Abstract: The concept of multi-bits watermark is definite in this paper.The implementation of multi-bits watermark based
on multi-symbols coding are proposed using the characteristic non-interaction between irrelevant markers in embedding watermark
spatial.Method I implements spatial multiplexing multi-bit watermark embedding by spatial segmenting.Spatial domain
watermark algorithm based on toral automorphism and Hadamard transforms is used to deal with single tag field.Method II
uses frequency watermark algorithms based on DCT transform after spatial segmenting.Method III embedded multi-bit watermark
into image of the third layer wavelet decomposition coefficients by not intersect through the division into an independent
embedded space.The experiments show that above methods satisfy general multi-bits watermark application requirements.

摘要： 明确了多比特水印的概念，利用水印嵌入空间不相关标志之间无相互影响的特性，给出了基于多符号编码方法的三种多比特水印实现方法。方法1 通过空域分割实现并在单一标志域使用了基于置乱和哈达玛变换的空域水印处理技术；方法2 在空域分割后使用了基于DCT变换的频域水印技术；方法3 在对图像进行三层小波分解后通过对小波系数不相交的划分形成独立的嵌入空间。由实验结果看完全可以满足一般的多比特水印应用的要求。