Comparative Study of SWT-SVD and DWT-SVD Digital Image Watermarking Technique

Due to use of the latest computer technology in early days with wide available tools with various advance application, it is very easy for the unknown users to produce illegal copies of multimedia data which are floating across the Internet. To protect multimedia data such as images, videos,etc. on the Internet many techniques are available including various encryption techniques, steganography techniques, watermarking techniques and information hiding techniques. Digital watermarking is a technique in which a piece of digital information is embedded into a cover image and extracted later for ownership verification. Secret digital data which is hidden can be embedded either in spatial domain or in frequency domain of the cover data. in this paper frequency domain technique is used.by using singular value decomposition (SVD) with existing method DWT (Discrete Wavelet transform) that is DWT-SVD Combine watermarking technique and proposed method includes stationary wavelet transformation (SWT) with SVD that is SWT-SVD based water marking technique is proposed for hiding watermark. The quality of the watermarked image and extracted watermark is measured using peak signal to noise ratio (PSNR). A user defined or predefined watermark can be embedded