Distortion Correction Technology Of Upward Underwater Images

With the development of underwater technology,people put forward more requirements for underwater vision system.The submarine uses periscope to obtain sea surface state information,however,there are two disadvantages of the traditional submarine periscope.Firstly,when observing the target above the water surface,it must float to the position near the sea surface,rotate and extend periscope to observe the scene on the water surface or in the air,Because periscope is exposed to the surface of water,radar reflector will be produced,it is easy to expose the submarine's position.Secondly,when the submarine is in the process of floating or landing,before reaching out the periscope,it is usually impossible to perceive the existence of vessels,obstacles and other objects directly above the submarine,which will cause the submarine and its periscope to collide with the object above it and cause an accident.The development of a new underwater aerial imaging system,virtual periscope,is of great significance to the development of underwater vision system,compared with the traditional submarine periscope.The concealment and safety of virtual periscope make up for the defect of traditional periscope.But because of the sea waves,the camera to the water in the water,the image is not clear and distortion,aiming at the phenomenon of the attenuation characteristics of visual imaging in sea water,the optical properties of water firstly,establishes the theoretical model of light propagation in water,law of optical properties of water the effect on imaging quality of underwater,and for the construction of digital underwater optical image resolution enhancement model,improve water permeable to air quality of the image.And then take the appropriate means of reconstruction of the sea on the whole hemisphere in the underwater image,before the correction of image distortion free imaging,wave estimation wave estimation.As a typical In this paper,the inverse scattering problem of the model is studied,which is based on the calculation of wave surface scattering elements along the boundary of the Snell cone,obtains the wave surface height estimation satisfying the linearized wave surface dynamic equation,and simultaneously fits the optical path vector of the whole image sequence,and reconstructs the wave surface of the sea wave based on the reverse ray tracing.Finally,the simulation and experiment of each step of the proposed image correction method are carried out,and a prototype based on wave-front sensor is designed.The device can synchronously observe the wave surface information and the water target image and reconstruct the wave surface according to the position offset of the light passing through the hole.Finally,the agreement between simulation and experiment results proves the effectiveness of the proposed correction method.It also highlights the superior performance of new wave-front refraction imaging sensors in underwater imaging systems.