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In this paper, we propose an adaptive, DCT based, blind image watermarking algorithm. The adaptability is developed, while exploring the properties of the human visual system (HVS), to embed robust watermarks in DCT matrices while making them the least visible in the space domain. In the algorithm, binary watermarks are embedded in image blocks having gray level variations sufficient to mask a certain...
In this paper, a new computation structure of image watermarking in DCT domain is presented. This structure employs a single DCT block, instead of two in many existing DCT watermarking systems, for the DCT computation of the image signal and that of the watermark. Using the single DCT block does not double the time required for the two 2-D DCT computations, as the amount of the calculations in this...
In this paper, a recursive algorithm for the computation of 2-D DCT is proposed. With this algorithm, the 2-D DCT can be performed by only one 1-D DCT block, which makes a significant reduction of the number of multiplications. The proposed algorithm can be easily implemented in VLSI circuits. A circuit structure has also been proposed. For a 4times4 DCT, the reduction of multiplication operations...
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