Jung-Soo Lee Whoi-Yul Kim A New Object-Based Image Watermarking Robust to Geometrical Attacks. 58-64 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3332&spage=58 2004 conf/pcm/2004-2 PCM (2) db/conf/pcm/pcm2004-2.html#LeeK04b