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This letter introduces color constancy and Retinex theory for image enhancement.It clas- sifies Retinex algorithms into four categories and provides their principles and implementations in general.The experimental results of Frankle-McCann,MSR (Multi-Scale Retinex) and PNSD (Pro- jected Normalized Steepest Descent) Retinex algorithms are presented and compared.Moreover, variance and average gradient are proposed to evaluate the performance of the different algorithms.
This letter introduces color constancy and Retinex theory for image enhancement. It clasifies that the Retinex algorithms into four categories and provides their principles and implementations in general. The experimental results of Frankle-McCann, MSR (Multi-Scale Retinex) and PNSD (Pro- jected Normalized Steepest Descent) Retinex algorithms are presented and compared. More over, variance and average gradient are are to evaluate the performance of the different algorithms.