摘要: 针对现有的差扩算法位置图难以压缩的问题,提出一种采用奇偶不变特性、和値不变特性、差值调节和块差扩相融合的可逆水印改进嵌入算法。该算法对宿主图像实施2×2的像素分块,采用横向扫描与纵向扫描相融合的方式嵌入水印。实验结果证明,该算法提高了可逆水印的嵌入容量,仅产生1/4宿主图像大小的位置图,具有较高的实用价值。
关键词:
可逆水印,
差扩算法,
奇偶不变特性,
和值不变特性,
差值调节
Abstract: To solve the problem that the position graph which can not be best compressed in the existing difference expansion authentications, this paper proposes a reversible image embedding authentication, which combines the Reversible Watermark based on Invariability and Adjustment on Pixel Pairs(RWIAPP) and block difference expansion method together. This algorithm separates the host graph to 2×2 pixel blocks, and scans each block in both transverse dimension and vertical dimension. Experimental results show that the proposed algorithm can not only improve the reversible embedding capacity, but also produces only 1/4 host image size drawing. Therefore, this algorithm has better practical value.
Key words:
reversible watermark,
difference expansion algorithm,
odd-even invariant feature,
summation invariant feature,
Pairwise Difference Adjustment(PDA)
中图分类号:
吕林涛, 张玺. 改进的大容量可逆数字水印嵌入算法[J]. 计算机工程, 2011, 37(22): 107-109.
LV Lin-Chao, ZHANG Xi. Improved Large Capacity Reversible Digital Watermark Embedding Algorithm[J]. Computer Engineering, 2011, 37(22): 107-109.