Most previous watermarking schemes with image invariant features perform poorly under common image processing operations as well as geometric distortions.A robust image watermarking scheme based on local Tchebichef moments is proposed.Harris-Laplace detector is first adopted to extract feature points.Then,the stable and non-overlapped circular feature regions are chosen via the proposed feature selection criteria.Finally,Tchebichef moments are computed over these feature regions and watermark is embedded in...