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Figure 3
For the pixel I(x,y), we use its neighbouring pixels to compute the derivatives in the x and y directions.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 25| Part 2| March 2018| Pages 439-450
https://doi.org/10.1107/S1600577518000425
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