The Growth Simulation Of Shepherd's Purse Root System Based On VC ++ And OpenGL

Root system, the underground component of plant,is the important organs of fixing the body of plants to soil, absorbing, carrying and storing nourishing substances, and synthesizing a series of organic chemicals.The root architecture of plants, namely, the three-dimensional model and distribution of root systems in the growing medium, is crucial to the utilization of water and nutrition. Because of the invisibility and complexity of root systems condition, the ordinary biological experiments can not be done to get the three-dimensional geometrical parameters for the root architecture in-situ. Therefore.the quantitative research has ever been one of the difficulties on the root biology research. With the development of computer and instrument analysis technology, great progress has been made in the computer simulation of root architecture. In addition to investigate the patterns of root growth and structure analysis, the root architecture simulation system can also be used for quantitative analysis and showing the soil conditions for crop growth combined with the root growth model. An important function of the simulation system of root architecture is to get the visualization of the process of the roots growth in the soil, which can visually examine the growing conditions of roots in soil, and also enhance the convenience of research methods.Plant roots can be divided into tap root system and fibrous root system. As tap root system, shepherd's purse root system is the research object in this paper. Shepherd's purse native to China, and because of its high economic and nutritional value, it has become a kind of cultivated plants. As its growing cycle is short, which can be annual producted and supplied, it becomes a kind of promising green vegetables. For the research on the shepherd's purse is just limited to the overground parts, the main purpose in this paper is to use computer simulation to research the underground parts of shepherd's purse root system growth.This research work will have a certain academic value for the in-depth study of botany and cultivation law of shepherd's purse. This paper has been finished some works as follows:According the proposed experimental plan, and through the cultivation experiment, planting shepherd's purse in different degrees of soil compaction, observing and measuring the roots of shepherd's purse regularly, discussing the differences of the root architecture of shepherd's purse in the entire growing cycle under different soil compaction, getting features of configurations in the different soil compaction. As a result, we can find out the growing pattern of shepherd's purse roots system and get the appropriate degree of soil compaction for the growth of shepherd's purse.The RGB color model of the image is selected as the basis for image analysis. Through root samples by image processing test and comparison features of the R, G, B component distribution, we can see that the most obvious bimodal characteristic of the color image is the R component. Therefore, the Otsu automatic threshold segmentation algorithm is used to segment the R component of RGB image in this paper.To eliminate the noise impact, the morphological opening and closing operation processing are used on the segmentation images, and thus getting a more accurate shepherd's purse root system structure, and this provides the necessary root image which obtaining the shepherd's purse root architecture parameters such as corner points and angle. To detect the corner of shepherd's purse root architecture and measure the branching angle, using the Radon transform to operate the simple root system image which got by that image processing.And finally we can get root architecture parameters such as simple part of shepherd's purse root system corners and angles.According to geometric construction modeling method, the root architecture simulation model of shepherd's purse root system is investigated in this paper:axial tree is proposed to describe topology structure of shepherd's purse root system, and data structure of doubly linked list is designed to store its 3D geometric structure. Three-dimensional solid model finally can be developed with the growing features of shepherd's purse root system.Based on Microsoft operating systems WIN32 application integration development environment and the structural model SimRoot platform of pre-existing geometry, as object-oriented Visual C++as root architecture of shepherd's purse simulation programming language, combined with open graphics library OpenGL, using the dynamic tree data structure and recursive traversal methods, and according to cultivated experimental of shepherd's purse and root system image analysis data, we programme the three-dimensional visual simulation procedure of the shepherd's purse root system. After debugging, the three-dimensional solid image which can display the growing process of the shepherd's purse root system are got, and the computer simulation program output related to its root architecture parameters are received. By cultivating shepherd's purse under different soil compaction and comparing experimental data to simulated data, it is proved that the established computer simulation system can factually reproduce the growing process of shepherd's purse root system, and reflect its morphological characteristics and distribution more accurately. With the further analysis and comparison of experimental data of planting shepherd's purse under different degrees of soil compaction, the idea that suitable soil compaction for the growing of shepherd's purse is 1.0-1.2 g/cm3 is put forward in this paper, which provides a theoretical basis and research method for the shepherd's purse production, development of cultivation techniques and plant physiology research.The measurement, image processing, root architecture growing modeling and computer simulation method that all proposed in this paper are not only meaningful for reseaching the shepherd's purse, but also able to make some reference for the simulation of other plants especially the tap root system.