Diurnal Variation of Some Statistical Estimators with Time

Abstract

The variation in sky luminance caused by weather, season and time of the day are difficult to codify. To meet this, a tilted system facing the equator has been optically designed for studying the diurnal variation of some statistical estimators with time. These estimators are; contrast based on statistical properties (Ct), Mickelson contrast (CM) and Signal to Noise Ratio (SNR). The analysis process has been performed for two selected lines upon the captured images for the scene inside the optical system; one passes through homogeneous white region and the other line passes through different color regions. According to line's position and among the different used estimators, one can noticed the enhancement behavior to the distortion effect in the case of line that passes through homogeneous white region for SNR relationship with time. Besides, there is no effect can be seen in the case of that passes through different color regions.