Abstract
Implementing a watermarking algorithm with high security and low computational complexity is a challenge, especially at a limited distortion level. A novel watermarking scheme is proposed in this paper, which is based on Tent-Logistic-Cosine Map (TLCM) and Direct Current (DC) coefficient modification. Firstly, the watermark is encrypted by a matrix obtained from TLCM. Then, the cover image is divided into non-overlapping \(4 \times 4\) sub-blocks and some blocks are selected randomly. Thereafter, the DC coefficients of selected blocks are calculated directly in the spatial domain without performing two-dimensional discrete cosine transform. Finally, using the proposed watermark embedding procedure, DC coefficients of selected blocks are updated according to the encrypted watermark bits. Results show that the proposed watermarking algorithm has high security and low computational complexity at a limited distortion.
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