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

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