基于红外物理学和流体动力学的海面船只红外尾迹真实感绘制  

Realistic Rendering of Infrared Ship Wake on the Sea Based on Infrared Physics and Hydrodynamics

作　　者：廖惟博 赵霄洋[2] 张繁[3] 郑尚达 王章野[1] Liao Weibo;Zhao Xiaoyang;Zhang Fan;Zheng Shangda;Wang Zhangye(State Key Lab of CAD&CG at Zhejiang University, Hangzhou 310058;Beijing Institute of Spacecraft System Engineering, Beijing 100094;College of Computer Science & Technology, Zhejiang University of Technology, Hangzhou 310023)

机构地区：[1]浙江大学CAD&CG国家重点实验室,杭州310058 [2]北京空间飞行器总体设计部,北京100094 [3]浙江工业大学计算机科学与技术学院,杭州310023

出　　处：《计算机辅助设计与图形学学报》2017年第7期1227-1234,共8页Journal of Computer-Aided Design & Computer Graphics

基　　金：国家"八六三"高技术研究发展计划(2015AA016404);国家自然科学基金(61272302;61303141)

摘　　要：随着红外热像仪成像分辨率的提高,已能观察越来越多新的目标红外成像特征.为探究航拍海面船只红外尾迹的形成原因和具体成像特征,基于流体动力学和红外物理学原理,提出一种海面船只红外尾迹建模与绘制新算法.首先使用体素化将船体转化为固体粒子,以实现固-液耦合效果模拟;然后提出一种海水垂直面的温度变化模型,以确定液体粒子的初始温度值分布;为模拟海上行驶船只的运动及其场景的红外成像特性变化,提出一种新的结合光滑粒子流体动力学(SPH)模型及海水热传导机制的模型;最后通过红外成像模型,成功绘制出海面船只的红外尾迹场景特征图像.文中所提出的海水热传导机制SPH模型除了能模拟船只尾迹的几何形状变化外,还能求得尾迹区域海水的红外物理特征变化,并从实验模拟的角度证明了红外尾迹的成像原因.该算法在海面目标的探测与救援、军事上的红外隐身与对抗等领域都有重要的应用价值.With the improvement of the imaging resolution of thermal infrared(IR)imager,more and morenew target infrared image synthesis has been observed.To explore the causes and specific image synthesis ofIR wake of sea ships from aerial images,we propose a novel modeling and rendering algorithm for IR wakeof sea ships based on fluid dynamics and infrared physics in this paper.Our algorithm first hires voxelizationto convert the ship body into solid particles for solid-liquid coupling simulation.Then,a vertical temperaturedistribution model of seawater is put forward to determine the initial temperature value distribution of fluidparticles.To simulate the motion and change of infrared synthesis of navigating sea ship scene,a new modelcombined with smoothed particle hydrodynamics(SPH)and seawater heat conduction mechanism is proposed.Finally,realistic infrared ship wake scenes are successfully rendered according the infrared imagesynthesis model.Our method can simulate not only the geometric change but also the IR physical feature change of the ship wake area.We thus prove the causes of IR ship wake image from the view of experimentalsimulation,which can be found potential applications in the domains such as target detection and rescueon sea surface,and the infrared stealth and countermeasure in the military affairs,etc.

关 键 词：自然景象模拟 海面船只红外尾迹仿真 真实感绘制 红外物理学 SPH热传导机制模型 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]