  Illumination effects cause problems for many computer vision algorithms. We
present a user-friendly interactive system for robust illumination-invariant
image generation. Compared with the previous automated illumination-invariant
image derivation approaches, our system enables users to specify a particular
kind of illumination variation for removal. The derivation of
illumination-invariant image is guided by the user input. The input is a stroke
that defines an area covering a set of pixels whose intensities are influenced
predominately by the illumination variation. This additional flexibility
enhances the robustness for processing non-linearly rendered images and the
images of the scenes where their illumination variations are difficult to
estimate automatically. Finally, we present some evaluation results of our
method.
