利用分块DCT系数的周期特性,结合Z字形编码置乱技术和JPEG量化系数,提出了一种在分块DCT中频交流系数中嵌入有含义二值水印图像,以实现盲检测的水印方案。实验结果表明,该算法对图像剪切、JPEG有损压缩、中值滤波等攻击有很强的鲁棒性。
Through using the periodic property of DCT coefficients, the digital image scrambling transformation namely Zigzag Scan and JPEG quantifying coefficients, this paper proposes a meaningful 2-bit watermarking image embedding algorithm on block discrete cosine transform intemediate frequency AC coefficients. The cover image is not needed when extracting the watermarking data. The experiment results show that the algorithm has good robustness on image cut, JPEG and median filter.