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Introduction

Digital watermarking is the technology of inserting, and most of the time, hiding messages in noise- tolerant digital signals, such as images, videos and audios. The technology is mainly used for copyright protection but it also has applications to fields such as,

Copyright protection

Fingerprinting

Ownership assertion

Fraud&temper detection

ID card security

Deter digital counterfeiting bank notes

The following is a top level illustration of general procedures of embedding, transmitting and extracting a digital watermark in an image.

The following is our Host and Watermarked image, which looks pretty much the same to naked eye.

Host image

Watermarked image

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Source:  OpenStax, Robustness analysis on dct watermarking technique under compression attack. OpenStax CNX. Dec 19, 2012 Download for free at http://cnx.org/content/col11472/1.1
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