Euclidean distance mapping. Danielsson, P. Computer Graphics and image processing, 14(3):227-248, 1980.
bibtex   
@Article{Danielsson_1980_11744,
  author = {Danielsson, Per-Erik},
 journal = {Computer Graphics and image processing},
 number = {3},
 pages = {227-248},
 title = {Euclidean distance mapping},
 volume = {14},
 year = {1980},
 title_with_no_special_chars = {Euclidean distance mapping}
}

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