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Figure 1
Details of a single diffraction image (the same image contrast levels have been set) from the mortar data set showing the effect of the filtering procedure. (a) Original image; (b) `grains' signal; (c) `powder' signal; (d) simple threshold; (e) threshold + dilating cycles. The zoomed inset (bottom right) showing the saturated spot removal is greatly contrast enhanced to highlight the different features, especially the replacement of the saturated spot (indicated by the arrow) with values compatible with the `powder' diffraction signal underlying it.

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