Foreground Detection Robust Against Cast Shadows in Outdoor Daytime Environment

This paper proposes a novel foreground detection method which estimates the color changes in shadow regions by using a solar spectral model. In conventional method, since it is assumed that only brightness changes from background in shadow regions, shadow regions are extracted falsely as foreground in the case where color in the shadow region also changes in outdoor daytime environment. The proposed method estimates the color changes in shadow regions by calculating colors of direct and ambient illuminance which radiate to the captured scene using a solar spectral model. By estimating the color changes, the proposed method can robustly distinguish foreground and shadow regions in outdoor daytime environment. Experimental results demonstrate that the proposed method successfully estimates the changes of background color in shadow regions and improves F-measure of foreground detection compared with the conventional methods.