Digital Watermarking Essay

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In recent years, as digital media are achievement wider popularity, their security related issues are suitable superior concern. Digital watermark was first discovering in 1992 by Andrew Tirkel and Charles Osborne. Watermark is derived from the german term “Wessmark. The first watermarks devolved in Italy during the 13th century, but their use apace spread across Europe. Watermarking can be measured as special techniques of steganography where one message is embedded in another and the two messages are related to each other. Digital watermarking is similar to watermarking technique which allows an individual to add exclusive rights notices or other verification messages to digital media. Image authentication’s one of the applications of digital watermarking, which is used for authenticating the digital images. A digital watermark is a kind of marker covertly embedded in a noise-tolerant image such as audio or image data. It is typically used to identify ownership of the copyright of such image. "Watermarking" is the process of hiding digital information in an image the hidden information should but does not need to contain a relation to the image. The security and enforcement of academic property rights for digital media has become an important issue [2].

The way to understand this feature is to embed a level of the authentication signature into the digital image using a digital watermark. In the case of the image being tampered, it can easily be detected as the pixel values of the embedded data would change and do not match with the original pixel values. There are many spatial and frequency domain techniques are available for authentication of watermarking. Watermarking techniques are judged on the basis of their performance on...

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...many bits received in error over the number of the total bits received.
BER=P/((H*W) )
Where,
H and W are height and width of the watermarked image.
P is the count number initialized to zero.

Conclusion

In this paper we have obtainable various aspects for digital watermarking like introduction, outline, techniques, and applications. Separately from it a brief and relative analysis of watermarking techniques is presented with their advantages and disadvantages which can help the new researchers in these areas. We also tried to classify the digital watermarking in all the known aspects like robustness, perceptivity, purpose, watermark type, domain, and detection process. In this paper we tried to give the whole information about the digital watermarking which will help the new researchers to get the maximum awareness in this domain.

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