Nonlinear preprocessing scheme for JPEG-based image coding
Ruikang Yang, Moncef Gabbouj, Yrjo A. Neuvo · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1994
In this paper, we propose to use a class of nonlinear filters, called weighted median filters, as preprocessors to JPEG-based image coding. A theory to design weighted median filters which maximally smooth the image subject to a set of important image details is presented. An efficient algorithm is provided and simulations are given to demonstrate the performance of these preprocessors.