Sharpening-Demosaicing Method Using Total-Variation Regularization

Abstract

We previously presented a demosaicing method that simultaneously removes image blurs caused byoptical low-pass filters used in digital color cameras with Bayer's-RGB color filter array.This sharpening-demosaicing method restores only spatial frequency components lower than the Nyquist frequency corresponding to the mosaicing pattern,but it often produces ringing artifacts near color edges.To overcome this problem,we added a new total-variation regularization-based super-resolution technique.We analyzed the effects of the added technique using the DFT method.We also created a false-color suppression method using the TV regularization.Simulation results show that the TV-regularization-based super-resolution technique effectively demosaics sharp color images while restoring sharp step-edges and without producing ringing artifacts near the edges.