the marked signal is noticeable (e.g. digital on-screen graphics like a network logo, content bug, codes, opaque images). On videos and images, some are made transparent/translucent for convenience for consumers due to the fact that they block portion of the view; therefore degrading it.

This should not be confused with perceptual, that is, watermarking which uses the limitations of human perception to be imperceptible.

Capacity

The length of the embedded message determines two different main classes of digital watermarking

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