual detection method for the water level of a water gauge, in particular to a visual detection method of the water level of a water gauge suitable for complex lighting conditions. Background technique [0002] Water level is one of the basic hydrological elements of rivers, lakes and reservoirs. Since the water supply in cities and irrigation areas, rainstorm and flood flow, runoff and sediment and nutrient transport rate and other information usually need to be obtained based on water level measurements, continuous and reliable water level monitoring It is of great significance to comprehensively improve the level of early warning and forecasting of flood control and drought resistance and the daily supervision of rivers and lakes. The water gauge records the height of the water level through readings. It is the most intuitive and simple measurement tool; however, the traditional water gauge measurement requires manual and reg...

AI Technical Summary

Problems solved by technology

[0006] Purpose of the invention: The purpose of the present invention is to provide a visual detection method for the water level line of the water gauge suitable for complex lighting conditions, which can solve the problem in the prior art that the scale line of the water gauge and the characters are not clear, and the lighting at night is complicated. It is difficult to guarantee the detection accuracy under lighting conditions

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