Consideration of a robust watermarking algorithm for color image using improved QR decomposition

In order to protect the digital image copyright, it is necessary design a robust watermarking algorithm. To achieve this purpose, novel color scheme based on an improved QR decomposition proposed in paper. The method gives new algorithm find elements of Q and R matrices instead using Gram–Schmidt for factorization. First, matrix performed by solving set linear equations where diagonal are checked modified if they zero or negative. After that, computed matrix. addition, formula improve extracting time first element R(1, 1) found computing as previous proposals. Experimental results show that outperforms other considered methods paper terms quality watermarked images. Furthermore, execution significantly improved, extracted watermark more against almost tested attacks.