During the last decade, digital watermarking has become an active research area focused on digital data protection. The modern multimedia systems require powerful data protection algorithms. Due to the advances in the development of digital data and the modern way of communication, a number of watermarking procedure have been proposed. The watermarking purposes are classified as ownership protection, protection and proof of copyrights, data authenticity protection, tracking of digital copies, and copy and access control.
This chapter deals with the concepts of watermark embedding and watermark detection theory. Several interesting and commonly used algorithms for image and audio watermarking are presented. As an advanced level, the recently developed combined time–frequency watermarking approaches are also considered.
KeywordsImage Watermark Pseudorandom Sequence Watermark Embedding Watermark Technique Fragile Watermark
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