天空亮度分布是建筑采光设计及节能分析的重要技术依据。国际照明委员会(CIE)给出了天空亮度的计算方法。这一方法首先要确定实际天空类型,而确定天空类型需要采用全数字亮度计,或者通过计算天空指数值的方法。本文提出一种应用手机摄像头拍摄天空图像,利用亮度方程和散射函数计算天空亮度值,应用最小方差准则,确定基于CIE一般天空标准的实际天空类型,为进一步天空亮度计算提供数据支持。 The sky brightness distribution is an important technical basis for lighting design and energy saving analysis of buildings. The International Commission on Illumination (CIE) gives a calculation of the sky’s brightness. This method first determines the actual sky type, and determining the sky type requires the use of an all-digital light meter or a method of calculating sky index values. In this paper, we propose a method to capture the sky image by using a mobile phone camera, calculate the sky brightness value by using the brightness equation and the scattering function, and apply the minimum variance criterion to determine the actual sky type based on the CIE general sky standard to provide data support for further sky brightness calculation.