A Study on Digital Watermarking Technology Based on Human Visual System
Sun Hong-lin · Modern Electronics Technique · 2006
The digital watermark technology hides the watermark signal in digital image,sound,documents,books,video frequency products and so on.Now the comparatively typical digital watermark method of image and video frequency is using the spatial frequency characteristic of the human vision system(HVS) to comprising the watermark′s perceptual transparency and robustness,using the HVS′ correlative characteristic,we may construct the digital watermark′s theory frame,thus produce the corresponding definition,namely making use of watermark′s embedding algorithm E,we may make the watermark W which derives from watermark′s generation algorithm embed into the multimedia data X,then guarantee no quality reduction of X,namely guarantee watermark data X_w possessing perceptual comparability with raw data X.Furthermore,using extraction algorithm D,we can extract watermark W~* which meets with the equivalence of W~* and W from X_w.