Lehn W H, Friesen W
Appl Opt. 1992 Mar 20;31(9):1267-73. doi: 10.1364/AO.31.001267.
A mirage is seen when atmospheric refraction distorts or displaces an image. We describe a mirage simulator that uses digital imaging equipment to generate mirage images from normal photographs. The simulation program relocates horizonal image lines into positions that they appear to occupy, according to rays traced from observer to object. Image-brightness adjustments are not required; we show that, while the atmosphere can change the size or shape of an object, it does not change its apparent brightness. The realistic quality of the computed images makes this simulator a useful tool in mirage analysis.
当大气折射使图像变形或移位时，就会出现海市蜃楼。我们描述了一种海市蜃楼模拟器，它使用数字成像设备从普通照片生成海市蜃楼图像。模拟程序根据从观察者到物体的光线追踪，将水平图像线重新定位到它们看起来占据的位置。不需要进行图像亮度调整；我们表明，虽然大气可以改变物体的大小或形状，但不会改变其表观亮度。计算图像的逼真质量使该模拟器成为海市蜃楼分析中的有用工具。
