摘要
研究用于数字图像版权保护的数字水印嵌入技术,为保证数字水印的抗攻击性嵌入多张数字水印,但传统的数字水印嵌入需多次操作嵌入水印,极易造成对前水印的损坏,导致数字水印的稳健性不高的问题。为了解决这一难题,提出了一种基于DCT变换的多重数字水印嵌入技术,通过将数字水印图像分块,并经DCT变换得到多个频率块,根据频率块系数选取出数字水印的多个特征频率块,利用DWT变换将多个特征频率块融合后进行DCT反变换得到单个融合的数字水印,完成多重数字水印的嵌入,避免了多次嵌入操作损坏前水印的问题。仿真结果表明,这种方法不仅能够保证数字水印的抗攻击性,而且具有较高的稳健性,取得了满意的结果。
Research the copyright protection for digital image watermarking embedding technology.This paper put forward a multiple digital watermark technology based on DCT transform.The digital watermark image was partitioned into blocks,and the DCT transform was used to obtain multiple frequency blocks.According to the coefficient of frequency blocks,of the frequency characteristics were selected and fused with DWT transformation,then the inverse DWT transform was used to get a single digital watermarking,thus complete multiple digital watermarking embedding.Simulation experiments show that the method can ensure watermark resistant to attackd with high robustness,and achieves satisfactory results.
出处
《计算机仿真》
CSCD
北大核心
2012年第5期291-294,共4页
Computer Simulation
关键词
数字水印
抗攻击性
稳健性
Digital watermarking
Resistance to attack
Robustness
