Maximum-likelihood parameter estimation for image ringing-artifact removal
Seungjoon Yang, Yu Hen Hu, Thanh-Trung Nguyen, Damon L. Tull · IEEE Transactions on Circuits and Systems for Video Technology · 2001
At low bit rates, image compression codecs based on overlapping transforms introduce spurious oscillations known as ringing artifacts in the vicinity of major edges. Unlike previous works, we present a maximum-likelihood approach to the ringing-artifact removal problem. Our approach employs a parameter estimation method based on the k-means algorithm with the number of clusters determined by a cluster-separation measure. The proposed algorithm and its simplified approximation are applied to JPEG2000 compressed images. Our results show effective and efficient removal of ringing artifacts.