Digital Watermarking
Learn about this key ingredient to copyright protection.
TABLE OF CONTENTS Digital Watermarking
Glossary
- 2AFC
-
See Two Alternative, Forced Choice .
Numbers
- Absolute threshold (of hearing)
- The minimum audible intensity of a pure tone in a noiseless environment.
- Active attack
- Any attempt to thwart the purpose of a watermarking system by modifying content. This includes unauthorized removal (or removal attacks) and unauthorized embedding (or forgery attacks).
- Added pattern
- The sample-by-sample difference between an original and a watermarked version of a Work (i.e., the pattern added to a Work to embed a watermark).
- Added vector/mark
- The difference between a marking-space vector extracted from a watermarked version of a Work and one extracted from the original version of that Work. This is analogous to an added pattern, which is the corresponding vector in media space.
- Additive noise
- A random signal, independent of a Work, that is added to the Work.
- Additive noise channel
- A communications channel in which the transmitted signal is corrupted by additive noise before reaching the receiver.
- Adversary
- Anyone who attempts to thwart the purpose of a watermarking system. Depending on the application, adversaries might attempt a variety of attacks, including unauthorized removal, unauthorized detection, and unauthorized embedding. Other terms from the literature that have been used for an adversary include pirate, hacker, attacker, and traitor.
- Alphabet
- A set of symbols, sequences of which can be used to represent messages.
- Aspect ratio
- The ratio of width to height of an image or video frame. This ratio is sometimes presented...
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