The Vision and Media Lab
Lighting Invariance
This work is concerned with the derivation of illumination-invariant, and hence shadow-free, image representations. We recover a full colour shadow-free image with the help of the invariant representation by first identifying shadow edges. Removing shadow edges from an edge-map of the original image by edge inpainting, we to re-integrate this thresholded edge map thus deriving the sought-after 3-d shadow-free representation.

Shadow Removal G. D. Finlayson, S. D. Hordley, C. Lu, and M. S. Drew. On the Removal of Shadows From Images. IEEE Transactions on Pattern Analysis and Machine Intelligence , 2006. [pdf]