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This paper reports our work on contour line extraction from color images of scanned maps. Color processing extracts the basic colors of an image by switching from RGB to L*a*b color space, projecting the image on its principal axes and using modified histogram splitting. After the user has selected one of the extracted colors, pixel color classification yields a binary image that is thinned for connected-component analysis. Line extraction and merging follows, along with contour line formation based on connectability between the line segments.

Contour line extraction from color images of scanned maps