Equations (12) and (13) in a previous Letter [Opt. Lett. 37, 2778 (2012)] were incorrect due to a mistake in writing and are modified here.
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The authors of  would like to point out that they made a mistake in writing Eqs. (12) and (13) on page 2779 in ; however, the implementation of the proposed algorithm in  is correct. Equations (12) and (13) should have read as follows:
1. L. Yan, H. Fang, and S. Zhong, Opt. Lett. 37, 2778 (2012).
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