期刊名称：Journal of Theoretical and Applied Information Technology
印刷版ISSN：1992-8645
电子版ISSN：1817-3195
出版年度：2012
卷号：42
期号：2
页码：287-291
出版社：Journal of Theoretical and Applied
摘要：A novel semi-fragile watermarking scheme for Image tamper localization and recovery is proposed. The Logistic map is used to encrypt the feature extracted from the original image, then the generated watermark is embedded into the middle-frequency DCT coefficients of each block after being ordered in zigzag manner based on invariance properties of DCT coefficients before and after JPEG compressions. As for authentication, firstly, the feature information is extracted after decryption, and compared it with reconstructed feature information, then, the tamper matrix is generated. Finally, recover the invalid blocks by using bicubic interpolation. Experimental results illustrate that the watermarked image has good imperceptibility and can tolerate the common content-preserving image processing. It is also sensitive to malicious manipulations and can localize and recover tampered regions approximately.
