Hsiang-Cheh Huang Ting-Wei Chen Feng-Cheng Chang Adjacent Quad Modification Algorithm for Reversible Data Hiding. 171-174 2010 IIH-MSP http://doi.ieeecomputersociety.org/10.1109/IIHMSP.2010.50 conf/iih-msp/2010 db/conf/iih-msp/iih-msp2010.html#HuangCC10