基於圖形處理器之即時熱影像模擬

GPU-based Real-Time Simulation of Thermogrphy

邱晟瑋(Cheng-Wei Chiu)

指導教授 ： 林奕成

國立交通大學/資訊學院/多媒體工程研究所/碩士(2010年)

https://doi.org/10.6842/NCTU.2010.00594

摘要

本論文針對熱式影像為目標，提出一套基於圖形處理器之即時熱影像模擬演算法。我們從熱力學定律中推導出的熱傳遞模型，藉而模擬真實的熱式影像。由於傳統的熱模擬注重精密的數值計算，模擬的過程往往花費了過多的時間。因此，我們建立了簡化後的熱傳遞模型，並使用有限元素法來描述物體的動態熱能，最後藉由圖形處理器的平行運算能力加速模擬流程，輸出即時擬真的熱影像。其中，我們以Phong反射模型為主模擬熱輻射的變化，並以較少的儲存空間計算均勻材質實心物體的熱傳導過程，以圓柱體受風力的熱對流影響簡化時寄物體的複雜邊界。最後，我們將比較實驗結果，分析出模擬過程中最合適的各項參數。

關鍵字

熱影像模擬 ； 光反射模型 ； 虛擬實境

並列摘要

The goal of this thesis is to propose an efficient framework for real-time thermography simulation. Since our purpose is not fully physical simulation but visually correct thermographic view, we propose a plausible illumination method for approximation of heat transfer where radiation, conduction and convection are all included. We use Phong illumination model to simulate radiation since indirect reflection can be ignored with low temperature difference. For simulation of conduction, we construct less 2D textures to substitute a large-sized volumetric 3D object to reduce computational complexity of heat propagation. To simulate convectional effect, we simplify the shapes of objects into cylindrical case and apply the formula of heat transfer from a cylinder in cross flow. All of these methods are able to be accelerated by GPU-based rendering which synthesizes realistic thermal images of a virtual environment in real-time.

並列關鍵字

thermal image ； illumination model ； virtual reality

參考文獻

[BJO98] E. Buyruk, M. W. Johnson and I. Owen, “Numerical and experimental study of flow and heat transfer around a tube in cross-flow at low Reynolds number”, International Journal of Heat and Fluid Flow, Vol. 19(3), Pages 223-232, June 1998.

[BWS99] G. Baciu, W. S. Wong and H. Sun, “RECODE: an Image-based Collision”, Journal of Visualization and Computer Animation, 10, 181–192, 1999.

[FKZQ*09] Z. Fan, Y. Kuo, Y. Zhao, F. Qiu and A. Kaufman, and W. Arcieri, “Visual simulation of thermal fluid dynamics in a pressurized water reactor”, Vis. Comput. 25, 11, Oct. 2009.

[GTGB84] Goral, C. M., Torrance, K. E., Greenberg, D. P. and Battaile, B., “Modeling the Interaction of Light between Diffuse Surfaces”, Computer Graphics, vol. 18, no. 3, pp 213-222, 1984.

[GRLM03] N. K. Govindaraju, S. Redon, M. C. Lin and D. Manocha , “CULLIDE: Interactive Collision Detection Between Complex Models in Large Environments using Graphics Hardware”, ACM SIGGRAPH/Eurographics Graphics Hardware, 2003.