I. Linares Russell M. Mersereau Mark J. T. Smith Enhancement of Block Transform Coded Images Using Residual Spectra Adaptive Postfiltering. 321-330 1994 conf/dcc/1994 Data Compression Conference db/conf/dcc/dcc94.html#LinaresMS94 http://dx.doi.org/10.1109/DCC.1994.305940