Abstract:Aiming at the nonlinear distortion of the image caused by the multiinterface refraction of underwater imaging, this paper proposes a method for correcting underwater perspective projection images, which converts the underwater images taken by the camera through multiple interfaces into the perspective projection images of the camera in the air. First, under the multilayer plane refraction model, the imaging process of the underwater camera is modeled in the form of a fourdimensional light field parameterization, and the mapping relationship between the underwater image point and the corrected image point is calculated from the direction information of the light field. Then, using the mapping relationship between the two, the images acquired by the underwater camera are converted into perspective projection images in the air. After simulation and optimization, the average error of the perspective projection image with an object distance of 2 m to 4 m is within 1 pixel. The experimental results also show the reliability and accuracy of the method. When the object distance is 2 m, the average error of the corrected perspective projection image is 056 pixel, and the average error of row matching is 04 pixel.