Watermarking

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Watermarking

ContentsIntroductionHistoryTypes of watermarkAttributes associated with watermarking Techniques ApplicationsAdvantagesDisadvantagesConclusionReferences

IntroductionDigital Watermarking describes methods

and technologies that hide information, for example a number or text, in digital media, such as images, video.

Watermarking is the insertion of imperceptible and inseparable information into data for data integrity.

General Watermarking

Procedure

History More than 700 years ago, watermarks were used

in Italy to indicate the paper brand and the mill that produced it.

By the 18th century watermarks began to be used as Anticounterfeiting measures on money and other documents. The term watermark was introduced near the end of the 18th century.

The first example of a technology similar to digital watermarking is a patent filed in 1954 by Emil Hem Brooke .

In 1988, Komatsu and Tominaga appear to be the first to use the term “digital watermarking”.

Digital Watermark

Digital watermark is a message which is embedded into digital content that can be extracted or detected later.

Types of Watermark

VisibleInvisiblePublicFragile

Attributes Associated With Watermarking

Imperceptibility Robustness Security Complexity Verification

Watermarking Techniques• Watermarking for text

Word space coding Line shift coding

Watermarking Techniques……..• Watermarking for text

Feature coding

Watermarking Techniques……• watermarking for images

spatial domain watermarkingFrequency domain watermarking

Detection of watermarks

Applications• Copy prevention or control

• In the field of data security

Applications………• Tampering with images