摘要： 当前多数水印方法通过实验获取最佳融合参数或直接采用固定的融合参数，但都无法获得理想的效果。为此，提出一种自适应计算融合参数的方法，该方法可以针对不同的载体图像、水印信息及攻击类型计算出对应的融合参数。与现有方法相比，该方法可以避免重复实验，无需对嵌入水印的载体图像所受攻击类型进行预估。实验结果表明，该方法自适应能力强、运算效率较高。

关键词: 灰度水印, 自适应融合, 拼贴误差, 分形编码, 峰值信噪比

Abstract: Digital watermark technique is proposed as a solution for problems of copyright projection. Most of current image watermark schemes embed watermark into host image twice. In these schemes, the values of fusion parameter effects on the visual of exacted watermark information. This paper presents a new method to compute fusion parameter adaptively which can get different result based on different host images, watermark information. It is one important aspect way that it can avoid repeat experiment and estimate of the kind of attack. Experimental results show that the proposed way yield good visual effects.

Key words: gray scale watermark, adaptive fusion, collage error, fractional coding, Peak Signal-to-Noise Ratio(PSNR)

中图分类号: 

• N945