Research On Three-dimensional Reconstruction And Dynamic Simulation Of Double Flower Plants

The visualization of plants is an important part in forestry informationization as well as an essential topic in the digital forestry practice.The dynamic visualization and digital display of virtual plants also have great practical significance for building intelligent forestry,promoting ecological culture and disseminating forestry knowledge in the new era.With the rapid development of information technology such as simulation,deep learning,graphic processing and 3D scanning technology,the virtual simulation of plants has become a powerful tool for exploring the discipline and verification hypotheses of biological systems.Virtual plants are reconstructed from structure to form,the relevant research of simulation is becoming more and more comprehensive.However,there are only few research about the virtual simulation research of ornamental flower plants.Due to the variety diversity and morphological complexity of ornamental flower plants,there are still problems for visual simulation of them.Especially the complex and dense double-flowered plants make more difficulty in simulation.To realize the structural simulation and dynamic simulation of double-flowered plants and to expand the application breadth and dimension of the reconstruction model,is the main issue of the paper.Therefore,this paper put forward feasible methods for 3D reconstruction and morphological simulation based on point cloud data.The key issues of flower point cloud data preprocessing,3D reconstruction and dynamic simulation are deeply studied.The main research contents are as follows:1.Double-flowered plant is taken as the research object.The overall 3D reconstructing and dynamic simulation framework(DMSDA-PLANT)based on point cloud data is suggested,to study the method of extracting the growth data of plant scientifically and comprehensively.As a result,the DMSDA-PLANT framework is confirmed,which include the process of data acquisition,extraction,transformation,reconstruction and application.The framework is available to maximize the effectiveness of data collecting and the range of usage,as well as minimize the damage to real plant.It has important practical significance especially for the digital protection of rare flower plants.It is also an exploration of forestry informatization theory research.2.The complex structure and petals occlusion in double flowered plant is highly possible to cause point cloud reconstruction difficulty of double-petal flowers.To solve the problem,a series of effective collection methods,such as differential positioning,curve node customization,marker registration and stitching,classified hole repairing,multi-quantification sample collection,as well as technical optimization strategy of point cloud data pretreatment,are suggested in the paper.The obtained point cloud data based on stage sample structure.The scientific and comprehensive three-dimensional point cloud data of flowers provide powerful data support for the next stage of realistic reproduction and dynamic simulation of flower structure3.According to the structure data tracked by flower growth process,the extraction and fitting method of petal growth curve based on point cloud data is proposed.Firstly,after the analysis of the topological structure of the double-flowered plants,the MeshLab local feature surface extraction method is proposed,to generate the data of the five growth stages of a sample petal.Secondly,the polynomial fitting is performed on the data,and the point cloud petal growth function formula is completed and passed into the FFD deformation algorithm to introduce the fitted growth function formula into the operation.Thirdly,the virtual flower model of Chinese rose with high similarity and scientific character is constructed by using realistic rendering technology,which realizes the application transformation of double-flowered rose from data model to animation model.4.Based on the reconstruction model for development and usage,to verify the feasibility of the DMSDA-PLANT framework,two systems with different interaction forms based on the reconstruction model are suggested,of which have different environments and different target users.One is the AR mobile application "Beauty at the fingertips",which is based on augmented reality(AR)and interaction technology.It is developed by Unity 3D,the framework and interactive technology is provided by Vuforia SDK.The other one is based on visualization and Interactive Realization of Holographic Images,in which various functional modules based on reconstruction mode and realization of 270 Degree Holographic Display and Interaction with XML Files are mainly adopted in developing the cabinet display system "Flower Portrait".The application and development of different technologies for the three-dimensional reconstruction of Chinese Rose model not only meets users’ multi-level ornamental needs and interactive experience,but also maximizes the realization of all-round and multi-dimensional visual expression of virtual flowers and plants.