Control and evaluation of room interior lighting using digital camera as the sensor

Abstract

This paper reports the results of measurements performed in a test room to test how digital camera can be used as luminance meter and thus to investigate the lighting control scheme based on the inputs coming from camera. An indoor lighting control scheme which adapts according to the daylight availability is presented in this work. The camera calibration procedure based on High Dynamic Range Imaging technique is used to obtain the camera response function which allows to relate pixel values obtained from the image and the photopic luminance values. Luminance gradient evaluation for the uniformity analysis is discussed for the test room.

A state-of-the-art artificial intelligent techniques in daylighting controller: models and performance

“…Since the luminance value matching the pixel value obtained from the image and scene luminance is not identical, it is critical to calibrate the camera to derive absolute luminance for general lighting applications (Varghese et al, 2018;Sudheer Kumar et al, 2015). Raw HDR images can be calibrated by: (i) Photometric calibration with a Calibration Factor (CF) and (ii) vignetting correction (Cai and Chung, 2011).…”