Evaluation of Lossless Watermarking Techniques
 | International Journal of Computer Trends and Technology (IJCTT) |  |
| © - April Issue 2013 by IJCTT Journal | ||
| Volume-4 Issue-4 | ||
| Year of Publication : 2013 | ||
| Authors :Dr.Smitha Rao |
Dr.Smitha Rao "Evaluation of Lossless Watermarking Techniques"International Journal of Computer Trends and Technology (IJCTT),V4(4):467-471 April Issue 2013 .ISSN 2231-2803.www.ijcttjournal.org. Published by Seventh Sense Research Group.
Abstract: -One of the mechanisms to deter unauthorized copy and distribution of digital media is Digital Watermarking. Digital watermarking involves embedding of identifying information into the digital content which can be later recovered for verification and authentication. In conventional watermarking schemes certain amount of distortion to the recovered image is acceptable. This does not apply to all applications, particularly in military applications, space and medical imagery etc., loss of a single bit of information from the original image is not acceptable. Reversible watermarking is a novel category of watermarking schemes that can not only strengthen the ownership of the original media but also can completely recover the original media from the watermarked media. In reversible watermarking, the embedding process has an additional burden of embedding extra information in the payload that includes the recovery data that is used by the decoder to reconstruct the original image bit by bit. Thus the payload consists of the authentication information and recovery data. Reversible watermarking is especially suitable for the applications that require high quality images like for certain applications of digital media such as for legal evidence, digital commerce, security surveillance etc. any modification/tampering done to media has to be detected. Various lossless watermarking schemes are discussed in this paper.
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Keywords — Reversible Coding, PSNR, Histogram modification, Difference Expansion, DWT, Fragile Watermarking, Blind Watermarking