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A108 vaishnavi jumde.pptx
- 1. A Seminar On Digital Watermarking name:- vaishnavi Santosh jumde Class:-Bsc III year Roll No:-A108
- 2. Contents Introduction History Types of watermark Attributes associated with watermarking Techniques Applications
- 3. Introduction Digital Watermarking describes methods and technologies that hide information, for example a number or text, in digital media, such as images, video. Watermarking is the insertion of imperceptible and inseparable information into data for data integrity.
- 4. History More than 700 years ago, watermarks were used in Italy to indicate the paper brand and the mill that produced it. By the 18th century watermarks began to be usedas Anticounterfeiting measures on money andother documents. The term watermark wasintroduced near the end of the 18th century. The first example of a technology similar to digital watermarking is a patent filed in 1954 by Emil Hem Brooke. In 1988, Komatsu and Tominaga appear to be thefirst to use the term "digital watermarking".
- 5. Digital Watermark Digital watermark is a message which is embedded into digital content that can be extracted or detected later.
- 6. Types of Watermark Visible Invisible Public Fragile
- 7. Invisible Watermarking Invisible watermark is embedded into the data in such a way that the changes made to the pixel values are perceptually not noticed. Invisible watermark is used as evidence of ownership and to detect misappropriated images.
- 8. Visible Watermarking Visible watermark is a translucent overlaid into an image and is visible to the viewer. Visible watermarking is used to indicate ownership and for copyright protection.
- 9. Attributes Associated WithWatermarking Imperceptibility Robustness Security Complexity Verification
- 10. Watermarking Techniques...... watermarking for imagesspatial domain watermarkingFrequency domain watermarkingDetection of watermarks
- 11. Watermarking Techniques........• Watermarking for text چتاFeature coding Indian Institute of Science, Bangalore | Indian Institute of Science, Bangaloreii Indian Institute of Science, Bangalore
- 12. Dual Watermarking Dual watermark is the combination of visible and invisible watermark. An invisible watermark is used as a backup for the visible watermark.
- 13. General Watermarking Procedure General Watermarking Procedure
- 14. Applications Copy prevention or control In the field of data security
- 15. Security In case the key used during watermark is lost anyone can read the watermark and remove it. In case the watermark is public, it can be encoded and copyright information is lost.
- 16. Thank you