本文提出了一种基于桥梁热能传输的红外图像合成模型，用于生成不同时间点的桥梁红外图像。模型考虑了气象、环境、材料和人为因素，并利用热传递原理建立能量平衡方程，采用有限差分法求解。通过LOWTRAN模型加入大气效应，预计算并存储衰减值。此外，还预先生成红外纹理和深度衰减图像。模拟结果显示模型稳健可行。
Paper Abstract
Recently infrared signature simulation has been in a state of great interest. Although various models have been developed to generate synthetic image of infrared scenes, little work has been done to create high fidelity infrared image of bridge. In this paper a realistic model for infrared image synthesis of bridge based on its thermal energy transmission is proposed to generate the infrared image of bridge at different time. Our new IR image synthesis model of bridge accounts for meteorological, environmental, material and artificial factors. Then an energy equilibrium equation is built based on the principle of heat transfer and infrared physics. And a finite difference method is adopted to solve the equations. Finally we get the radiance distribution of target surface. To get high fidelity, the effect of atmosphere is added using LOWTRAN model. The value of attenuation is pre-computed and stored in our database. We also pre-generate infrared texture and depth attenuated image from visible image. Infrared images of bridge from different viewpoints at different time can be rendered. Our results of simulation show that the model is robust and feasible.
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