my shadow removal results

for now results aren't perfect, but i want to improve shadow removal in the future. In my program a few methods were implemented.

1 and 2-nd result (column 2 and 3)- simple algorithms explained in [1] (+ open source code).
3-d and 4-th - I have implemented based on [2] and [3].

Links:

1. http://www.inf.u-szeged.hu/projectdirs/ssip2011/teamF/index.html
2. http://www.ijcsi.org/papers/IJCSI-10-4-2-270-273.pdf
3. https://infoscience.epfl.ch/record/111781/files/piecewise_shadows.pdf

My publication ru (page 738) - http://www.enu.kz/downloads/materials/nauka2016.pdf