Reversible Digital Watermarking In Digital Images with Recovery Scheme

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.