基于恢复函数和误差扩散的灰度图像分存方案

基于((n,n)-阈值的灰度图像分存方案利用恢复函数和误差扩散技术将一张秘密灰度图像分存到n张有意义的灰度分存图像中。所提方案选择n张有意义的灰度图像作为分存图像，以增强秘密图像的隐蔽性，达到保护图像信息安全的目的;采用误差扩散技术，可以产生具有良好视觉质量的分存图像。所生成的分存图像没有像素膨胀，其大小与秘密图像相等。此外，方案的重构过程简单快速，而且是无损的。实验结果和理论分析表明，所提方案能为秘密图像分存提供一个高安全和有效的机制。

Secret Gray-level Image Sharing Scheme Based on Recovery Function and Error Diffusion

A secret gray-level image sharing scheme based on a(n,n)-threshold, divides a secret gray-level image into n meaningful gray-level shadow images using recover function and error diffusion algorithm. In order to increase the steganographic effect for the security protection purpose, the proposed scheme selects n gray-level images containing meaningful contents as shadows. The proposed scheme can generate the shadow image with good visual quality by using error diffusion algorithm. The generated shadow image has no pixel expansion,and its size is ectual to the secret image's. Furthermore, the reconstructing process is fast and lossless. Experimental results and theoretical analysis demonstrate that the proposed scheme offers a high secure and effective mechanism for secret image sharing.