Abstract
This paper presents a DWT-DCT-SVD based hybrid watermarking method for color images. Robustness is achieved by applying DCT to specific wavelet sub-bands and then factorizing each quadrant of frequency sub-band using singular value decomposition. Watermark is embedded in host image by modifying singular values of host image. Performance of this technique is then compared by replacing DCT by Walsh in above combination. Walsh results in computationally faster method and acceptable performance. Imperceptibility of method is tested by embedding watermark in HL2, HH2 and HH1 frequency sub- bands. Embedding watermark in HH1 proves to be more robust and imperceptible than using HL2 and HH2 sub-bands.
Highlights
Advancement in technology has resulted in use of digital data which includes text, images, audio, video and multimedia data
It can be seen that, as scaling factor is increased (0≤K≤1), quality of host image is degraded. This is due to considerable changes taking place into singular values of frequency components of host image with increased value of K
Loss of perceptibility is less when watermark is embedded in high frequency components of host image
Summary
Advancement in technology has resulted in use of digital data which includes text, images, audio, video and multimedia data. Technology has made it easy to duplicate/manipulate the contents of these data by various means. Piracy is a very good example of this. Authentication of data becomes obvious requirement before it is made available as digital data. Authentication includes information of owner of data within data itself to avoid taking undue credit as well as to prevent tampering of data. Digital watermarking is one of the most popular techniques used for digital data authentication
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
