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Xixian Xiong

at BeiHang Univ

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Proceedings Article | 11 September 2013 Paper

IR characteristic simulation of city scenes based on radiosity model

Xixian Xiong, Fugen Zhou, Xiangzhi Bai, Xiyu Yu

Proceedings Volume 8907, 890727 (2013) https://doi.org/10.1117/12.2032935

KEYWORDS: Infrared imaging, Thermography, Infrared radiation, Radiation effects, Solar radiation models, 3D modeling, Scene simulation, Thermal modeling, Infrared signatures, Solar radiation

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Reliable modeling for thermal infrared (IR) signatures of real-world city scenes is required for signature management of civil and military platforms. Traditional modeling methods generally assume that scene objects are individual entities during the physical processes occurring in infrared range. However, in reality, the physical scene involves convective and conductive interactions between objects as well as the radiations interactions between objects. A method based on radiosity model describes these complex effects. It has been developed to enable an accurate simulation for the radiance distribution of the city scenes. Firstly, the physical processes affecting the IR characteristic of city scenes were described. Secondly, heat balance equations were formed on the basis of combining the atmospheric conditions, shadow maps and the geometry of scene. Finally, finite difference method was used to calculate the kinetic temperature of object surface. A radiosity model was introduced to describe the scattering effect of radiation between surface elements in the scene. By the synthesis of objects radiance distribution in infrared range, we could obtain the IR characteristic of scene. Real infrared images and model predictions were shown and compared. The results demonstrate that this method can realistically simulate the IR characteristic of city scenes. It effectively displays the infrared shadow effects and the radiation interactions between objects in city scenes.

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