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. Author manuscript; available in PMC: 2010 Oct 12.
Published in final edited form as: Proc SPIE Int Soc Opt Eng. 2007 Jan 1;6510:651002. doi: 10.1117/12.716908

Figure 1.

Figure 1

Left: a 9 × 9 Toeplitz matrix that might represent the covariance matrix of a 9-element linear detector in digital radiography. Right: the corresponding circulant matrix obtained by pretending that the distances are computed modulo 9.