基于直方图平移的多遍与多比特嵌入性能比较

为了提高基于直方图平移可逆数字水印算法的一遍嵌入容量,有些研究者提出了基于多比特嵌入策略的可逆水印算法,但这些算法未与已存在的单比特多遍嵌入算法进行性能比较。分析了影响基于直方图平移可逆水印算法图像质量的原因,并对多遍单比特和一遍多比特嵌入可逆水印算法的性能进行了理论比较,指出在嵌入容量相同的条件下,多遍单比特嵌入的图像质量明显优于一遍多比特嵌入算法。对大量的标准测试图像进行仿真实验,证明了理论分析的正确性, 为设计基于直方图平移的可逆水印算法提供了参考依据。

Performance comparison with multi-pass and multi-bit embedding based on histogram shifting

In order to improve the single-pass embedding capacity of reversible watermarking algorithm based on histogram shifting, some researchers propose novel reversible watermarking algorithm based on multi-bit strategy. However, these algorithms do not compare with existing multi-pass single-bit algorithms. In this paper, we analyze the reasons of effecting image quality of reversible watermarking algorithm based on histogram shifting, and compare the performance with multi-pass single-bit and single-pass multi-bit reversible watermarking algorithm in theoretical, and point out that under the conditions of the same capacity, the image quality of multi-pass single-bit exceed single-pass multi-bit algorithms. Extensive simulations on standard test images demonstrate the correctness of theoretical analysis, and provide a basis for the design of reversible watermarking algorithm based on histogram shifting.