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. Author manuscript; available in PMC: 2010 Sep 21.
Published in final edited form as: J Opt Soc Am A Opt Image Sci Vis. 2001 Mar;18(3):473–488. doi: 10.1364/josaa.18.000473

Fig. 2.

Fig. 2

Noise and signal power spectra. Plots of signal and noise power spectra as a function of radial frequencies (in pixels−1). (a) Components of the noise-power spectrum (NPS). The total NPS is the sum of the quantum and anatomical components multiplied by the filter spectrum. (b) Components of the signal spectrum. The total signal spectrum is the product of the signal spectrum and the filter spectrum. Note that the signal power is plotted on a logarithmic scale to capture the low-amplitude peaks at 0.28 and 0.40 pixels−1.