Study Of Underwater Multi-channel True Color3D Reconstruction

Underwater imaging is an important way of ocean exploration. In recent years, withthe rapid development of photoelectric imaging and3D measurement technology, thetraditional underwater imaging has trended to underwater3D imaging. As countries valuethe marine resources and marine exploration, underwater3D reconstruction has beenbecoming a hot issue in the field of ocean exploration.Structured light scanning method is a common method for underwater3Dreconstruction with high resolution. Usually using a laser line as an active light source, itcan reduce the effect of underwater scattering and has a long detection distance. But thecommon laser line scanning method can not acquire the color information by using a singlelaser line.This paper presents a multi-channel laser line scanning method for true-colorthree-dimensional reconstruction of underwater targets. The underwater multi-channel truecolor three-dimensional scanning experiment system has been established by using RGBthree lasers as active light source and CCD as image sensor. The experiment results showthat the targets can be true color3D reconstructed with high resolution by this method.Based on the three-dimensional reconstruction of structured light scanning, this paperpresents a new three-dimensional reconstruction algorithm of searching closest calibrationpoints. This algorithm can be used to establish the coordinate mapping between the2Dscanning image and3D real world, and can be used to calculate the3D coordinates. It is asimple and effective algorithm for3D reconstruction.For underwater true color restoration, this paper proposes a calibration method forthree primary color by fitting photosensitive curve. On the basis of three primary colorscorrection method, this paper further proposes a method for attenuation coefficient measurement and methods for attenuation compensation.Serial experiments have been carried out to demonstrate the proposed methods ofunderwater true color3D reconstruction. The objects and scenes can be3D reconstructedwith millimeter scales and true color texture. In the experiments, the underwaterattenuation coefficient had been measured and the color of underwater image had beencompensated.The underwater true color3D reconstruction method proposed by this paper, can beused for underwater terrain and environment detection, topographic mapping, target3Dreconstruction, resource exploration and so on. It has some application potential andapplication value.