基于融合的数字图像隐藏技术具有隐藏信息量大、方法简便等优点。为此,在已有方法的基础上,通过对信息融合实质的分析,运用数字图像“分存”的思想,提出了基于RB(rational Bézier)曲线的多幅数字图像融合方法。该方法利用n次有理Bézier曲线、k阶[n/n]型RB曲线、附权的[n/n]型RB曲线将一幅秘密图像隐藏于n幅公开图像中。该方法具有更多的融合因子,而且这些因子可以组合成更多的密钥,不仅能保证融合图像和恢复图像的质量,也增强了抵抗攻击的能力。该方法结合对图像的“置乱”处理,将更能增强整个隐藏系统的安全性。通过与其他方法的对比实例分析显示,采用该方法可得到更好的融合效果,方法简单易行,并有一定程度的鲁棒性。此外,该方法还可以推广到数字水印的研究与应用中。

On the basis of digital image’s information sharing, a new blending approach based on RB curve is presented. The approachmakes use of an degree rational Bézier curve or akdegree2[n/n]RB curve or a[n/n]RB curve with weights to hide information of one image intonimages. These blending schemes have more blending parameters to act as the private keys, which can enhance the security and robustness of the hiding image. Furthermore, the schemes can be combined with the scrambling technology, which is usually used as pre2process and post process of digital image information hiding. Experimental results show that these schemes can be realized expediently and have some degree of robustness. These blending schemes can also be used in the field of digital watermarking and other digital application.