Semi-fragile Watermark Algorithm of Color Image Based on Slant Transform
Yue Wang · Jisuanji gongcheng · 2012
This paper proposes an algorithm that can authenticate image and restore tampered region by embedding the authentication watermark and restore watermark.Authentication watermark is embedded in the region of green component by slant transformed.The compressed and slant transformed coefficients as restore watermark are embeded into the least significant bit of each component.If the image is suffered tamper,the last bit of each component can also extract to achieve the image of the self-recovery.Theoretical analysis and experimental results show that under the premise of ensuring transparency and good robustness,the algorithm not only can detect the tampered area but also can restore the tempered region approximation.