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. Author manuscript; available in PMC: 2011 May 25.
Published in final edited form as: Proc SPIE Int Soc Opt Eng. 2007 Jan 1;6515(65150 Suppl):1–7. doi: 10.1117/12.707800

Figure 2.

Figure 2

The behavior of the estimated SNR as a function of the number of samples used to estimate the background covariance term. The value of ε was set to (a) 1 × 10−5, (b) 1 × 10−3 and (c) 1. When ε is small, we see a transition when the number of samples equals 64, the dimension of the image data g. The solid lines represent the actual Hotelling observer performance.