The use of computer programming to extract sky brightness from digital images
Authors: Shahriar, Abu ; Hyde, Richard
The use of digital cameras to capture sky images for measuring sky brightness is an inexpensive and accurate method. However, a digital image has numerous pixels each containing colour data that is impossible to calculate into luminance values manually. Therefore, in this paper we describe the algorithm of a computer program that can automate the calculation process and simultaneously compare the measured sky luminance with ISO/CIE Standard Sky luminance, using diffuse horizontal illuminance, to determine the occurrence frequency.