Comparative Analysis of Watermarking in Digital Images.
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Watermarking is the practice of imperceptibly altering a piece of data in order to embed information about the data. According to the definition there are two important characteristics of watermarking. First, information embedding should not cause perceptible changes to the host medium. Second, the message should be related to the host medium.
The watermark to be embedded may be a binary image, a bit stream or a pseudo-random number that adheres to, say, a Gaussian distribution. The watermark is then appended to the desired coefficients (low frequency or intermediate frequency) of the transform, as recommended by Human Visual System (HVS) research. The watermarked image is the output.
An efficient watermarking technique should verify many conditions Robert and Shanmugapriya (2009) of imperceptibility, robustness and security where the imperceptibility refers to the perceptual.
Digital image watermarking is an attractive research area since it protects the multimedia data from unauthorized access. For designing an efficient and robust digital image watermarking system, the trade-off among imperceptibility, robustness, capacity, and security must be maintained. Various studies regarding this concern have been performed to ensure these requirements by hybridizing.
In this paper we gave broad spectrum of watermarking applications in compressed encrypted images. Big data and related computing are inching towards green computing. Issues in the big data like ownership and security is a great cause of concern for the computer professionals. After this review we come to the following conclusion:- 1. Images are playing very crucial role in the decision making.
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