Một số lược đồ thủy vân mới dựa trên phân tích QR
Abstract
In this paper, we propose two watermarking schemes based on QR decomposition, called QR-1 and QR-N. In comparision with watermarking schemes based on SVD decomposition of R. Sun et.al and P. Bao et.al, the proposed schemes have lower computational complexity, higher security, better quality of watermarked image and more robustness against some image processing attacks. Moreover, scheme QR-1 is also more robustness than the scheme based on QR decomposition of Song Wei et.al.