Synthesis of infrared ground target and its background

We establish an IR model for ground target such as tank considering the effect of inner heat source, friction and various environmental factors and draw IR images of target at various states using the techniques of Computer Graphics. We then propose a thermal model for different grounds using 1D finite difference method to calculate the surface temperature changing with time. The result are quite satisfied compared with the measured values. Also the re- distributing of temperature field after the touch between targets and ground is calculated and the realistic IR synthesis images of targets and the ground background are drawn. Finally by using the methods of 3D finite difference, we successfully calculate and render RI shadow which describes the effect of higher temperature distribution of the center area originally occupied by targets than that of the around area after the targets are driven away. We also draw different IR images of the ground at the different intervals after the targets have been driven away. Based on these IR images, we can determine the existence of the IR targets some certain interval ago.