Semi-Fragile Watermarking for JPEG2000 Image Authentication

In this paper,a semi-fragile watermarking algorithm is proposed for JPEG2000 image authentication.The algorithm is combined with the JPEG2000 image coding process.The watermark is generated and embedded based on an invariant property of DWT coefficients during the JPEG2000 compression.Once the watermarked image is tampered,the alteration regions can be located according to primary properties of the wavelet transform.The experimental results demonstrate that the watermarked image possesses good perceptual transparence,and that the proposed algorithm can detect any change to the watermarked JPEG2000 image as well as locate the tampered areas.