Narges Ahmidi Reza Safabakhsh A Novel DCT-based Approach for Secure Color Image Watermarking. 709-713 2004 conf/itcc/2004-2 ITCC (2) http://csdl.computer.org/comp/proceedings/itcc/2004/2108/02/210820709abs.htm db/conf/itcc/itcc2004-2.html#AhmidiS04