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The task is:

Image shadow removal is an important topic in image processing. If you feel curious about it, you may take a look here, or just google for it image shadow removal

There are also a few questions on SE around it. For example:

However, I did not find any Mma implementations out there, and I don't want to reinvent the wheel if it is already rolling.

Does anybody know of some Mma codebase for using it as a starter?

Note: I have to do this for a few images, so I may go the manual way better than spend many hours in developing a full blown algorithm.