Page 1 of 2 EE 5351 Digital Video Coding Dr. K. R. Rao Project 14 Digital visible and invisible watermarking 1. Introduce a digital visible watermark on the Lena 512x512 image which is available through the course web site. Show the digital water marked images for different values of relative visibility constant and the retrieved water mark logo. The official UTA logo which is available through the link https://webapps.uta.edu/OITProjects/resources/images/uta_logo.gif can be considered as the digital watermark in this case. The size of the watermark is 88x300 pixels. Embed the water mark in the bottom right corner (fourth quadrant) of the Lena image. 2. a. Introduce a digital invisible watermark on the Lena 512x512 image. Consider the UTA logo as the digital watermark with size 88x300 pixels in this case too. Embed the water mark in the bottom right corner (fourth quadrant) of the Lena image. b. Show the digital watermarked image and the retrieved logo. c. Perform a JPEG lossless compression and de-compression on the digital invisible watermarked image. The reference software for JPEG lossless is available through the ftp link mentioned in the course web site. d. Show the de-compressed image and also the retrieved logo. Hints: For digital visible watermark use the following equation is the watermarked image, is the input Lena image, is the input digital watermark logo, is the relative visibility coefficient which varies between 0 and1. For digital invisible watermark use the following equation is the watermarked image, is the input Lena image, is the input digital watermark logo. Use unsigned integer arithmetic to perform the calculations which indicates replacing the last two LSB’s of the lena image with the two MSB’s of watermark logo in that block. You can use either C or Matlab for programming. Additional References: 1. Software for JPEG lossless codec can be obtained from ftp://sensin.unl.edu/pub/ 2. http://en.wikipedia.org/wiki/Lossless_JPEG 3. Diego Santa cruz and Touradj Ebrahimi ‚An Analytical study of JPEG 2000 Functionalities‛Page 2 of 2 IEEE transactions on Image processing, vol.2, pp.49-52, Sep 2000. 4. pp. 614-621, Rafael C. Gonzalez & Richard E. Woods, ‘Digital Image processing’, Pearson Prentice Hall, Third Edition. 5. M. Arnold, M. Schmucker and S.D. Wolthusen, ‚Digital watermarking and content protection: Techniques and applications‛, Norwood, MA: Artech House, 2003. 6. M. Barni and F. Bartolini ‚Watermarking systems engineering‛, New York, NY: Marcel Dekker, 2004. 7. http://users.on.net/~neerav/temp/digital_watermarking.pdf Images: Lena 512x512 Image Digital watermark 88x300 pixel