improve pohe code
improve pohe code
improve pohe code
add FBF function
Merge pull request #13 from JieCyun/master

add three contrast enhancement methods
modify pohe code
Update README.md
Update README.md
Update README.md
improve pohe and fbf

speed up the pohe and fbf and integrate them with the opencv's integral
function
add two-pass connected-component labeling function
update libs for vc10
Update README.md
add halftone functions
improve twoPass()
Merge pull request #15 from b9707137/master

improve twoPass()
merge with upstream
remove descriptions of halftoning methods
modify halftoning functions
add pixkit::Timer