A semi-fragile watermark algorithm for image authentication is proposed, which has adaptability, and uses improved low-pass filter. The threshold values of grads are set according to resolving power of human eyes. Experimental results show that the proposed algorithm is robust to common data processing, which can resist JEPG top-level compression, as well the algorithm is fragile to malicious attack, such as abrasion, distortion, extrusion, lighting, and so on. Moreover, the tampered sort and area of watermarked image can be reflected

Semi-fragile spatial watermarking.PDF

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