RST invariant digital image watermarking based on resynchronization

The paper presents a new rotation, scaling and translation (RST) invariant digital image watermarking scheme based on log-polar mapping and the phase-only filtering method. The watermark is imperceptibly embedded in the spatial domain. Log-polar mapping and the phase-only filtering method are used to generate resistance to common geometric attacks such as rotation, scaling and translation. Experiments show that the proposed scheme is robust against various attacks, including geometric attacks.