Cast Shadow Removal Using Time and Exposure Varying Images

Shadows are the natural accomplice of objects. As such, they have affected various algorithms dealing with image segmentation, object tracking and recognition. A lot of research has been focused on removing shadows from images while preserving the information available in the shadow region. In this paper, we present a simple yet robust algorithm for cast shadow removal utilizing images taken at different times with different exposures. While different exposures allow good recovery of shadow regions, the time-varying feature is used to suppress the shadow edges.