Hybrid computational schemes combining the advantages of a method moments formulation field integral equation and T-matrix are developed in this article. The hybrid methods particularly efficient when describing interaction electrically small complex objects large canonical shapes such as spherical multilayered bodies where is reduced to Mie series making an interesting alternative design impla...

This paper presents a modified digital image watermarking method based on nonnegative matrix factorization. Firstly, host image is factorized to the product of three nonnegative matrices. Then, the centric matrix is transferred to discrete cosine transform domain. Watermark is embedded in low frequency band of this matrix and next, the reverse of the transform is computed. Finally, watermarked ...