Color Stereo Image Zero-Watermarking using Quaternion Radial Tchebichef Moments

This paper presents a new zero-watermarking scheme, for the copyright protection of stereo color images, based on the Quaternion Radial Tchebichef Moments (QRTMs) and on a chaotic system very sensitive to the initial values. The novelties of this scheme are as follows: (1) QRTMs are applied for the first time in the zero-watermarking scheme for stereo color image; (2) The QRTMs used in the proposed scheme have no numerical instability, which effectively improves the performance of the zero-watermarking scheme; (3) the proposed scheme based on QRTMs effectively resists geometric attacks such as: rotation, uniform scaling and non-uniform scaling; and (4) The chaotic system used is extremely dependent on the initial values, which offers the proposed scheme a high level of security. Experimental results show that the performance of the proposed scheme is superior to that of similar zero-watermarking schemes and other watermarking schemes of stereo color images.