Since daylight is natural light which consists of light from the sun and that from the sky, it varies according to the altitude of the sun and the meteorological condition. So, it is very difficult to carry out the daylighting design by using absolute value of daylight illuminance. Therefore, in the field of daylighting design, the configuration factor is widely used as an index of brightness because it is not affected by variation of illuminance.
So far, researchers, in order to obtain the configuration factor, have devised various methods on the optical photographic photometry such as a globoscope and a camera with a fish-eye lens. By the above methods, however, the configuration factor is obtained only through laying an equi-configuration factor diagram on a picture and counting the parts produced by the meshes. Those methods involve troubelsome work.
Therefore, the authors have developed a method to calculate the configuration factor by a personal computer system using pictures taken by an instantaneous camera. By this calculation method, the configuration factor on any point in the room is obtained by using several pictures taken by the instantaneous camera.
As an example, the configuration factor of the hall where the multilateral daylighting is used is calculated. Futhermore, the authors obtain the iso-configuration factor curves by the computer graphics.
Besides, by this method, the configuration factor is obtained more simply in a shorter time. This paper deals with this calculation method.
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