Copyright 2009 by SPIE and IS\&T. This paper was published in the proceedings of IS\&T/SPIE Electronic Imaging 2009 Conference in San Jose, USA, and is made available as an electronic reprint with permission of SPIE and IS\&T. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
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