Xiaochen Bo Lincheng Shen Wensen Chang Evaluation of the Image Degradation for a Typical Watermarking Algorithm in the Block-DCT Domain. 52-61 2001 conf/icics/2001 ICICS http://link.springer.de/link/service/series/0558/bibs/2229/22290052.htm db/conf/icics/icics2001.html#BoSC01