LU Li-Zheng Associate professor at Zhejiang Gongshang University. He received the bachelor and Ph.D. degrees from Zhejiang University, China in 2003 and 2008, respectively. His research interest covers geometric design and processing, computer graphics and image processing. Corresponding author of this paper. E-mail: lulz99@163.com QIU Yu-Yang Associate professor at Zhejiang Gongshang University. He received the bachelor, master and Ph. D. degrees from Zhejiang University, China in 2000, 2003 and 2007, respectively. His research interest covers matrix computation and image processing. E-mail: yuyangqiu@gmail.com