In real outdoor scenes, objects distant from the observer suffer from a natural effect called aerial perspective that fades the colors of the objects and blends them to the environmental light color. The aerial perspective can be modeled using a physics-based approach; however, handling with the changing and unpredictable environmental illumination as well as the weather conditions of real scenes is challenging in terms of visual coherence and computational cost. In those cases, even state-of-the-art models fail to generate realistic synthesized aerial perspective effects. To overcome this limitation, we propose a real-time, turbidity-based, full-spectrum aerial perspective rendering approach. First, we estimate the atmospheric turbidity by matching luminance distributions of a captured sky image to sky models. The obtained turbidity is then employed for aerial perspective rendering using an improved scattering model. We performed a set of experiments to evaluate the scattering model and the aerial perspective model. We also provide a framework for real-time aerial perspective rendering. The results confirm that the proposed approach synthesizes realistic aerial perspective effects with low computational cost, outperforming state-of-the-art aerial perspective rendering methods for real scenes.

中文翻译：

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基于浊度估计的空中透视效果实时渲染

在真实的室外场景中，远离观察者的物体会遭受一种称为空中透视的自然效应，该效应会淡化物体的颜色并将其融合为环境光的颜色。可以使用基于物理学的方法对空中视角进行建模；但是，在视觉连贯性和计算成本方面，应对变化多端且不可预测的环境照明以及真实场景的天气条件具有挑战性。在这些情况下，即使是最先进的模型也无法生成逼真的合成空中透视效果。为了克服此限制，我们提出了一种基于浊度的实时全光谱空中透视渲染方法。首先，我们通过将捕获的天空图像的亮度分布与天空模型进行匹配来估算大气浊度。然后，使用改进的散射模型将获得的浊度用于空中透视图渲染。我们进行了一组实验，以评估散射模型和空中透视模型。我们还提供了实时空中透视渲染的框架。结果证实，该方法以较低的计算成本综合了逼真的空中透视效果，优于用于真实场景的最新空中透视渲染方法。