中文摘要：

为了解决真彩色大秘密图像的安全传输问题,提出了一种基于拉格朗日插值多项式的图像分存方案;该方案通过对真彩色大秘密图像进行压缩、量化、编码、分解、译码等处理生成秘密图像的n个影子,再将每个影子隐藏于一幅尺寸是秘密图像的t分之一大小的可视的载体图像中,任取其中的t个嵌入秘密图像影子的载体图像,就能恢复原始秘密图像;同时给出了分存原理和直接恢复公式,提高了图像分存和恢复的速度,简化了计算过程。

英文摘要：

In order to solve the problem of security of transmitting the color big secret image, the secret image sharing method based on the Lagrange＇s interpolating polynomial, is proposed. The n shadow hnages of the secret image were made by compressing substituting cod ing and disassembling etc. Each shadow image is hidden in all ordinary image so as not to attract an attacker＇s attention, the size of each stego image （in which a shadow image is hidden） is about 1/t of the seerct image. Any t of the n stego images can be used to recover the original secret image. At the same time the shared princlpieand the comeback＇s expressions is brought, the speed oftheimage sharing and comeback is heightened, the process of calculate is predigested.