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A blind watermarking algorithm based on DCT for digital image is proposed, in which a 2-bit image embeds in a 8-bit gray image. Preprocess of image watermark, watermark embedding and extraction are the main parts of the algorithm. In the preprocess of image watermark Arnold scrambling is used to reduce the relevance of the watermark and also to improve the robustness of the image embedded watermark...
The paper presents a blind digital image watermarking algorithm in the DCT domain, which use a average value of DCT coefficient as a threshold to realize the watermark embedding. In the process of embedding the watermark image is processed by Arnold transformation and the original image is divided into some blocks which are transformed into coefficients in the DCT domain. The average value of coefficients...
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