Digital Image Watermarking using Fast Fourier Transform to Minimization of Different Attacks

The real world of today is that of the digital world. Digital data is being used immensely in every field nowadays. Copying computer data without lack of accuracy isnot so difficult. And the risks of copying these digital data are higher. So, theres a big need to ban digital media from such illegal copyright. Digital watermarking (DWM) is a solid solution to this problem. Digital watermarking is nothing more than the technology in which several data are embedded into digital content that we have to secure from illegal copying. Digital watermarking has various applications such as fingerprinting, owner identification and so on. Digital watermarks are durable, porous, transparent, and invisible, of different types. Digital watermarks have some demands as integrity, robustness and complexity. This project presents a digital watermarking image based on two-dimensional discrete wavelet transformation (DWT2), two-dimensional fast Fourier transformation (FFT2), two-dimensional discrete cosine transformation (DCT2) and. Signal to noise ratio ( SNR) and similarity ratio (SR) are determined for each transform to determine the image quality.