Robustness Analysis of a Digital Image Watermarking Technique for Various Frequency Bands in DCT Domain

Internet has made multimedia communication easier than ever. In present scenario huge amount of information is being shared as digital content. Copying of such digital content without apparent loss in quality is not a difficult task. Due to this, there are more chances of copying of such digital information. Thus, there is a great need of prohibiting such illegal copying of digital media. Digital Watermarking (DWM) is a powerful solution to this problem. Digital Watermarking refers to embedding of special information in the cover medium that needs to be protected from illegal copying. The work presented in this paper is concerned with implementation of a digital image watermarking technique in DCT domain. Watermark has been embedded using modified Cox Formula. Robustness analysis has been carried out for various attacks with watermark embedded in different frequency regions. The results obtained have been compared with some existing algorithms. Experimental results efficacy of the performed work.