COMPARISON BETWEEN TWO WATERMARKING ALGORITHMS USING DCT COEFFICIENT, AND LSB REPLACEMENT

Digital watermarking is a method through which we can authenticate images, videos and even texts. Watermarking functions are not only authentication, but also protection for such documents against malicious intentions to change such documents or even claim the rights of such documents. In this paper two watermarking algorithms are simulated. The first algorithm is based on the Discrete Cosine Transform (DCT)(in the frequency domain) and the second algorithm is based on the least significant bit (LSB)replacement (in the spatial domain). The results are shown and compared under different kinds of attacks.

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