一种基于DWT的数字水印分存算法

A Digital Watermarking Sharing Algorithm Based on DWT

改进DCT域中的数字水印分存算法,提出了一种在DWT域中利用多数字基整数实现的数字水印分存算法.该算法中,水印嵌入的强度由DWT域中的临界可见误差(JND)门限自适应调节,保证了水印的不可觉察性.实验证明,该算法在抵抗图像压缩、图像剪切等数字图像处理方面具有良好的稳健性.

Recently, a few of digital watermarking sharing algorithms based on DCT are accomplished in some literatures.An improved digital watermarking-sharing algorithm based on DWT is presented. The watermark is embedded in DWT domain with multiple-based number. Based on just noticeable difference thresholds in DWT domain, the watermark's strength is controlled dynamically without exceeding the thresholds. Hence, the transparency of the watermark can be guaranteed. Experimental results show that the proposed technique has good robustness to common image processing such as Gaussian noise, JPEG compression, cropping etc.