基于DCT变换的图像伪装技术
DCT-BASED IMAGE HIDING ALGORITHM
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摘要: 该文提出一种频域的信息伪装技术,该技术具有以下几个优点:(1)隐藏效果好,人眼系统不能发觉隐藏了秘密图像的载体图像与原载体图像之间的差别;(2)口令控制,只有知晓伪装口令的人才能解密;(3)可以有效地抵抗JEPG等图像压缩编码的破坏;(4)利用载体图像的部分内容可以恢复原秘密图像;(5)该算法可以用于数字水印,而且可以将水印图像由二值图像扩展到灰度图像;(6)算法可以进行多址伪装,即在同一幅载体图像中隐藏多幅秘密图像。
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关键词:
- 信息伪装; 数字水印; DCT; DWT
Abstract: A new DCT-based information hiding algorithm is presented in this paper. The excellent features of the new method are: (1) the difference between the carrier image containing the secret and the original one is perceptually invisible; (2) the embedded secret image can be retrieved only by using a secret key; (3) it is robust against JPEG encode; (4) the embedded secret image can be extracted from part of carrier image containing the secret; (5) the method can be used to embed watermark into images, and the watermark may be an image ranged from 2 color to 256 or more color; (6) more than one secret, image can be hide into a single carrier image. -
C.J. Kuo, Novel image encryption technique and its application in progress transmission. Journal of Electronic Imaging, 1993, 2(4), 345-351.[2]S. Schwartz, A new graphical method for encryption of computer data. Cryptologia, 1991. 15(1),43-46.[3]Tung-Shou Chen, Chin-Chen Chang, Min-Shiang Hwang, A virtual image cryptosystem based upon vector quantization, IEEE Trans. on Image Processing, 1998. IP-7(10), 1485-1488.[4]丁玮,齐东旭,数字图像变换及信息隐藏与伪装技术,计算机学报,1998,21(9),838-843. -
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