Title image digital watermarking based on discrete cosine transform
Shumei Wang, Weidong Zhao · Jisuanji gongcheng yu sheji · 2007
In recent years,there are much bigger development in the digital watermarking technology,which become research hot spot of the present watermark area of technology based on transformation territory watermark technology because of better robustness and the security.The discrete cosine transform(DCT)which is used in present image watermarking technology area mainly is summarized de- crypted and analyzed,and algorithms are carried on the classified comparison,what is more,the discussion is carried on the value of the scaling parameteras well as its influence on the image.Further,some efficient watermarking schemes are presented,whose robu- stness is discussed.The most important stages of a watermarking algorithm namely watermark embedding are described.