In the classical shape-from-shading model, surface luminance depends primarily on the unit surface normal. However, under diffuse lighting conditions, such as the sky on a cloudy day, luminance depends primarily on the amount of sky that is visible from each surface element, with surface normal of secondary importance. This claim is formalized in terms of a dominating sky principle and a surfac...

Weather forecasting is the process of predicting status atmosphere for certain regions or locations by utilizing recent technology. Thousands years ago, humans tried to foretell weather state in some civilizations studying science stars and astronomy. Realizing conditions has a direct impact on many fields, such as commercial, agricultural, airlines, etc. With development technology, especially...