Erratum to: Multimed Tools Appl

DOI 10.1007/s11042-016-3789-0

The published version of this article unfortunately contained an error. In the published paper, the Equation (7) was incorrect. It should be written as following:

$$ \begin{array}{l}K\left({x}_i,{x}_j\right)=\sqrt{d_1}{R}_i^{1^T}\cdot \sqrt{d_1}{R}_j^1+\dots +\sqrt{d_m}{R}_i^{m^T}\cdot \sqrt{d_m}{R}_j^m\hfill \\ {}\kern4em ={d}_1{K}_1\left({R}_i^1,{R}_j^1\right)+\dots +{d}_m{K}_m\left({R}_i^m,{R}_j^m\right)={\displaystyle \sum_{k=1}^m{d}_k{K}_k}\hfill \\ {}\kern7em {\displaystyle \sum_{k=1}^m{d}_k}=1\hfill \end{array} $$
(7)