Method and device for measuring water level of cross section of open channel based on binocular vision

The invention discloses an open channel section water level measuring method and device based on binocular vision. The device comprises a buoy, a fixing device and a binocular camera. The buoy floats on the water surface of the section to be measured; the buoy comprises a floating disc, the upper surface wall of the floating disc is fixedly connected with a limiting column, and the axis of the limiting column is in the vertical direction; the upper surface wall of the floating disc is fixedly connected with a reflective rectangular frame sticker used for reflecting light, and the axis of the reflective rectangular frame sticker coincides with the axis of the floating disc. The limiting column penetrates through the fixing device in the vertical direction, and the buoy can only move relative to the fixing device in the vertical direction. The binocular camera comprises a connecting frame and two cameras, the two cameras are located on the same horizontal plane, and the connecting line of the optical centers of