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patial domain methods (Schyndle et al., 1994; Hwang et al., 1999) are less complex but not robust against various attacks as no transform is used in them. The basic idea behind spatial domain methods is the modification of pixel intensities while embedding watermark. Transform domain methods are robust as compared to spatial domain methods. This is due to the fact that when image is inverse transformed, watermark is distributed irregularly over the image, making the attacker difficult to read or modify.