| Wavelet Based Image Authentication and Recovery |
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| 作者姓名： | Rafiullah Chamlawi Asifullah Khan and Adnan Idris |
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| 作者单位： | Pakistan Institute of Engineering and Applied Sciences (PLEAS) Nilore，Islamabad，Pakistan，Pakistan Institute of Engineering and Applied Sciences (PLEAS)，Nilore，Islamabad，Pakistan，A JK University，Rawalakot，Azad Jammu and Kashmir(AJK)，Pakistan |
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| 基金项目： | This work was supported by the Higher Education Commission of the Government of Pakistan under the Indigenous Ph.D.Scholarship Program(Grant No.17-5-1(Cu-180)HEC/Sch/2004/4343). |
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| 摘 要： | In this paper, we propose a secure semi-fragile watermarking technique based on integer wavelet transform with a choice of two watermarks to be embedded. A self-recovering algorithm is employed, that hides the image digest into some wavelet subbands for detecting possible illicit object manipulation undergone in the image. The semi-fragility makes the scheme tolerant against JPEG lossy compression with the quality factor as low as 70%, and locates the tampered area accurately. In addition, the system ensures more security because the embedded watermarks are protected with private keys. The computational complexity is reduced by using parameterized integer wavelet transform. Experimental results show that the proposed scheme guarantees safety of a watermark, recovery of image and localization of tampered area.
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| 关 键 词： | 子波成像 鉴定方法 离散余弦变换 水位标 |
| 收稿时间： | 14 March 2007 |
| 修稿时间： | 2007-03-14 |
Wavelet Based Image Authentication and Recovery |
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| Rafiullah Chamlawi,Asifullah Khan,and Adnan Idris.Wavelet Based Image Authentication and Recovery[J].Journal of Computer Science and Technology,2007,22(6):795-804. |
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| Authors: | Rafiullah Chamlawi Asifullah Khan Adnan Idris |
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| Affiliation: | (1) Pakistan Institute of Engineering and Applied Sciences (PIEAS), Nilore, Islamabad, Pakistan;(2) AJK University, Rawalakot, Azad Jammu and Kashmir (AJK), Pakistan |
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| Abstract: | In this paper,we propose a secure senti-fragile watermarking technique based on integer wavelet transform with a choice of two watermarks to be embedded.A self-recovering algorithm is employed,that hides the image digest into some wavelet subbands for detecting possible illicit object manipulation undergone in the image.The semi-fragility makes the scheme tolerant against JPEG lossy compression with the quality factor as low as 70%,and locates the tampered area accurately.In addition,the system ensures more security because the embedded watermarks are protected with private keys.The computational complexity is reduced by using parameterized integer wavelet transform.Experimental results show that tile proposed scheme guarantees safety of a watermark,recovery of image and localization of tampered area. |
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| Keywords: | semi-fragile watermark integer wavelet transform(IWT) discrete cosine transform(DCT) JPEG com-pression authenticcation and self-recovery |
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