Now a days it is very easy to use digital information available on internet because of the fast development in Information Communication Technology (ICT) sector. To provide facility of data authentication, security and copyright protection of digital media the technology being developed is a Digital Watermarking. For text or image, audio, video digital watermarking can be applied. In this paper it is focused only on image watermarking. In general, watermark can be embedded in transform domain or spatial domain technique of an image. A review of various watermarking techniques is presented in this paper. The paper also includes definition of watermarking features, requirements and performance of various watermarking techniques.
Keywords : Digital Watermarking, Techniques,DCT,,DWT ,SVD.