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Figure 8
Values of the crossing point between the FRC curves of Fig. 7[link] and the 1/2-bit threshold are shown here to indicate the achieved spatial resolution of the reconstructed image. The spatial resolution shown on the vertical axis is represented as the fraction of the Nyquist spatial frequency limit, or normalized spatial frequency [u^{{\prime}}] of equation (10)[link]. As one approaches the critical fluence of 360 photons pixel−1 as estimated using equation (7)[link], the FRC crossing from images obtained from the unencoded data approaches [u^{{\prime}}] = 1, meaning the achieved resolution is the pixel size of the image. Lossy compression schemes (a) and (b) produce no decrease in achieved resolution, while scheme (c) produces a noticeable decrease in resolution. As in Fig. 7[link], the results are shown for the FRC calculated from comparisons between two independent noisy datasets, or one noisy dataset against ground truth.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 28| Part 1| January 2021| Pages 292-300
https://doi.org/10.1107/S1600577520013326
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