A novel multipurpose watermarking algorithm for image authentication and protection

A novel multiple watermarking scheme was proposed, which can simultaneously achieve copyright protection and content authentication without the mutual interference. The region of interest (ROI) of a host image was selected by an image energy function, and the fragile watermark was embedded in ROI through quantizing the middle coefficients. Based on visual masking, the robust watermark was embedded in non-ROI. While the extraction of robust watermark needed the secret key and the seams, the fragile watermark extraction just needed the seams. The experimental results illustrate that the fragile watermark is weak against many kinds of attack, which can be used to determine whether the ROI is attacked, and that the robust watermark can resist image processing operation, adding noise, JPEG and RML.