Based on the importance of universal extended matrix factorization in the fields of mathemat-ics and image processing,the optimal calculation formula of the Schur factorization,Hermite factorization,or-thogonal diagonal factorization and generalized inverse of universal extended matrix are derived by matrix de-composition theory.The results show that this method can reduce the computation and storage without reducing the numerical accuracy.It simplifies the color image blind watermarking algorithm based on universal extended matrix Schur factorization in digital copyright protection field.
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