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Figure 4
Edge detection. (a) Original image (extracted drop from Fig. 2[link]). (b) Image after gradient calculation (see §[link]2.4.1). (c) All edges found after non-maximal suppression. (d) Edges found above threshold Thigh and extended if above Tlow.

Journal logoBIOLOGICAL
CRYSTALLOGRAPHY
ISSN: 1399-0047
Volume 58| Part 11| October 2002| Pages 1915-1923
doi:10.1107/S0907444902016840
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