A Novel Semi-fragile Digital Watermarking Scheme for Scrambled Image Authentication and Restoration

More than ever, the practical and accurate watermarking technologies are called for the growing amount of exchanged digital image over the Internet. To protect the integrity and authenticity of digital image and to enhance the effect of tamper detection and restoration, we design and implement a semi-fragile watermark based on cat transformation, mostly used to locate tamper and recover for the transformed image and plain-image. The watermark...