A Blind Grayscale Watermarking Algorithm Based on Block DCT
一种基于分块DCT的盲灰度水印算法*

This paper proposes a meaningful 8-bit grayscale watermarking image embedding algorithm through using even-uneven identity and JPEG quantifying coefficients based on block Discrete Cosine Transform(DCT) hypo-low frequency AC coefficient. The cover image is not needed when extracting the watermarking data. And PN series is used to ensure watermarking security. The experiment results show that the algorithm has better robustness on JPEG and image cut.