Tide staff water level measurement method based on dual-waveband imaging

Abstract

The invention discloses a tide staff water level measurement method based on dual-waveband imaging, and belongs to the technical field of water level measurement. A camera with a dual-waveband imagingfunction is adopted, and visible light and near-infrared images are used for system calibration and water level measurement links respectively. During the system calibration link, firstly, a measurement system is arranged and a tide staff image of the visible light is obtained; secondly, according to a standard pattern of a tide staff to be measured, a template image is designed; finally througha selected matching control point, a perspective projection transformation relation between the tide staff image and the template image is built; during the water level measurement link, firstly, a near-infrared tide staff image is obtained and then matched with the template image for rectification, binarization processing is conducted on the rectification image, waterline coordinates are measuredin a horizontal projection curve of the binarization image, and according to the physical resolution of the template image, the waterline coordinates are converted into an actual water level value. According to the tide staff water level measurement method based on dual-waveband imaging, the scales and characters on the tide staff do not need to be measured and identified, and the robustness of low-resolution images photographed under a complex site condition is high.

Description

technical field [0001] The invention relates to a method for measuring a water level with a water gauge, in particular to a method for measuring a water level with a water gauge based on dual-band imaging, and belongs to the technical field of water level measurement. Background technique [0002] Water level is one of the basic hydrological elements of rivers, lakes and reservoirs. Continuous and reliable water level monitoring is of great significance for water resource scheduling and flood control and drought relief. The water gauge records the height of the water level through readings. It is the most intuitive and simple measurement tool, and it has almost become the standard configuration of hydrological stations. However, traditional water gauge measurement requires manual timing observations, which is low in automation and labor-intensive. Existing automatic water level gauge mainly includes float type, pressure type, ultrasonic type and radar type etc. Float-type w...

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Problems solved by technology

[0008] Purpose of the invention: The present invention provides a method for measuring water level with a water gauge based on dual-band imaging, aiming at the difficulties of measuring water level with a water gauge under complex field conditions and the shortcomings of existing methods

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