本文選題：太陽活動(dòng) + 耀斑��； 參考：《中國科學(xué)院研究生院(空間科學(xué)與應(yīng)用研究中心)》2015年碩士論文

【摘要】：太陽活動(dòng)是太陽發(fā)射出的太陽輻射在總量上的變化,其組成具有周期性的變化特性,主要活動(dòng)形式有太陽黑子、光斑、譜斑、耀斑、日珥和日冕瞬變等。劇烈太陽活動(dòng)釋放出的高能太陽風(fēng)結(jié)構(gòu)可能會(huì)誘發(fā)極光、磁暴、電離層暴等,這將對(duì)通信、電力的安全運(yùn)行產(chǎn)生重大影響,也會(huì)對(duì)航天航空探索產(chǎn)生深遠(yuǎn)的影響。由于空間科學(xué)數(shù)據(jù)量巨大以及三維繪制的性能限制,近些年來對(duì)太陽活動(dòng)視景模擬的技術(shù)不足夠成熟,對(duì)其模擬的效果會(huì)出現(xiàn)各種各樣的問題,比如繪制速度慢、用戶交互性差、效果差,無法實(shí)現(xiàn)實(shí)時(shí)等。紋理在現(xiàn)實(shí)世界中普遍存在,是一種能夠表現(xiàn)物體表面特征的視覺現(xiàn)象。在計(jì)算機(jī)圖形圖像學(xué)、計(jì)算機(jī)視覺、虛擬現(xiàn)實(shí)等研究方向,紋理常用于顯示曲面幾何形狀。對(duì)于太陽表面的變化情況,可以用“紋理”來模擬。動(dòng)態(tài)紋理是一種基于紋理映射的表示方法,是用來描述某種具有時(shí)間相關(guān)重復(fù)特征的動(dòng)態(tài)景觀的圖像序列,比如隨風(fēng)而動(dòng)的旗幟、瀑布、麥浪、煙霧等。元胞自動(dòng)機(jī)是一種可以實(shí)現(xiàn)整體或局部隨時(shí)間推移變化的動(dòng)力學(xué)系統(tǒng),該系統(tǒng)中的元胞按照一定局部規(guī)則在離散的時(shí)間維上演化。本文把動(dòng)態(tài)紋理的合成技術(shù)應(yīng)用到太陽活動(dòng)的視景模擬方面。通過采用基于紋理塊的樣圖紋理合成方法建立太陽表面靜態(tài)紋理,實(shí)現(xiàn)太陽表面背景紋理的合成;通過把元胞自動(dòng)機(jī)的演化規(guī)則應(yīng)用到太陽活動(dòng)中的耀斑,對(duì)其耀斑的大小和亮度變化進(jìn)行仿真,最后在三維場(chǎng)景中實(shí)現(xiàn)整個(gè)演變過程。本文的創(chuàng)新點(diǎn)在于:1.將動(dòng)態(tài)紋理合成技術(shù)應(yīng)用到太陽活動(dòng)視景模擬方面;2.利用QTM算法解決球面紋理映射過程中的極點(diǎn)匯聚問題;3.將太陽活動(dòng)分為非活動(dòng)區(qū)域和耀斑區(qū)域,分別定義元胞自動(dòng)機(jī)的演化規(guī)則,應(yīng)用到耀斑的爆發(fā)和消失,以實(shí)現(xiàn)太陽表面的動(dòng)態(tài)演化;通過動(dòng)態(tài)紋理對(duì)太陽活動(dòng)進(jìn)行視景模擬,在保證視景模擬效果的前提下減少計(jì)算時(shí)間,實(shí)現(xiàn)了對(duì)太陽活動(dòng)的實(shí)時(shí)視景模擬。
[Abstract]:Solar activity is the change of the total amount of solar radiation emitted by the sun. Its composition has periodic variation characteristics. The main active forms are sunspot, spot, speckle, flare, prominence and coronal transient, etc. The structure of high-energy solar wind released by intense solar activity may induce aurora, magnetic storms, ionospheric storms, etc. This will have a significant impact on the safe operation of communication and power, and will also have a far-reaching impact on aerospace exploration. Because of the huge amount of space science data and the performance limitation of 3D rendering, in recent years, the technology of simulation of solar activity scene is not mature enough, and the simulation effect will appear various problems, such as slow rendering speed. The user interactivity is poor, the effect is bad, cannot realize the real-time and so on. Texture is ubiquitous in the real world, and it is a visual phenomenon that can represent the surface features of objects. In the fields of computer graphics, computer vision and virtual reality, textures are often used to display geometric shapes of surfaces. Changes in the surface of the sun can be simulated by "textures". Dynamic texture is a representation method based on texture mapping, which is used to describe the image sequence of a dynamic landscape with time-dependent repetition characteristics, such as flag moving with the wind, waterfall, wheat wave, smoke and so on. Cellular automata (CA) is a dynamic system which can realize global or local changes with time. The cellular in the system evolves in discrete time dimension according to certain local rules. In this paper, the dynamic texture synthesis technique is applied to the scene simulation of solar activity. The static texture of the solar surface is established by using texture block based texture synthesis method, and the background texture of the solar surface is synthesized, and the evolution rule of cellular automata is applied to the solar flare. The size and brightness of the flares are simulated, and the whole evolution process is realized in the 3D scene. The innovation of this paper lies in 1: 1. The dynamic texture synthesis technique is applied to the simulation of solar motion scene. QTM algorithm is used to solve the pole convergence problem in the process of spherical texture mapping. The solar activity is divided into inactive regions and flare regions, and the evolution rules of cellular automata are defined, which are applied to the eruption and disappearance of flare to realize the dynamic evolution of the solar surface, and the scene simulation of solar activity is carried out through dynamic texture. On the premise of guaranteeing the visual simulation effect, the calculation time is reduced, and the real-time scene simulation of solar activity is realized.
【學(xué)位授予單位】：中國科學(xué)院研究生院(空間科學(xué)與應(yīng)用研究中心)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P182.9;TP391.41

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