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一、效果一览

二、功能

用输入图像的阈值，提取平交路口（交通术语）——亚像素精度。
提取外轮廓。

三、算子实例

read_image (Image, 'double_circle')
dev_close_window ()
get_image_size (Image, Width, Height)
dev_open_window (0, 0, Width, Height, 'black', WindowHandle)
threshold_sub_pix (Image, Edges, 128)
segment_contours_xld (Edges, ContoursSplit, 'lines_circles', 5, 4, 3)
count_obj (ContoursSplit, Number)
dev_display (Image)
dev_set_draw ('margin')
dev_set_color ('red')
dev_update_window ('off')
for i := 1 to Number by 1select_obj (ContoursSplit, ObjectSelected, i)get_contour_global_attrib_xld (ObjectSelected, 'cont_approx', Attrib)if (Attrib > 0)fit_circle_contour_xld (ObjectSelected, 'ahuber', -1, 2, 0, 3, 2, Row, Column, Radius, StartPhi, EndPhi, PointOrder)gen_ellipse_contour_xld (ContEllipse, Row, Column, 0, Radius, Radius, 0, 4 * acos(0), 'positive', 1.0)dev_display (ContEllipse)endif
endfor