关键词: 能见度, 边缘, 梯度, 对比度, 亮度

Abstract: A new visibility auto-calculation method based on the edge of images is proposed.Firstly，the visibility definition of the atmospheric sciences is simplified.Then these inherent features for the landmark boundary region，such as gradient，contrast，brightness etc，are extracted and used to calculate visibility with the simplified definition.Finally，according to a preset threshold the visibility of landmark is quantitatively determined and visibility calculating is implemented.In this paper a system model for visibility auto-calculation is built，comparing the data between experiments and the actual observation，the feasibility and the effectiveness of the method is verified，in comparison with other methods，the method has improved significantly in the reliability and effectiveness for the calculation.

Key words: visibility, edge, gradient, contrast, brightness