An Efficient Watermarking Process Based on Three-Level DWT and FFT Technique

Abstract

Digital image watermarking has become an interesting research field to face the issues created by the increasing use of Internet for distribution of digital data. For the couple of decades, authenticity of digital data has been concern for everyone. Digital image watermarking plays a vital role in protection of copy rights. In frequency domain watermarking, discrete cosine transform (DCT)-based watermarking process is most common because the majority of image compression methods are developed in DCT domain. This research presents a robust discrete wavelet transform (DWT) and fast Fourier transform (FFT) manner-based digital watermarking (DW). In the initial stage, split the original (cover) image into two horizontal and two vertical sub-bands using 3-DWT-FFT sub-band using changing their values. In this thesis, the embedding and extraction technique for watermarking is presented based on DWT & FFT transforms. In this technique, the embedding and de-embedding of the watermark is much easier than other transform techniques. Various values of PSNR’s, MSE’S & NC’s are analyzed for watermarked image quality and extracted watermark quality.