一种结合LSB和DCT的数字水印算法

提出了一种基于改进的LSB和DCT相结合的新的水印嵌入算法,根据水印内容将水印信号分成重要和不重要两部分,分别嵌入到载体图像频域和时域中.该算法不仅扩大了数字水印的嵌入容量,还提高了水印的鲁棒性及安全性.实验表明,本算法鲁棒性优于LSB算法并且隐藏容量大于DCT算法.

An image watermarking technique based on combinational LSB and DCT

In order to provide more watermarks and to minimize the distortion of the watermarked image,a novel technique using the combinational improved LSB and DCT is presented.The watermark image can be split into two parts.The crucial part is inserted into frequency-domain and the other part into the spatial-domain.Experimental results provide the comparisons when different size watermarks are embedded into a gray-scale image.More watermark data can be inserted into the image so that the capacity is increased.The splitting of the watermark into two parts makes the degree of protection double.This technique can make the watermarked image more secure and robust.