Title:
On-the-Removal-of-Shadows-From-Images
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Description: This paper is concerned with the derivation of a progression
of shadow-free image representations. First we show that
adopting certain assumptions about lights and cameras leads to a
1-d, grey-scale image representation which is illuminant invariant
at each image pixel. We show that as a consequence, images
represented in this form are shadow-free. We then extend this 1-d
representation to an equivalent 2-d, chromaticity representation.
We show that in this 2-d representation, it is possible to re-light
all the image pixels in the same way, effectively deriving a 2-d
image representation which is additionally shadow-free. Finally,
we show how to recover a 3-d, full colour shadow-free image
representation by first (with the help of the 2-d representation)
identifying shadow edges. We then remove shadow edges from
the edge-map of the original image by edge in-painting, and we
propose a method to re-integrate this thresholded edge map, thus
deriving the sought-after 3-d shadow-free image.
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On the Removal of Shadows From Images.pdf
