References in periodicals archive ?
They are used to test the overall performance of the proposed algorithm in the treatment of thick lines and gaps, including gaps caused by interesting or overlapping of contour lines and other map elements (as shown in red circles 1-3 in Figure 8), conglutinations caused by densely arranged contour lines (as shown in red circles 4 and 5 in Figure 9 and red circles 7 and 8 in Figure 10), and gaps caused by nonuniform colors of contour lines (as shown in red circle 6 in Figure 9).