TY - JOUR
T1 - Contour Line Extraction from Paper-based Topographic Maps
AU - 
JO - Journal of Information and Computing Science
VL - 5
SP - 275
EP - 283
PY - 2006
DA - 2006/12
SN - 1
DO - http://doi.org/
UR - https://global-sci.org/intro/article_detail/jics/22827.html
KW - 
AB - Contour line is the main linear feature on topographic maps. Extraction of contour lines is tedious 
and &nbsp;time-consuming &nbsp;process, &nbsp;and &nbsp;is &nbsp;still &nbsp;an &nbsp;interesting &nbsp;problem. &nbsp;A &nbsp;novel &nbsp;method &nbsp;for &nbsp;extraction &nbsp;of &nbsp;contour 
lines from paper-based topographic maps is presented in this paper. In our approach, we firstly segment color 
topographic &nbsp;maps &nbsp;for &nbsp;achieving &nbsp;the &nbsp;binary &nbsp;image &nbsp;of &nbsp;brown &nbsp;color &nbsp;contour &nbsp;lines. &nbsp;Then, &nbsp;mathematic 
morphology method is used to filter the binary image. Next, Utilizing c-means algorithm to look for initial 
seed &nbsp;point &nbsp;on &nbsp;thinning &nbsp;contour &nbsp;lines. &nbsp;Fourthly, &nbsp;utilizing &nbsp;improved &nbsp;active &nbsp;contour &nbsp;model &nbsp;to &nbsp;extract &nbsp;non-
thinning &nbsp;contour &nbsp;lines. &nbsp;Last, &nbsp;we have &nbsp;analyzed &nbsp;the &nbsp;directional &nbsp;field &nbsp;of &nbsp;contour &nbsp;lines near the &nbsp;gap, &nbsp;and &nbsp;then 
reconnected &nbsp;broken &nbsp;contour lines. &nbsp;The performance &nbsp;of &nbsp;the algorithm &nbsp;is tested &nbsp;on &nbsp;several &nbsp;topographic maps 
and comparing with other algorithms.