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Some watermarks can be inserted in a way that they are imperceptible to a viewer. A robust watermark can be difficult to detect and remove, but the removal of invisible watermarks is a significant weakness. Since watermarks must be inserted into the video, they only identify copies of the particular video made after that point in time.
The Wombles is a stop-motion animated British television series made in 1973–1975. The Wombles are creatures that live underground, collecting and recycling human rubbish. [3]
Yellow dots on white paper, produced by color laser printer (enlarged, dot diameter about 0.1 mm) Printer tracking dots, also known as printer steganography, DocuColor tracking dots, yellow dots, secret dots, or a machine identification code (MIC), is a digital watermark which many color laser printers and photocopiers produce on every printed page that identifies the specific device that was ...
For the most part, adult human beings rarely take notice of them, or fail to distinguish them from humans. In the film Wombling Free this is reversed as the Wombles seek to get humans to listen to their pleas to "make good use of bad rubbish". Wombles generally have a low opinion of other animal species, though they are never unkind to them.
Watermarks present an issue when archival videos are used for a documentary that strives to create a coherent story. In some cases, watermarks are blurred or digitally removed if possible to clean up the picture. In the absence of visually perceptible watermarks content control can be ensured with visually imperceptible digital watermarks. [2]
The Wombles is an animated series for children transmitted in 1997 and 1998, based on the 1973 series created by Elisabeth Beresford. The Wombles had remained popular with children into the 1980s. [1]
A digital watermark is called semi-fragile if it resists benign transformations, but fails detection after malignant transformations. Semi-fragile watermarks commonly are used to detect malignant transformations. A digital watermark is called robust if it resists a designated class of transformations. Robust watermarks may be used in copy ...
An audio watermark is a unique electronic identifier embedded in an audio signal, typically used to identify ownership of copyright. It is similar to a watermark on a photograph. Digital watermarking is the process of embedding information into a signal (e.g. audio, video or pictures) in a way that is difficult to remove. If the signal is ...