A brief description of what you implemented (including any bonus points)

I implemented Debevec's method to construct a HDR image.
The pixel sample is randomly chose. 
I use CImg and GSL libraries.
under src type make can make all executables (r_curv and hdr)
then run ./r_curv to get curves
and then run ./hdr to get final hdr image output

How each member of your group contributed
This is a one-man group