Watermarking Research Paper

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Chapter – 1 Introduction
1.1 Need of Watermarking Digital multimedia information are rapidly spreading everywhere. On the other side, this situation has brought about the possibility of duplicating and manipulating the data. To continue with the transmission of data over the Internet the reliability and originality transmitted data should be verifiable. It is necessary that digital multimedia information should be protected and secured. To provide copy protection and copyright protection for digital audio and video data, two complementary techniques are being developed for encryption and watermarking. Encryption techniques can be used to secure and protect digital data during the transmission …show more content…

Digital watermarking makes law enforcement and copyright protection for digital media possible and practical when it aims to automatically detect and possibly also prosecute copyright infringements. The watermark stems from the ancient art of a figure or design incorporated into paper during its manufacture and appearing lighter than the rest of the sheet when viewed in transmitted light for the same purpose.

Figure 1.1: Perceptible watermark embedded in a figure [1] The important requirements of digital watermarking are given and described as below. However, the relative importance of these parameters depends on the application.

1.1.1 Transparency (invisibility) This refers to perceptual similarity between the watermarked image and the original image. The watermark should be imperceptible. It means that no visual or audio effect should be perceived by the end user. The watermark should not degrade the quality of the original content, but in some applications may accept a little degradation to have higher robustness or lower cost. Sometimes digital watermark is embedded to data in the way that can be seen without extraction, called it visible watermark. The example of visible watermark is …show more content…

In this particular, the owner can embed different watermarks in the copies of data those are supplied to different user. Fingerprinting can be compared to embedding a serial number i.e. related to the user’s uniqueness in the data. It enables the intellectual property owner to identify customers who have broken their license agreement by providing the data to third parties [4]. Such practice is widely used in internet music sales. The buyer fills out a form in which user inserts his personal and other important information which the salesman converts such information into his own unique fingerprint format and embeds it into the song before downloading to the buyer. Other case is the vendor let users install its own music player software on their computers. For certain period of time the vendor will allow users listen to sample of music but which later must be bought with price after the set time expires, the software prohibits the user from listening to such songs since it always checks the songs for license every time the user tries to play

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