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Figure 8
The variation in gradient angle taken over four pixel blocks is shown in (a) with darker pixels indicating lower values. In (b) the edge pixels for the coarse mask obtained from (a) are shown in grey with the object pixels in black.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 38| Part 3| May 2005| Pages 493-500
https://doi.org/10.1107/S0021889805007442
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