After the brief introduction of existing dodging methods

the piecewise mean-variance adjustment is presented for both brightness and contrast homogenization.Then

the focus of the paper is put on the experimental comparison among the results obtained by the following five algorithms:MASK dodging

interpolation dodging

homomorphic filtering dodging

retinex dodging

and piecewise mean-variance adjustment.The experiments indicate that the piecewise mean-variance adjustment can deal with non-uniform brightness and contrast in an image.MASK dodging

interpolation dodging and retinex dodging can eliminate the phenomenon of non-uniform brightness.However

homomorphic filtering dodging can only weaken the phenomenon of non-uniform brightness.The dodging performance ranks piecewise mean-variance adjustment

MASK dodging

interpolation dodging

retinex dodging

and homomorphic filtering dodging from the best to the worst

respectively.