Trunk Surface Topography Based On Uniform B-spline Research On 3D Reconstruction Technology

The 3D laser scanning measurement system has a special technology and high quality.It can continuously expand from a single point measurement to the surface measurement,and can obtain the stereo data of the object in time,creating the technical direction of the measurement category.The biggest disadvantage of the traditional stereoscopic imaging method is that image data cannot be acquired at the line of sight depth,and 3D laser scanning technology makes up for this deficiency.In this paper,3D laser scanning technology is used to reconstruct the surface morphology of tree trunks,which can be used to further accurately calculate the diameter,volume and growth parameters of trees,as well as the depth and variation of tree texture,knots and wormholes.It is of great significance to study the changes in the growth status of standing trees due to seasonal factors and the monitoring and evaluation of the health status of famous trees.The 3D laser scanning system is a popular research in the field of current surveying and mapping,and is widely used.In order to realize the 360° laser synchronous scanning around the trunk,the three-dimensional reconstruction of the trunk surface topography is carried out under the condition of minimizing the error and improving the measurement precision.A portable three-dimensional laser scanning device is designed and assembled,which can scan the omnidirectional Measure the surface topography of the trunk.The device is mainly based on the mechanical principle,electrical principle and the like,and is designed by a scanning platform,a translation lifting platform(translating lifting platform including a lifting mechanism and a base portion)and a central control device three-part laser scanner hardware system.On the translational lifting platform of the scanning device,a 2080Gocator3D intelligent sensor is placed in each of the three equally spaced circumferential positions to enable the three-dimensional laser scanner to achieve 360 full coverage synchronous scanning.In this study,the three-parameter independent intelligent laser scanner was mechanically calibrated by the seven-parameter method,and the three-dimensional point cloud data of the surface morphology of the scanned trunk was collected to realize the three-dimensional reconstruction of the surface morphology of the trunk.In this study,the three-dimensional uniform B-spline algorithm improved by node interpolation is used to realize the three-dimensional reconstruction of the trunk surface topography,and a more accurate three-dimensional reconstruction image is obtained.Compared with the three-dimensional reconstruction image of the trunk surface topography before interpolation,the interpolated three-dimensional reconstruction image of the trunk surface morphology is smoother,and can more accurately reflect the surface morphology of the knot surface and texture of the trunk surface.feature.This study provides a corresponding technical reference for further research and establishment of three-dimensional digital archives of trees.