Reversible Digital Watermarking In Digital Images with Recovery Scheme

• Main Author: Chung, Farn Chon
• Format: Final Year Project
• Language: English
• Published: Universiti Teknologi PETRONAS 2011
• Subjects: T Technology (General)
• Online Access: http://utpedia.utp.edu.my/10582/1/2011%20-%20Reversible%20Digital%20Watermarking%20in%20Digital%20Images%20with%20Recovery%20Scheme.pdf; http://utpedia.utp.edu.my/10582/

Digital watermark is a signal that contains information that is inserted into a digital medium such as images, videos, audios and etc. Digital watermarking is the process of embedding a digital watermark into the digital medium. Watermarking is commonly applied for copyright protection, copy protection and authentication of the digital media. A reversible watermark can provide all this with some extra features which include removal of the watermark safely from the watermarked media to return back the original media. Current practise of watermarking is that the watermark was directly embedded into the digital image by altering the image pixel bit. However, the image pixels may not be able to restore to its original value when the watermark is removed from the image. Memory Watermarking technique is proposed where the watermarking process are conducted in the memory. The image and watermark are read as memory bytes and the watermark are drawn to the image in the memory without affecting the physical image file. The watermarked image in the memory is displayed to the users while the physical file of the original image and watermark remain separated. The watermark can be added and removed with the restored image pixels one hundred per cent (I 00%) matched the original image pixels. A simple recovery procedure was built in to restored the original image if found the image of the watermark file was tempered.