Water level detection method, device, equipment, storage medium and system

A water level detection device, applied to a respiratory humidification apparatus, the respiratory humidification apparatus comprising a humidification chamber and the humidification chamber comprising a float, the device comprising:

• an acquisition module, configured to acquire a float position image captured by a current camera;
• a processing module, configured to perform a grayscale processing on the float position image to obtain a current grayscale image data, wherein the current grayscale image data is a grayscale value of each unit height of the humidification chamber in a grayscale image corresponding to the float position image;
• a generation module, configured to generate a grayscale reference line and a grayscale image curve based on the current grayscale image data, wherein the grayscale image curve is a relationship curve between the current grayscale image data and a height value of the humidification chamber, and the grayscale reference line comprises a first sub-grayscale reference line, a second sub-grayscale reference line and a third sub-grayscale reference line;
• and
• a determination module, configured to perform a segmentation processing on the grayscale image curve by respectively using the first sub-grayscale reference line, the second sub-grayscale reference line, and the third sub-grayscale reference line as a segmentation reference line, to obtain a first number of segment, a second number of segment and a third number of segment, wherein the segmentation processing comprises:
• under each segmentation reference, dividing the grayscale image curve by the segmentation reference line, and counting number of segment located below the segmentation reference line;
• to determine an intersection point of each of the first sub-grayscale reference line, the second sub-grayscale reference line and the third sub-grayscale reference line with the grayscale image curve, and record the height value of the humidification chamber corresponding to each intersection point;
• and to determine a height value of the float from the height value of the humidification chamber corresponding to each intersection point according to the first number of segment, the second number of segment, and the third number of segment;
• the device further comprises:
• an extraction module, configured to determine current grayscale image parameters according to the current grayscale image data, wherein the current grayscale image parameters comprise a minimum value and an average value of the current grayscale image data;
• the generation module comprises:
• a selection unit, configured to select a first threshold, a second threshold and a third threshold from a numerical interval corresponding to the minimum value and the average value of the current grayscale image data;
• and
• a generation unit, configured to generate the first sub-grayscale reference line, the second sub-grayscale reference line and the third sub-grayscale reference line by respectively using the first threshold, the second threshold and the third threshold as a segmentation reference.