00306nas a2200121   4500000000100000000000100001008004100002260001400043100001800057700001700075245008600092490000600178       2009                            d  cJan. 20091 aJing-Ming Guo1 aMing-Feng Wu00aImproved Block Truncation Coding Based on the Void-and-Cluster Dithering Approach0 v8