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References
[1]. Charles A. Bouman, Digital Image Processing Laboratory: Eigen-decomposition of Images. February 22, 2013
[2]. Mireille Boutin, "ECE662: Statistical Pattern Recognition and Decision Making Processes," Purdue University, Spring 2014.
[3]. Gilbert Strang, Linear Algebra and its Applications. Thomson Brooks/Cole. 4th Edition, 2006.