11 Facts About Digital watermarking

Since a digital copy of data is the same as the original, digital watermarking is a passive protection tool.

Term "Digital watermarking Watermark" was coined by Andrew Tirkel and Charles Osborne in December 1992.

Digital watermarking watermark is called "fragile" if it fails to be detectable after the slightest modification.

Digital watermarking watermark is called semi-fragile if it resists benign transformations, but fails detection after malignant transformations.

Digital watermarking watermark is called robust if it resists a designated class of transformations.

Digital watermarking watermark is called imperceptible if the original cover signal and the marked signal are perceptually indistinguishable.

Digital watermarking method is referred to as spread-spectrum if the marked signal is obtained by an additive modification.

Digital watermarking method is said to be of quantization type if the marked signal is obtained by quantization.

Digital watermarking method is referred to as amplitude modulation if the marked signal is embedded by additive modification which is similar to spread spectrum method, but is particularly embedded in the spatial domain.

Blythe and Fridrich have worked on SDC in 2004 for a digital camera that would use lossless watermarking to embed a biometric identifier together with a cryptographic hash.

Many Digital watermarking techniques have been proposed in the literature to address these purposes.