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Figure 15
(a, b) By denoising warped rather than non-warped data, denoising performance is greatly improved. (c) An alternative approach is to collect XAS data on a grid where it appears stationary, and warping is no longer necessary. One example of data sampling is shown in (d) where the data acquisition follows uniform k-grid sampling before and after the absorption edge. While such sampling does not have physical meaning for the pre-edge region, it provides a way to densely sample sharp pre-edge peaks and then gradually reduce sampling density for the featureless pre-edge region. The V K-edge BiVO4 XAS spectrum was denoised using a Butterworth denoiser and an XAS warping function.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 33| Part 3| May 2026| Pages 658-682
https://doi.org/10.1107/S1600577526001712
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