Digital watermarking is the powerful solution to copyright protection of digital media. Digital watermarking is nothing but the process of embedding information as watermark, in to the digital content which is to be protected from unauthenticated copying. Digital watermarking is having some other applications as copyright protection, fingerprinting, owner identification etc. Application of watermarks is depending upon the types of watermarks classification such as fragile, robust, visible and invisible. The main requirements of digital watermarks are integrity, robustness and complexity. This paper presents the measure of recovered image quality in terms of signal to noise ratio and similarity ratio, two dimensional discrete cosines transform (DCT2) watermarking and two dimensional fast Fourier transform (FFT2) watermarking methods.
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