Three-dimensional Reconstruction Of Plant Main Organs And Its System Realization

The virtual plant 3D model can be used not only in cultural life such as film and television production,game scene construction,but also in scientific fields such as botany and agronomy.As an important part of plants,plant organs are also an important part of reconstructing virtual plant models.In the current method of modeling plant organs,the modeling method for the blade gradually begins with the transition from the external features to the mechanism of plant development.In recent years,a more effective method,using the L system to simulate the morphogenesis mechanism of plant leaves,can generate a variety of plant leaves by changing the parameters.However,due to the complexity of the mechanism of leaf morphogenesis,this method can only obtain a two-dimensional blade model.In the modeling method of plant block plant organs,due to the complicated growth process,the point cloud-based modeling method is still the main method.Compared with image cloud,laser and other point cloud acquisition methods,Kinect provides a point cloud acquisition path with moderate cost and relatively high precision.However,Kinect is currently used for the reconstruction process of objects with obvious morphological features.However,there are relatively few researches on the modeling methods of the single-object shape of plant block organs,and the existing methods are less automated.This paper uses computer graphics and machine vision related knowledge to study the three-dimensional morphological plant leaf modeling method based on L system,and the plant block cloud point modeling method based on Kinect V2 RGB-D data.In addition,a set of design and implementation is designed.Plant block organ point cloud modeling system.The main work of this paper is as follows:1.A method for generating a three-dimensional shape leaf model is proposed.This method is aimed at the problem that the blade morphogenesis method proposed by Runions A et al.can only generate the model of the two-dimensional morphological blade,and improves the method of generating the vein,the blade edge and the leaf surface respectively.Firstly,the anisotropy problem of the vein growth direction in three-dimensional space is solved by taking the vein shape function as input to obtain the vein structure with three-dimensional shape.Then,the three-dimensional blade edge is generated by the relationship between the blade edge and the vein,and the three-dimensional blade structure skeleton is obtained.Then,by sampling and splitting,the foliar grid is constructed,and finally the three-dimensional shape leaf model is obtained.Five groups of comparative experiments show that a variety of three-dimensional plant leaf models similar to real plant leaf morphology can be generated by this method.2.A point cloud modeling process based on Kinect V2 RGB-D data for plant block organs was proposed.In the filtering stage of the process,an improved neighborhood image filling depth image filtering method is proposed.In the initial registration stage of point cloud,the initial registration method of point cloud based on high resolution image and the mismatching point pair elimination method based on the slope relationship between matching points are proposed.After that,the comparison experiments of filtering methods,comparison experiments of multiple sets of high-resolution image registration methods,and comparison experiments of mismatch matching methods were carried out respectively,and the effectiveness of the proposed method was demonstrated.Finally,the validity of the modeling process proposed in this paper is verified by constructing a three-dimensional point cloud model of sweet potato.3.Based on the above research content,this paper calculates and implements a plant main organ modeling system.The system provides modeling process control and feedback functions based on a graphical user interface(GUI).The bottom layer uses widely used C++ libraries such as Qt,Open CV,and PCL as technical support.Ensure the ease of use and stability of the system.In summary,this paper studies the modeling methods of plant leaves and block organs separately,proposes improved methods for existing problems and constructs corresponding systems.It provides a reference for the research and application of plant organ modeling methods,and has certain academic significance.