植物果实典型病害的计算机仿真.pdfVIP

ABSTRACT ABSTRACT AABBSSTTRRAACCTT Fruit disease is a common phenomenon during the growth of fruit, which seriously affects the production and value of fruits. Using computer simulation method, the above process can be modeled and reproduced quantitatively, which can replace the time-consuming, laborious and expensive fruit disease experiments. In addition, visualization of the changes in the three-dimensional fruit can increase the realism of the model, with wide applications in film and television making, computer games, etc. Although the simulation of many kinds of natural phenomena has been studied in the field of computer simulation and graphics, the reproduction of natural decay processes has not received much attention. Visual simulation methods not only focus on the changes of the external surface of fruits, but also account for the biological principles of fruit deterioration, making the simulation more accurate. Our research mainly focuses on visualization offungal diseases and physiological diseases. Fruit ring rot is the representative of fungal diseases, and sunscald is the representative of physiological diseases. We mainly study the disease process simulation method, and design the method combining the macroscopic and microscopicsimulationmethodbased onphysiologicalcharacteristics. This thesis proposes a new method to simulate ring rot which is the representative of fungal disease. The most obvious external symptoms of ring rot are the typical shades of white on the fruit surface. By simulating the propagation and growth of bacteria microcosmically, we obtain the colony morphology which is the final appearance of fruit symptom. In order to simulate the process of fruit ring rot, an improved reaction diffusion model was adopted to model the colony formation. This model can simulate the growth and movement of fruit ring rot